Kub dip galvanizing yog ib qho ntawm cov khoom lag luam zoo tshaj plaws tsis pub dawb - kev tiv thaiv corrosion, thiab zoo li lwm cov txheej txheem tsim khoom, kub dip galvanized steel yuav tsum tau kuaj xyuas cov khoom tiav kom ua raws li cov qauv siv thiab cov lus qhia tshwj xeeb. Cov txheej txheem tshuaj xyuas yuav tsum muaj kev nkag siab meej txog cov kev xav tau tshwj xeeb thiab cov txheej txheem ntsuas kev ua raws li kev ntsuas kom raug. Ib qho tseem ceeb ntawm cov khoom kub-dip galvanized (HDG) yog durability, uas yields ntau xyoo ntawm kev txij nkawm-dawb kev ua tau zoo. Rau txhua qhov chaw, lub sijhawm ua ntej kev saib xyuas ntawm HDG steel yog ncaj qha proportional rau lub thickness ntawm zinc txheej.
Txheej thickness yog ib qho tseem ceeb uas yuav tsum tau muaj nyob rau hauv specification thiab kev ua tau zoo ntawm kub-dip galvanizing raws li kev tiv thaiv corrosion. Txawm li cas los xij, ntsuas txheej thickness tsuas yog ib qho ntawm ntau qhov kev xav tau hauv kev tshuaj xyuas. Kev tshuaj xyuas ntawm kub-dip galvanized steel yog yooj yim thiab ceev, thiab ob lub zog ntawm cov kub-dip galvanized txheej raug soj ntsuam zoo yog txheej tuab thiab txheej txheej. Muaj ntau yam yooj yim ntawm lub cev thiab kev kuaj sim yuav ua tau los txiav txim siab thickness, uniformity, adherence, thiab zoo li. Cov khoom yog galvanized raws li ntev tsim, txais, thiab pom zoo cov qauv ntawm ASTM, lub International Standards Organization (ISO), lub Canadian Standards Association (CSA), thiab lub American Association of State Highway thiab Transportation Officials (AASHTO). Cov qauv no npog txhua yam los ntawm qhov tsawg kawg nkaus txheej thicknesses yuav tsum tau rau ntau pawg ntawm galvanized khoom mus rau cov muaj pes tsawg leeg ntawm zinc hlau siv nyob rau hauv tus txheej txheem. Kev ntsuam xyuas cov txheej txheem thiab kev txhais cov txiaj ntsig tau suav nrog hauv kev tshaj tawm, Kev Tshuaj Xyuas Cov Khoom Kub-Dip Galvanized tom qab Fabrication, luam tawm los ntawm American Galvanizers Association (AGA).
Muaj ntau qhov kev soj ntsuam sib txawv uas tuaj yeem ua rau kub-dip galvanized steel. Feem ntau ntawm cov kev soj ntsuam no tshwm sim tam sim ntawd tom qab txheej txheej thiab tau txias rau ambient kub, ua ntej nws tawm ntawm qhov chaw galvanizing, los xyuas qhov yuav tsum tau ntawm cov specifications. Txawm li cas los xij, thaum lub kub-dip galvanized steel tau tsim thiab tom qab nws nyob hauv qhov chaw, kev tshuaj xyuas tsis tu ncua yog ib txwm muaj. Raws li koj txhua tus paub, qhov kev tshuaj xyuas zoo tshaj plaws hauv kev tshuaj xyuas ntawm kub dip galvanized steel yog cov txheej tuab. Cov kev qhia tshwj xeeb muab cov txheej txheem zinc txheej tsawg kawg nkaus rau cov chav kawm muab cov khoom siv thiab ntsuas steel thickness. Tus nqi ntawm cov txheej tuaj yeem raug teev los ntawm thickness lossis qhov hnyav ntawm ib cheeb tsam. Cov lus qhia tshwj xeeb suav nrog cov rooj muab cov kev xav tau tshwj xeeb rau cov tuab lossis qhov hnyav ntawm ib cheeb tsam raws li cov hlau ib feem thiab ntsuas steel thickness. Muaj ob txoj kev sib txawv yog siv los ntsuas cov txheej thickness ntawm kub-dip galvanized steel; magnetic thickness gauge thiab optical microscopy. Kev siv cov hlau nplaum tuab yog qhov tsis muaj kev puas tsuaj, tsuas yog txoj hauv kev los ntsuas txheej tuab. Muaj peb yam sib txawv ntawm magnetic thickness gauges raws li hauv qab no:
√ Pencil gauge, nws yog ib lub hnab tsho loj thiab siv lub caij nplooj ntoos hlav-loaded hlau nplaum nyob rau hauv ib lub thawv xaum Nws qhov tseeb yog nyob ntawm kev txawj ntawm cov neeg soj ntsuam, yog li kev ntsuas yuav tsum tau ua ntau zaus.
√Txiv tsawb gauge, nws tuaj yeem ntsuas txheej thickness nyob rau hauv txhua txoj hauj lwm, tsis muaj recalibration los yog cuam tshuam los ntawm lub ntiajteb txawj nqus.
√Lub ntsuas hluav taws xob lossis digital thickness ntsuas yog qhov tseeb tshaj plaws thiab siv tau yooj yim tshaj plaws, thiab nws tseem tuaj yeem khaws cov ntaub ntawv thiab ua qhov ntsuas nruab nrab.
