Los ntawm Zinc Txheej Rau Cov Yeeb Nkab Galvanized

Kev xau ntawm zinc txheej (qhov twg qee qhov chaw tsis ua tiav nrog zinc txheej thiab cov hlau substrate raug) yog ib qho tsis xws luag hauv cov txheej txheem kub -dip galvanizing.

Qhov tseem ceeb, nws yog vim hais tias cov hlau nto tsis yog tag nrho los ntawm cov kua zinc, thiab zinc txheej tsis tuaj yeem txuas ntxiv mus. Los ntawm cov txheej txheem tsim khoom, ntau dua 90% ntawm cov teeb meem xau los ntawm kev kho ua ntej - kev kho mob ua ntej txheej txheej txheej, ua raws li cov txheej txheem tswj tsis raug nyob rau hauv qhov kub - dip zinc immersion theem, thiab ob peb yog tshwm sim los ntawm qhov tsis xws ntawm cov ntaub ntawv raw lawv tus kheej.

Lub hom phiaj ntawm kev kho ua ntej - yog kom tau txais cov hlau huv thiab ua haujlwm zoo. Ib qho kev sib kis ntxiv yuav cuam tshuam ncaj qha rau kev nkag mus ntawm zinc tov, ua rau nws yog thawj qhov ua rau underplating.

1. Degreasing thiab roj tshem tawm txheej txheem
Cov roj dov, tiv thaiv-cov roj xeb, thiab kos cov roj nplua nyeem ntawm cov yeeb nkab steel yog cov khoom siv hauv qab. Tshwj xeeb tshaj yog cov roj stains nyob rau hauv cov phab ntsa sab hauv thiab weld seam gaps yog qhov nyuaj tshaj plaws los tshem tawm.

• Yog vim li cas txawv txav: Tsis txaus concentration / kub ntawm degreasing tus neeg saib xyuas, lub sij hawm luv luv degreasing, ua rau tsis tiav saponification thiab emulsification ntawm cov roj; Cov tshuaj degreasing tau siv rau lub sijhawm ntev, thiab cov roj stains tau ua kom txaus thiab tsis muaj txiaj ntsig; Tsis muaj cyclic degreasing tau ua rau cov phab ntsa sab hauv, ua rau loj -cov roj seem ntawm cov phab ntsa sab hauv.
• Cov yam ntxwv ntawm underplating: Feem ntau nyob rau hauv daim ntawv ntawm cov nplooj ntawv tsis sib xws los yog dots, nrog cov ciam teb ntshiab, thiab tag nrho sib haum mus rau qhov chaw ntawm cov roj stains.

2. Acid pickling xeb txheej txheem tshem tawm
Nws tau muab faib ua ob hom teeb meem: "Tsis txaus acid pickling" thiab "Tshaj-acid pickling nrog xeb residue".

• Tsis txaus acid pickling: Tseem muaj cov tawv oxide uas tseem tshuav nyob rau ntawm qhov chaw, thiab cov xeb hauv qhov sib sib zog nqus xeb tsis tau muab tshem tawm tag nrho. Cov tawv nqaij oxide tsis nkag mus rau cov tshuaj zinc, ua rau tsis tiav plating. Qhov no feem ntau yog tshwm sim los ntawm cov kua qaub qis concentration, tsis txaus kub, tsis txaus acid pickling lub sij hawm, los yog nruj heev stacking ntawm steel kav, nrog rau kev sib cuag tsis sib xws ntawm cov kua qaub.
• Tshaj -acid pickling nrog xeb residue: Cov kua qaub ntau dhau yuav ua rau lub hauv paus steel, ua rau cov pa roj carbon monoxide, silicon thiab lwm yam impurities los nag thiab tsim ib txheej "rust residue", uas cuam tshuam kev sib cuag ntawm zinc tov thiab lub hauv paus, ua rau qhov chaw tsaus -zoo li plating tsis tiav.

3. Cov txheej txheem ntxuav dej
Yog tias cov dej ntxuav tom qab ntxuav cov kua qaub tsis txaus, cov kua qaub seem thiab cov ntsev hlau yuav paug cov tshuaj plating tom qab, ua rau cov yeeb nkab steel nto sai sai - xeb thiab tsim taw tes -zoo li los yog pos{2}}zoo li plating plating thaum nkag mus rau hauv lub lauj kaub zinc. Kev ntxuav cov phab ntsa sab hauv tsis txaus yog ib qho ua rau cov yeeb nkab xau plating.