Txhawm rau txiav txim siab lub hom phiaj ntawm galvanization zoo, qhov chaw saum npoo yog qhov tseem ceeb sib npaug li qhov tuab ntawm galvanization. Thaum kuaj xyuas qhov ua tiav ntawm qhov kub dip galvanized txheej, muaj ntau yam ntawm qhov chaw tuaj yeem pom. Ntau yam tuaj yeem cuam tshuam qhov ua tiav ntawm cov txheej galvanized - qee yam ntawm cov khoom no tuaj yeem tswj tau los ntawm galvanizer thaum lwm tus tsis tuaj yeem. Qhov tshwj xeeb yuav tsum tau ua kom tiav yog cov txheej yuav tsum du, sib xws, thiab txuas mus ntxiv. Muaj ntau yam kev txhais lus rau qhov uas txhais tau tias; Txawm li cas los xij, tus yuam sij rau seb qhov chaw saum npoo puas tau txais los yog tsis cuam tshuam rau nws cov txiaj ntsig ntawm kev ua haujlwm ntev corrosion. Yog hais tias qhov chaw saum npoo yuav tsis txo qis rau lub sij hawm ntev corrosion ntawm cov khoom, nws yog tsim nyog. Ntawm qhov tod tes, yog tias qhov xwm txheej cuam tshuam lub neej ntawm txheej txheej, nws yog qhov ua rau tsis lees paub. Yog tias qhov kub-dip galvanized steel ib feem tau raug tsis lees paub rau lwm yam uas tsis yog embrittlement, ib feem yuav raug kho thiab / lossis regalvanized thiab xa rov qab rau kev tshuaj xyuas. Yog tias thaj chaw tsis ua raws li qhov yuav tsum tau kho, ib feem tuaj yeem raug stripped thiab regalvanized thiab rov kuaj dua. Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov galvanizing tsis hloov cov khoom siv ntawm cov hlau, yog li tsis muaj kev txhawj xeeb ntxiv nrog stripping thiab regalvanizing ib feem. Cov hauv qab no yog kev tshuaj xyuas ntawm cov xwm txheej saum npoo uas tuaj yeem tshwm sim tom qab galvanizing, suav nrog cov ntsiab lus ntawm qhov ua rau ntawm qhov xwm txheej thiab seb nws puas tau txais lossis tsis lees paub raws li cov lus qhia tshwj xeeb.
√ Cov chaw tsis muaj coated
Uncoated me ntsis, tseem hu ua liab qab me ntsis, yog ib tug defect uas yuav tshwm sim vim hais tias ntawm kev npaj deg tsis txaus. Cov pob liab liab tuaj yeem tshwm sim los ntawm vuam slag, xuab zeb embedded nyob rau hauv castings, ntau tshaj txhuas nyob rau hauv lub galvanizing kettle, los yog lifting pab kiag li lawm uas tiv thaiv lub txheej los ntawm tsim nyob rau hauv ib tug me me cheeb tsam. Txhawm rau kom tsis txhob muaj qhov liab qab, lub galvanizer yuav tsum xyuas kom meej qhov chaw huv si thiab tsis muaj xeb tom qab pretreatment. Cov me me liab qab tuaj yeem kho tau hauv khw galvanizing. Yog tias qhov luaj li cas ntawm qhov chaw liab qab lossis tag nrho cov chaw ua rau tsis lees paub, cov khoom yuav raug stripped, regalvanized, thiab tom qab ntawd rov kuaj xyuas kom ua raws li cov lus qhia tshwj xeeb.
√ Kev puas tsuaj tawg
Blistered los yog flaking qhov chaw ntawm qhov chaw ntawm cov khoom galvanized tuaj yeem tshwm sim vim kev puas tsuaj ua ntej tha xim ntawm cov hlau galvanized. Nws yog tshwm sim los ntawm cov txheej txheem abrasive blasting tsis raug tsim kom tawg thiab delamination ntawm cov txheej txheej hlau hauv zinc txheej. Kev puas tsuaj tawg tuaj yeem zam tau thaum ua tib zoo them nyiaj rau kev npaj cov khoom rau pleev xim lossis hmoov txheej. Tsis tas li ntawd, blast siab yuav tsum tau txo qis heev raws li ASTM D6386 Xyaum rau Kev Npaj Zinc (Kub Dip Galvanized) Coated Hlau thiab Hlau Cov Khoom thiab Cov Khoom Siv Nto rau Xim.
√ Cov cim kos
Cov cim dai, tseem hu ua saw & hlau cov cim, lawv yog lwm hom kev tsis xws luag uas tshwm sim thaum steel pars raug tshem tawm thiab thauj siv cov saw hlau thiab cov xov hlau txuas nrog nyiaj siv ua haujlwm cranes. Cov cuab yeej nqa tuaj yeem tawm hauv qhov chaw tsis muaj coated ntawm cov khoom tiav uas yuav tsum tau kho dua tshiab. Cov cim saum toj kawg nkaus sab laug ntawm cov txheej galvanized los ntawm cov khoom nqa nqa tsis yog lub hauv paus rau kev tsis lees paub tshwj tsis yog cov qhab nia nthuav tawm cov hlau liab qab; Nyob rau hauv xws li ib tug teeb meem, galvanizer yuav tsum tau kho qhov liab qab qhov chaw ua ntej ib feem yog txais. Ib txoj hauv kev uas yuav zam tau cov cim no yog tsim cov ntsiab lus mus tas li lossis ib ntus nqa cov ntsiab lus hauv kev tsim.
√ Clogged Qhov & Xov
Cov qhov txhaws yog tshwm sim los ntawm molten zinc hlau tsis ntws dej txaus thiab ib nrab los yog tag nrho txhaws qhov nrog zinc. Molten zinc yuav tsis ntws yooj yim los ntawm qhov tsawg dua 3 hli nyob rau hauv txoj kab uas hla vim lub viscosity ntawm zinc hlau. Clogged qhov tuaj yeem txo qis los ntawm kev ua kom txhua qhov loj li sai tau; Txawm li cas los xij, clogged qhov tsawg dua 1/2 "(12.7mm) hauv txoj kab uas hla tsis yog qhov ua rau tsis lees paub, tshwj tsis yog tias nws tiv thaiv ib feem los ntawm kev siv rau nws lub hom phiaj. Clogged threads yog tshwm sim los ntawm cov dej tsis zoo ntawm cov threaded seem tom qab cov khoom. Tshem tawm ntawm lub qhov hluav taws xob galvanizing, cov xov clogged tuaj yeem raug ntxuav los ntawm kev siv tom qab-galvanizing tu kev ua haujlwm xws li lub centrifuge lossis los ntawm cua sov nrog lub teeb rau kwv yees li 500 F (260 C) thiab tom qab ntawd txhuam lawv nrog txhuam txhuam kom tshem tawm cov Cov zinc ntau dhau yuav tsum tau ntxuav thiab tsis muaj zinc ntau dhau ua ntej qhov yuav ua tau raws li qhov tshwj xeeb.
√ Delamination & Peeling
Delamination los yog peeling tsim ib txheej ntxhib ntawm cov hlau uas zinc tau tawm. Muaj ntau qhov laj thawj rau zinc tev. Ntau qhov tuab galvanized siv sijhawm ntev kom txias hauv huab cua thiab txuas ntxiv tsim cov zinc-hlau txheej tom qab lawv tau raug tshem tawm ntawm lub galvanizing kettle. Qhov no txuas ntxiv txheej tsim tawm tom qab qhov khoob ntawm ob txheej txheej saum toj kawg nkaus ntawm galvanized txheej. Yog tias muaj ntau qhov voids tsim, txheej txheej saum toj kawg nkaus ntawm zinc tuaj yeem cais tawm ntawm cov txheej txheej thiab tev tawm ntawm ib feem. Yog tias qhov seem txheej tseem ua tau raws li qhov yuav tsum tau ua kom tsawg kawg nkaus, ces qhov yuav tsum tau ua. Yog hais tias cov txheej uas tseem tshuav ntawm cov hlau tsis tau raws li qhov yuav tsum tau ua kom tsawg kawg nkaus, ces qhov yuav tsum tau muab pov tseg thiab regalvanized. Yog hais tias delamination tshwm sim los ntawm fabrication tom qab galvanizing, xws li blasting ua ntej painting, lub galvanizer tsis yog lub luag hauj lwm rau ib feem txais.
√ Distortion
Distortion, tseem hu ua warpage, feem ntau tshwm sim los ntawm cov thermal hloov steel qhov chaw los yog cov rooj sib txoos ntsib thaum lub sij hawm kub dip galvanizing txheej txheem. Steel qhov chaw los yog cov rooj sib txoos yog raug rau warpage thiab distortion los ntawm residual kev nyuaj siab nyob rau hauv ib feem ntawm fabrication los yog los ntawm asymmetrical designs. Qhov no tseem tuaj yeem tshwm sim rau cov qauv tsim uas sib xyaw cov hlau tuab thiab nyias ua ke rau hauv kev sib dhos asymmetrical. Cov seem thinner ncav cuag zinc da dej kub sai sai thiab nthuav dav thaum lub thickness ntawm lub rooj sib txoos ua rau kom qhov kub thiab txias maj mam tiv thaiv cov thinner qhov chaw los ntawm kev nthuav dav, ua rau muaj kev ntxhov siab loj hauv kev sib dhos. Kev xyaum zoo tshaj plaws kom tsis txhob muaj kev sib ntaus sib tua thiab kev tsis sib haum xeeb dictates fabricating qhov zoo sib xws steel thickness thiab / los yog ib ntus bracing. Ntau yam khoom tsis sib haum tuaj yeem tsim tau manually los yog nteg tiaj tus tom qab galvanizing coj qhov chaw mus rau qhov kev lees paub zaum kawg.
√ Cov dej ntws tawm
Cov dej ntws tawm los yog cov drips yog teardrops ntawm zinc raws cov npoo ntawm cov khoom. Cov no yog tshwm sim thaum cov khoom hlau raug tshem tawm ntawm lub galvanizing kettle, thiab zinc tsis ntws rov qab mus rau hauv lub hwj. Cov dej ntws tawm feem ntau raug tshem tawm thaum lub sijhawm tshuaj xyuas los ntawm kev sib tsoo lossis kev sib tsoo. Muaj cov zinc ntau dhau, cov dej ntws tawm thiab cov drips yuav tsis cuam tshuam rau kev tiv thaiv corrosion, tab sis muaj peev xwm txaus ntshai rau txhua tus neeg ua haujlwm. Yog li ntawd, cov spikes no yuav tsum tau muab tshem tawm ua ntej qhov tuaj yeem lees txais.
√ Dross Pimples
Dross pimples, tseem hu ua dross inclusions, yog ib qho sib txawv ntawm zinc-hlau intermetallic alloy uas tuaj yeem nkag los yog nkag mus rau hauv zinc txheej. Dross inclusions tej zaum yuav zam tau los ntawm kev hloov lub lifting orientation lossis redesigning cov khoom kom tso cai rau cov kua dej zoo dua. Yog hais tias cov khoom tawg yog me me thiab ua tiav los ntawm zinc hlau, lawv yuav tsis cuam tshuam rau kev tiv thaiv corrosion; thiab yog li no, tau txais. Yog hais tias muaj tag nrho cov dross hais (loj inclusions) uas tiv thaiv tag nrho cov galvanized txheej los ntawm kev tsim ntawm cov hlau, ces cov hais yuav tsum tau muab tshem tawm thiab lub cheeb tsam kho.
√ Tshaj Aluminium
Galvanizers yuav tsum tau da dej ntawm 98 feem pua ntawm zinc ntshiab, raws li cov khoom specifications ASTM A123, A153, thiab A767, thaum seem 2 feem pua yog muaj cov additives ntawm galvanizer qhov kev txiav txim siab. Ib qho ntxiv yog aluminium, uas txhim kho qhov zoo nkauj ntawm txheej. Thaum ntau tshaj txhuas nyob rau hauv lub da dej galvanizing, nws tuaj yeem tsim cov cim dub lossis liab qab ntawm cov hlau, uas tuaj yeem pom tam sim ntawd thaum tshem tawm ntawm da dej. Cov pob liab liab vim muaj ntau dhau ntawm txhuas hauv chav da dej tuaj yeem kho yog tias tsuas yog thaj chaw me me xwb; Txawm li cas los xij, yog tias qhov xwm txheej no tshwm sim dhau ib feem ntawm lub ntsiab lus, nws yuav tsum raug tsis lees paub, stripped, thiab regalvanized.
√ Ua pa
Flaking feem ntau ua rau cov txheej tuab (12 mils lossis ntau dua) txhim kho thaum lub sijhawm txheej txheem galvanizing,. Cov txheej tuab tuab heev ua rau muaj kev ntxhov siab ntawm qhov sib cuam tshuam ntawm zinc & hlau intermetallic txheej uas ua rau cov zinc txheej ua flaky thiab cais tawm ntawm cov hlau. Flaking tuaj yeem zam tau los ntawm kev txo qis lub sijhawm immersion nyob rau hauv lub galvanizing kettle thiab txias ntawm galvanized steel qhov chaw kom sai li sai tau, thiab / los yog yog hais tias ua tau siv ib tug txawv steel qib. Yog tias thaj tsam ntawm flaking me me, nws tuaj yeem kho tau thiab tom qab ntawd txais; Txawm li cas los xij, yog tias qhov chaw flaking loj dua qhov kev tso cai los ntawm cov lus qhia tshwj xeeb, qhov yuav tsum tau tsis lees paub thiab regalvanized.
√ Flux suav nrog
Flux inclusions yog tsim los ntawm qhov tsis ua hauj lwm ntawm cov flux tso tawm thaum lub sij hawm kub dip galvanizing txheej txheem, tiv thaiv lub txheej los ntawm kev sib sau. Vim tias tsis muaj txheej txheej loj hlob raws li kev suav nrog, thaj chaw yuav tsum tau kho ua ntej kev lees txais. Yog tias thaj chaw me me, nws tuaj yeem raug ntxuav thiab kho nrog qhov kov, tab sis yog tias cov flux suav nrog thaj tsam loj, ib feem yuav tsum tsis lees paub. Flux deposits nyob rau sab hauv ntawm ib tug hollow ib feem, xws li cov yeeb nkab los yog lub raj tsis tuaj yeem kho thiab yog li yuav tsum tau tsis lees paub. Cov khoom tsis lees paub rau cov nyiaj tso tawm tuaj yeem raug tshem tawm ntawm lawv cov zinc txheej thiab tom qab ntawd regalvanized los muab cov txheej txheem tsim nyog. Qee tus neeg yuav tau txais kev tsis sib haum xeeb nrog cov zinc skimming, zinc skimming, tsis zoo li cov flux, yuav tsis muaj kev cuam tshuam rau kev pabcuam ntawm cov khoom. ASTM A 123 hais tias "Cov khoom siv Galvanized yuav tsum tsis pub dawb los ntawm qhov chaw tsis muaj coated, hlwv pob, flux deposits, thiab dross inclusions. tsis raug tso cai". Yog li zinc skimming uas tsis cuam tshuam rau cov tsos ntawm cov khoom tiav lossis tsis cuam tshuam nrog cov khoom ua haujlwm tsis ua rau tsis lees paub.
√ Oxide kab
Oxide kab yog lub teeb xim zaj duab xis kab ntawm cov galvanized steel nto tsim thaum ib yam khoom tsis raug tshem tawm los ntawm galvanizing kettle ntawm tus nqi sib xws, thiab qhov tsis sib xws ntawm kev tshem tawm tuaj yeem yog vim cov khoom zoo lossis cov dej ntws. Oxide kab yuav ploj mus dhau lub sijhawm raws li tag nrho cov huab cua ntawm zinc (oxidizes). nruj me ntsis kev zoo nkauj, oxide kab tsis cuam tshuam rau kev ua haujlwm corrosion; thiab yog li ntawd, tsis yog qhov ua rau tsis lees txais cov khoom kub dip galvanized.
√ Kov cov cim
Kov cov cim feem ntau tshwm sim los ntawm ob qhov chaw galvanized los ntawm kev sib cuag nrog ib leeg lossis raug daig ua ke thaum lub sijhawm txheej txheem galvanizing. Qhov no tuaj yeem tshwm sim thaum ntau cov khoom me me tau dai rau ntawm tib lub teeb, tsim kom muaj cov khoom lag luam tuaj yeem txuas nrog lossis sib tshooj thaum lub sijhawm txheej txheem galvanizing. Lub galvanizer yog lub luag haujlwm rau kev tuav tag nrho cov khoom steel kom tsis txhob muaj qhov tsis xws luag ntawm cov khoom hauv kev sib cuag. Ib yam zoo sib xws ntawm qhov chaw tsis xws luag, kov cov cim raug puas los yog tsis muaj qhov chaw ntawm cov khoom siv los ntawm cov khoom siv galvanized so ntawm ib leeg lossis los ntawm cov khoom siv tuav cov khoom siv thaum lub sijhawm ua haujlwm galvanizing. Kov cov cim yuav ua rau tsis lees paub, tab sis tuaj yeem kho yog tias lawv qhov loj me raws li qhov yuav tsum tau ua rau thaj chaw kho.
√ Rough Surface
Rough deg tej yam kev mob los yog zoo li yog ib tug uniformly textured tsos ntawm tag nrho cov khoom, thiab ua rau cov ntxhib saum npoo yuav ua tau cov hlau chemistry los yog kev npaj ntawm lub nto los ntawm mechanical tu, xws li blasting ua ntej ib feem mus txog lub galvanizer. Rough deg mob tuaj yeem muaj txiaj ntsig zoo rau kev ua haujlwm corrosion vim tias cov zinc txheej tuab yog tsim; thiab yog li ntawd, cov coatings ntxhib feem ntau tsis ua rau kev tsis lees paub. Txawm li cas los xij, ib qho ntawm ob peb qhov xwm txheej uas cov txheej txheej ntxhib yog ua rau kev tsis lees paub yog nyob ntawm tes, vim nws cuam tshuam rau kev siv cov khoom thiab yuav tsum tau smoothed ua ntej siv.
√ khiav
Khiav yog thaj chaw tuab ntawm zinc ntawm qhov chaw uas tshwm sim thaum zinc khov rau ntawm cov khoom thaum tshem tawm ntawm zinc da dej. Kev khiav tsis yog ua rau kev tsis lees paub tshwj tsis yog tias lawv cuam tshuam rau kev npaj siv ntawm cov hlau. Yog tias kev khiav tsis tuaj yeem raug zam los ntawm kev tsim cov khoom, tab sis yuav cuam tshuam rau daim ntawv thov, lawv tuaj yeem raug buffed.
√ Los ntshav
Cov xeb los ntshav tshwm raws li xim av lossis xim liab uas tawm los ntawm cov pob qij txha uas tsis tau kaw tom qab cov khoom tau kub dip galvanized. Nws yog tshwm sim los ntawm cov tshuaj ua ntej kev kho mob uas nkag mus rau ib qho kev sib koom ua ke uas tsis muaj kev sib khi. Thaum lub sij hawm galvanizing ntawm cov khoom, noo noo boils tawm cov cuab yeej kho mob tawm cov anhydrous crystal residues nyob rau hauv lub sib koom tes. Nyob rau tib lub sijhawm, cov khoom siv lead ua no nqus dej los ntawm qhov chaw thiab tawm tsam cov hlau ntawm ob qho tib si ntawm qhov sib koom ua ke, tsim cov xeb uas tawm ntawm qhov sib koom ua ke. Cov xeb los ntshav tuaj yeem zam tau los ntawm kev sib khi vuam qhov sib koom ua ke yog qhov ua tau lossis tawm qhov sib txawv ntau dua 3/32 "(2.4mm) dav txhawm rau tso cai rau kev daws kom dim thiab zinc nkag mus rau lub sijhawm kub dip galvanizing. yuav tsum tau ntxuav los ntawm kev ntxuav cov pob qij txha tom qab cov muaju yog hydrolyzed, los ntshav los ntawm cov pob qij txha uas tsis muaj kev sib khi tsis yog lub luag haujlwm ntawm cov galvanizer thiab tsis yog ua rau tsis lees paub.
√ Xuab zeb los yog av nyob rau hauv Castings
Cov xuab zeb los yog av suav nrog qhov tsis xws luag tshwm sim thaum cov xuab zeb nkag mus rau hauv castings thiab tsim cov pob liab qab ntawm qhov chaw ntawm cov hlau galvanized. Sand inclusions tsis raug tshem tawm los ntawm cov pa acid pickling; Yog li ntawd, abrasive tu yuav tsum tau ua ua ntej cov khoom raug xa mus rau galvanizer. Vim tias qhov tsis xws luag no tawm ntawm cov pob liab qab, nws yuav tsum tau muab ntxuav thiab kho, lossis ib feem yuav tsum tau muab pov tseg, stripped, thiab regalvanized.
√ Kev sib tw
Striations yog tus cwj pwm los ntawm qhov sib npaug ntawm cov ridges hauv cov txheej txheem galvanized, uas tuaj yeem tshwm sim los ntawm cov tshuaj muaj pes tsawg leeg ntawm cov hlau. Striations muaj feem xyuam rau hom hlau uas tau galvanized, thiab thaum lub ntsej muag raug cuam tshuam, kev ua haujlwm ntawm kev tiv thaiv corrosion tsis yog; yog li ntawd, strations tau txais. Ntses-boning, zoo ib yam li striations, yog ib qho txawv txawv ntawm tag nrho cov saum npoo ntawm cov hlau, uas yog tshwm sim los ntawm qhov sib txawv ntawm qhov chaw chemistry ntawm ib tug loj txoj kab uas hla steel daim thiab variations nyob rau hauv cov tshuaj tiv thaiv tus nqi ntawm cov hlau thiab molten zinc. Cov txheej txheem saum npoo no tsis cuam tshuam rau kev tiv thaiv corrosion thiab tau txais.
√ Cov kab mob sib kis
Cov kab mob ntawm cov hlau tsis raug tshem tawm los ntawm pretreatment yuav tsim ib qho chaw ungalvanized qhov chaw uas cov kab mob nyob hauv keeb kwm. Xim, roj, siv quav ciab, lacquer, lossis lwm yam khoom siv tshuaj tua kab mob tsis tuaj yeem tshem tawm qhov no; Yog li, cov pa paug saum npoo yuav tsum tau muab tshem tawm los ntawm mechanically ua ntej txheej txheem galvanizing. Yog tias lawv ua rau thaj chaw liab qab ntawm cov khoom kawg, lawv yuav tsum tau kho. Yog tias thaj chaw ua tau raws li qhov loj me hauv qhov kev qhia tshwj xeeb, nws yuav raug kho; Txawm li cas los xij, yog tias thaj chaw loj dhau, qhov yuav tsum tau tsis lees paub thiab rov ua dua tshiab.
√ Weeping Weld
Weeping welds stain lub zinc nto ntawm welded kev sib txuas ntawm cov hlau. Ua los ntawm cov txheej txheem ntxuav uas nkag mus rau qhov chaw nruab nrab ntawm ob daim, weeping welds tuaj yeem zam tau los ntawm kev muab 3/32 "(2.4mm) lossis qhov sib txawv loj ntawm ob daim ntawv thaum vuam lawv, qhov no yuav ua rau cov zinc nkag mus rau qhov sib txawv. Tom qab ntawd lub vuam yuav tsum tau ua nrog qhov khoob es tsis txhob siv cov hlaws txuas txuas ntxiv, ua kom muaj kev sib koom ua ke zoo dua thaum cov txheej txheem tiav. Weeping welds tsis yog lub luag haujlwm ntawm cov galvanizer thiab tsis ua rau tsis lees paub.
√ Vuam tshuab tshuab
Vuam blowout yog ib qho chaw liab qab nyob ib ncig ntawm ib qho weld lossis overlapping nto qhov tshwm sim los ntawm kev kho cov kua dej ua ntej nkag mus rau qhov chaw kaw thiab sib tshooj uas kub tawm thaum lub sij hawm raus hauv cov zinc molten. Blowouts ua rau thaj chaw muaj kab mob thiab tiv thaiv cov galvanized txheej los ntawm kev sib sau. Txhawm rau kom tsis txhob welding blowouts, xyuas qhov chaw weld kom tiav welds kom paub tseeb tias tsis muaj dej nkag. Tsis tas li ntawd, cov khoom tuaj yeem raug preheated ua ntej immersion rau hauv lub galvanizing kettle kom qhuav tawm qhov sib tshooj ntau li ntau tau. Cov cheeb tsam liab qab tshwm sim los ntawm kev vuam tshuab yuav tsum tau kho ua ntej qhov kev lees txais.
√ Vuam Spatter
Vuam spatter tshwm raws li cov pob hauv cov galvanized txheej nyob ib sab ntawm qhov chaw weld vim spatter sab laug rau ntawm qhov chaw los ntawm fabrication. Txhawm rau kom tsis txhob muaj qhov liab qab nyob rau hauv txheej txheej, vuam seem yuav tsum tau muab tshem tawm ua ntej kub-dip galvanizing. Vuam spatter zoo li yuav tsum tau them los ntawm zinc txheej, tab sis lub txheej tsis ua raws li qhov zoo thiab tuaj yeem tshem tau yooj yim, tawm hauv qhov chaw tsis muaj coated los yog liab qab. Yog tias qhov teeb meem no tshwm sim, thaj chaw yuav tsum tau ntxuav thiab kho kom zoo, uas yuav tsum tau regalvanizing.
√ Dawb xeb
Dawb xeb, tseem hu ua ntub cia stain los yog dawb cia stain, yog ib tug dawb, powdery deg deposits ntawm freshly galvanized nto. Kev ntub dej khib nyiab yog tshwm sim los ntawm qhov chaw tshiab galvanized tau npog los ntawm cov dej noo, xws li los nag, dej lwg, los yog condensation, thiab tsis muaj cua ntws los ntawm qhov chaw. Dej reacts nrog zinc hlau nyob rau saum npoo los tsim zinc oxide thiab zinc hydroxide. Kev ntub dej stain feem ntau pom nyob rau ntawm cov khoom sib dhos thiab cov khoom sib dhos, xws li cov nplooj ntawv galvanized, daim hlau, cov ces kaum, thiab cov tuav. Nws tuaj yeem muaj qhov pom ntawm lub teeb, nruab nrab, lossis hnyav dawb hmoov ntawm cov khoom siv hlau galvanized. Ib txoj hauv kev kom tsis txhob ntub cov stains yog kom passivate cov khoom tom qab galvanizing los ntawm kev siv quench tov. Lwm qhov kev ceev faj yog kom tsis txhob muab cov khoom tso rau hauv qhov cua tsis zoo, ntub dej. Lub teeb los yog nruab nrab ntub cia stain yuav huab cua nyob rau lub sijhawm hauv kev pabcuam thiab ua tau. Feem ntau, cov ntaub ntub dej ntub dej tsis qhia qhov kev puas tsuaj loj ntawm cov zinc txheej, thiab nws tsis tas yuav ua rau muaj kev txo qis hauv lub neej ntawm cov khoom; Txawm li cas los xij, cov ntaub ntub dej hnyav yuav tsum tau muab tshem tawm los yog siv cov tshuaj kho mob tsim nyog ua ntej qhov galvanized muab tso rau hauv kev pabcuam. Hnyav ntub cia stain yuav tsum tau muab tshem tawm, los yog ib feem yuav tsum tau muab pov tseg thiab regalvanized. Lub galvanizer yog lub luag haujlwm rau kev ua raws li cov kev coj ua zoo tshaj plaws kom tsis txhob ntub cov stains ntawm qhov chaw khaws cia ntawm qhov chaw galvanizing. Thaum cov kev coj ua zoo tshaj plaws no tau ua raws, cov galvanizer tsis muaj lub luag haujlwm rau cov ntaub ntub dej uas tsim los ntawm nws qhov chaw, thaum lub sijhawm thauj mus los, lossis khaws cia ntawm qhov chaw ua haujlwm ua ntej siv.
√ Zinc Skimmings
Oxidized zinc nyob rau hauv da dej nto, zinc skimming deposits, feem ntau yog tshwm sim thaum tsis muaj kev nkag mus rau tshem tawm cov zinc skimmings thaum lub sij hawm tshem ntawm cov hlau los ntawm lub galvanizing kettle. Zinc skimmings ntawm molten zinc nto yog ces dai rau ntawm zinc txheej. Zinc skimming deposits tsis yog lub hauv paus rau kev tsis lees txais yog tias cov zinc txheej hauv qab tsis raug mob thaum lawv tshem tawm thiab nws ua tau raws li qhov tsim nyog.
√ Zinc Splatters
Zinc splatters txhais tau tias yog splashes thiab flakes ntawm zinc uas loosely adhere rau galvanized txheej nto. Zinc splatter yog tsim thaum ya raws ntawm qhov chaw ntawm lub galvanizing kettle ua rau molten zinc rau "pop" thiab txaws tee rau ntawm cov khoom. Cov splashes tsim flakes ntawm zinc loosely adherent rau galvanized nto. Zinc splatter yuav tsis cuam tshuam rau kev ua haujlwm corrosion ntawm zinc txheej thiab yog li tsis ua rau tsis lees paub. Lub splatter tsis tas yuav tsum tau ntxuav tawm ntawm zinc txheej txheej, tab sis tuaj yeem ua tau yog tias yuav tsum muaj cov txheej txheem zoo sib xws.
√ Discoloration
Ib qho ntawm cov laj thawj tseem ceeb rau galvanization discoloration yog qhov kev hloov pauv hauv steel chemistry uas yuav tshwm sim thoob plaws hauv cov khoom saum npoo. Qhov tseem ceeb tshaj plaws hauv qhov kev hwm no yog cov ntsiab lus silicon ntawm cov hlau, vim qhov no cuam tshuam rau cov hlau reactivity thaum nws dipped rau hauv zinc molten. Txawm li cas los xij, yog tias cov hlau muaj cov ntsiab lus silicon siab nws yuav ua rau muaj kev cuam tshuam txaus uas cov tshuaj tiv thaiv ntawm cov hlau thiab zinc tuaj yeem txuas ntxiv txawm tias tom qab tshem tawm ntawm da dej galvanizing. Hauv qhov no, txheej txheej ntawm cov zinc ntshiab tuaj yeem hloov pauv ib nrab lossis tag nrho rau zinc-hlau alloy, uas yog pom ntawm cov txheej txheej saum npoo zoo li duller tsaus grey hauv qhov tsos. Raws li qhov tshwm sim, cov hlau silicon siab ntau dua yuav tsim cov txheej grey dull thaum qhov sib txawv ntawm cov ntsiab lus ntawm silicon tuaj yeem ua rau muaj qhov ua kom tiav, nrog rau qhov kaj thiab npub los yog cov qauv ntawm cov cellular tsaus nyob rau hauv lwm yam silvery grey txheej. Cov txheej txheem zoo li no feem ntau (tab sis tsis yog tshwj xeeb) pom nyob rau ntawm qhov hnyav dua steel ua haujlwm uas txias qeeb dua, cov cua sov uas khaws cia ua lub zog tsav rau kev hloov pauv ntawm zinc rau zinc-hlau alloy. Tsis tas li ntawd, ib qho xim galvanized txheej yuav tsim nyob rau hauv lub zos qhov twg steelwork tau welded mus rau lub opposite lub ntsej muag thiaj li ua rau steels seem thickness thiab ua rau cov cua sov tom qab lub dipping txheej txheem. Ib qho piv txwv ntawm qhov no yog daim duab plaub welded rau ib sab ntawm lub vev xaib. Qhov no tuaj yeem ua rau cov txheej txheem ntawm lwm lub ntsej muag ntawm lub vev xaib ncaj qha tawm ntawm cov phaj welded ua qhov tsaus ntuj.
√ Tshaj-sib tsoo / Sanding
Tnws tsis cuam tshuam nrog cov txheej txheem galvanizing nws tus kheej, tab sis nws yog ib qho yuam kev heev uas ntau cov galvanizers yuav ua tau thaum lawv cov neeg ua haujlwm sim tshem cov pob ntxau los yog cov kua dej tawm. Tus neeg teb xov tooj yuav xaiv hluav taws xob sander uas muaj txiaj ntsig zoo dua li cov cuab yeej siv xuab zeb, tab sis nws tuaj yeem yooj yim xuab zeb tawm ntawm zinc txheej yog tias tus neeg teb xov tooj tsis ua tib zoo ua cov xuab zeb ua haujlwm. Qhov chaw xuab zeb yuav tsis pom cov cim ntawm xeb hauv ob lossis peb hnub tom ntej, tab sis nws yuav pib pom cov cim ntawm xeb nyob ib ncig ntawm 7 mus rau 10 hnub. Qhov chaw tshaj xuab zeb no dhau los ua qhov chaw liab qab uas yuav tsum tau kho qhov kov.
Ntxiv nrog rau kev ntsuas txheej thiab kev tshuaj xyuas qhov pom ntawm qhov pom thiab ua tiav, muaj ob peb lwm yam kev sim uas yuav ua rau kub-dip galvanized steel. Cov kev ntsuam xyuas hauv qab no feem ntau ua tiav thaum koj muaj lus nug lossis kev txhawj xeeb txog qhov zoo ntawm galvanization.
√ Kev soj ntsuam kev ua raws, kev sim zinc txheej ua raws li kev ua tiav yog tiav siv rab riam thiab ua haujlwm zoo ntawm cov hlau tsis muaj whittling thiab gouging, raws li tau piav qhia hauv ASTM specifications A123 / A123M thiab A153 / A153M.
√ Kev sim embrittlement, thaum muaj kev xav tias muaj peev xwm embrittlement ntawm ib yam khoom, nws yuav tsum tau kuaj ib pab pawg me ntawm cov khoom los ntsuas cov ductility raws li cov txheej txheem hauv specification A143 / A143M Xyaum rau Kev Tiv Thaiv Tiv Thaiv Tawm tsam Kub Dip Galvanized Steel Structure. Cov khoom thiab txheej txheem rau kev kuaj Embkev rittlement.
√ Bending test rau cov hlau reinforcing, kub dip galvanized txheej ntawm lub steel reinforcing bar yuav tsum tiv thaiv dabtsi yog khoov yam tsis muaj flaking los yog tev tawm thaum lub bending xeem yog ua raws li cov txheej txheem nyob rau hauv A143 / A143M. Rebar feem ntau yog khoov txias ua ntej kub-dip galvanizing txheej txheem. Thaum khoov ua ntej galvanizing lub fabricated khoov txoj kab uas hla yuav tsum sib npaug zos rau los yog ntau tshaj tus nqi teev nyob rau hauv A767 / A767M.
√ Kev xeem Passivation, qhov tshwj xeeb los txiav txim siab muaj chromate ntawm zinc nto yog ASTM B201. Qhov kev ntsuam xyuas no suav nrog kev tso cov tee ntawm cov tshuaj acetate rau ntawm qhov chaw ntawm cov khoom, tos tsib vib nas this, thiab tom qab ntawd maj mam txhuam nws. Yog hais tias qhov kev daws teeb meem no tsim ib qho kev tso nyiaj tsaus lossis cov xim dub, muaj cov zinc uas tsis muaj kev cuam tshuam. Cov txiaj ntsig pom tseeb qhia tau tias muaj cov txheej txheem passivation.
Kev soj ntsuam pom pom feem ntau suav nrog cov hauv qab no:
√ Crevices,thaum corrosive ntsiab xws li dej nkag crevices, lub txwv huab cua ntws tuaj yeem tsim qhov sib txawv hauv kev tsim muaj peev xwm anodic thiab cathodic thaj chaw uas tuaj yeem ua rau corrosion. Ib txhia cov cheeb tsam uas muaj xws li: thaj chaw sib tshooj, ntu sib txuas nruab nrab ntawm fasteners, thiab cov cheeb tsam uas cov galvanized txheej yog butted mus rau lwm qhov chaw xws li ntoo, pob zeb, los yog asphalt. Thaum ua tau, crevices yuav tsum tau zam thaum lub sij hawm txheej txheem tsim.
√ Cov hlau tsis sib xws hauv kev sib cuag, thaum cov hlau tsis sib xws nyob rau hauv kev sib cuag, galvanic corrosion tuaj yeem tshwm sim. Zinc, uas muaj cov txheej txheem galvanized, yog siab ntawm Galvanic Series ntawm Hlau; thiab yog li ntawd, yuav nyiam corrode rau yuav luag txhua yam hlau uas nws nyob rau hauv kev sib cuag. Thaum ua tau, tiv thaiv cov hlau tsis sib xws ntawm kev sib cuag yuav tsum tau hais thaum lub sijhawm tsim qauv. Hluav taws xob cais cov hlau tsis sib xws ntawm ib qho
lwm qhov nres galvanic corrosion thiab tuaj yeem ua tiav los ntawm kev siv cov yas lossis roj hmab grommets ntawm cov hlau tsis sib xws lossis los ntawm kev pleev xim rau cathode. Thaum thaj tsam ntawm lub cathode loj dua qhov anode, galvanic corrosion tuaj yeem siv cov khoom siv anodic sai sai.
√ Cov cheeb tsam uas cov pas dej da dej, thaj chaw tiaj tus tuaj yeem sau cov dej thiab lwm yam corrosive thiab tuaj yeem muaj corrosion ntau dua li qhov chaw ntsug. Pom pom kev soj ntsuam galvanized steel qhov chaw tiaj tus thiab noj cov txheej thickness ntsuas yuav ua kom muaj kev tiv thaiv corrosion txaus. Thaum ua tau, cov cheeb tsam uas sau cov dej tuaj yeem hais los ntawm kev muab cov qhov dej ntws los tiv thaiv kom tsis txhob ya raws ntawm qhov chaw mus ntev. Yog tias muaj qhov dej ntws tawm, tshawb xyuas cov qhov dej ntawm cov hlau galvanized rau corrosion thiab kov-up thaum tsim nyog.
√ Yav dhau los kov-up thaj chaw, thaj chaw ntawm kub-dip galvanized steel yav dhau los kov-up tom qab thawj txheej lossis erection feem ntau corrode sai dua li cov zinc txheej nyob ib puag ncig thiab yuav tsum tau kuaj pom qhov muag thiab kuaj nrog lub ntsuas qhov sib nqus.
Thaum lub sij hawm koj pom kev soj ntsuam ntawm galvanized steel nyob rau hauv lub tshav pob, koj yuav saib tau ob peb yam teeb meem tshwm sim thiab. Feem ntau yog ntog los yog zoo nkauj thiab tsis ua rau muaj kev txhawj xeeb; Txawm li cas los xij, lwm tus yuav xav tau kev saib xyuas thiab / lossis kev saib xyuas. Cov teeb meem tshwm sim feem ntau ntawm galvanized steel tom qab ua haujlwm rau ntau xyoo suav nrog:
√ Xim av Staining, feem ntau yuam kev rau corrosion, xim av staining yog ib tug deg mob tsim thaum xoob hlau nyob rau hauv zinc-hlau alloy txheej oxidizes. Raws li yav dhau los tau sau tseg hauv qhov kev tshaj tawm no, qee zaum kub-dip galvanized txheej txheej tsis muaj zinc txheej dawb (eta), tawm hauv cov txheej txheem intermetallic rau saum npoo. Tsis tas li ntawd, raws li huab cua galvanized steel, cov zinc txheej dawb yuav raug siv thiab tuaj yeem ua rau qhov tshwm sim no. Cov ntaub ntawv xim av staining thaum dawb hlau nyob rau hauv cov txheej txheem intermetallic reacts nrog ya raws nyob rau hauv ib puag ncig thiab oxidizes, discoloring lub puag ncig zinc txheej. Txhawm rau paub qhov txawv ntawm cov xim liab thiab xim av, tsuas yog sim thaj tsam nrog lub ntsuas qhov sib nqus. Yog tias qhov ntsuas ntsuas pom pom cov txheej tuab, nws yog xim av staining, thiab kev ua haujlwm corrosion ntawm galvanized txheej tsis cuam tshuam. Raws li xim av staining tsuas yog ib qho kev txhawj xeeb zoo nkauj, kov-up tsis tsim nyog nyob rau hauv qhov chaw stained.
√ Kev ntub dej stains, kev cia tsis raug thiab kaw ntom nti ntawm cov khoom siv galvanized tuaj yeem ua rau muaj kev txhim kho ntawm cov khoom ntub dej los yog zinc oxide thiab hydroxide build-up ntawm qhov chaw. Yog tias cov khoom siv galvanized yuav raug muab khaws cia ua ntej erection, nws yog ib qho tseem ceeb uas yuav tsum tau muab tso rau hauv lub pob kom tsis txhob muaj kev loj hlob ntawm cov khoom ntub dej.
√ Weeping welds, lawv feem ntau tshwm sim tom qab cov hlau ua haujlwm. Raws li kev tshuaj xyuas ua ntej, quaj welds feem ntau yog ib qho kev txhawj xeeb ntawm kev zoo nkauj; Txawm li cas los xij, kev xeb tuaj yeem ua kom nrawm rau hauv thaj chaw uas cov kua thiab xeb los ntshav tawm. Txhawm rau ntxuav thiab kaw cov weeping welds, koj tuaj yeem ntxuav cov oxides ntawm thaj chaw sab nrauv thiab siv epoxy los yog caulk rau hauv cheeb tsam kom tiv thaiv dej los ntawm kev nkag mus rau cov crevices yav tom ntej.
√ Uncoated me ntsis, lub galvanized txheej tuaj yeem cuam tshuam thaum xa khoom, tuav, erection, thiab thaum siv. Qee qhov kev tiv thaiv cathodic tau muab rau thaj chaw liab qab ntawm cov hlau los ntawm ib puag ncig galvanized txheej, tab sis cov cheeb tsam no tseem tuaj yeem xeb yog tias thaj chaw dav dhau los yog cov ntsiab lus corrosive nquag tawm tsam cov hlau. Kev tshawb fawb tau pom tias cov txheej galvanized muaj kev tiv thaiv cathodic rau thaj chaw liab qab ntawm 1mm - 5mm dav nyob ntawm cov electrolyte uas hluav taws xob txuas cov txheej txheej galvanized rau thaj tsam liab qab. Cov chaw liab qab yuav tsum tau kov-ua raws li cov txheej txheem tau teev tseg hauv daim ntawv tshaj tawm no thiab tau teev tseg hauv ASTM A780.