4. Plating Aid Solvent txheej txheem
Plating pab yog qhov txuas tseem ceeb uas txuas cov kauj ruam dhau los nrog rau ib qho tom ntej. Nws txoj haujlwm yog tshem tawm micro xeb, tsim cov yeeb yaj kiab tiv thaiv kom tsis txhob muaj oxidation, thiab txhim khu lub wettability ntawm zinc tov.

• Ua tsis tiav ntawm plating pab daws: Kev tsis sib haum xeeb hauv qhov piv ntawm zinc chloride thiab ammonium chloride, tsis tshua muaj concentration, lossis cov hlau ions ntau dhau (ntau tshaj 1g / L) yuav ua rau muaj ntau cov hlau ntsev impurities adhering rau saum npoo, cuam tshuam kev sib kis ntawm zinc tov.
• Ikom qhuav qhuav: Yog tias qhov ziab tom qab plating tsis zoo, cov dej noo yuav nkag mus rau hauv lub lauj kaub zinc thiab, thaum ntsib qhov kub ntawm - zinc tov, nws yuav sai sai vaporize, tsim pores thiab taw tes - zoo li undercoating; Yog hais tias qhov kub thiab txias yog siab dhau lawm, lub plating zaj duab xis yuav decompose thiab ua tsis tiav, thiab saum npoo yuav raug oxidation theem nrab.
• Lub sijhawm nyob ntau dhau tom qab plating pab: Yog hais tias qhov chaw absorbs noo noo thiab re- xeb, re-plating yuav inevitably ua rau undercoating.

1. Inconsistency nyob rau hauv Zinc Solution Composition thiab Purity

• Cov ntsiab lus ntawm aluminium tsis zoo: Txhawm rau txhim kho cov khoom ntub dej thiab qhov ci ntawm cov txheej, 0.05% mus rau 0.15% ntawm txhuas yuav tsum tau ntxiv rau cov tshuaj zinc. Cov ntsiab lus txhuas tsis txaus yuav ua rau cov khoom tsis zoo ntawm cov zinc tov thiab loj - nplai hauv qab - txheej.
• Ntau dhau impurities: Ntau cov hlau, txhuas, thiab lwm yam hauv cov tshuaj zinc ua rau ntau cov zinc slag thiab zinc plua plav tshem tawm, adhering rau saum npoo ntawm cov yeeb nkab steel thaum kub -dip galvanizing, tsim cov ntsiab lus tawg ntawm - zoo li hauv qab - txheej.

2. Kev tswj qhov kub thiab txias tsis txaus

• Zinc tov kub qis heev (< 430℃): Cov tshuaj zinc muaj cov viscosity siab thiab cov dej tsis zoo, ua rau nws tsis tuaj yeem nkag mus rau hauv qhov chaw zoo xws li weld seams thiab xeb pits. Sab hauv phab ntsa ntawm cov yeeb nkab yog tshwj xeeb tshaj yog nyob rau thaj tsam ntawm qhov tsis tiav plating.
• Lub sij hawm ntub dej tsis txaus: Yog tias cov tshuaj zinc raug tshem tawm ua ntej nws tau npog tag nrho saum npoo, thaj chaw loj ntawm cov plating tsis tiav yuav tshwm sim ntawm phab ntsa sab hauv ntawm cov yeeb nkab, weld seams, thiab lwm qhov chaw.

3. Zinc immersion kev khiav hauj lwm thiab cov teeb meem tso pa (tshwj xeeb rau cov khoom siv yeeb nkab)
Thaum cov yeeb nkab steel yog muab tso rau hauv lub lauj kaub zinc, lub kaum sab xis tsis raug thiab cov pa tawm tsis zoo. Huab cua yuav raug dai rau hauv cov yeeb nkab, tsim ib qho "air chamber". Cov kua zinc tsis tuaj yeem nkag mus rau hauv cov phab ntsa sab hauv, ua rau loj - thaj tsam strip / phaj- zoo li tsis tiav plating ntawm phab ntsa sab hauv. Qhov no yog ib hom kev tsis tiav plating rau cov kav dej galvanized. Kev tshem tawm ntau dhau tuaj yeem ua rau tsis sib xws ntawm cov kua zinc, uas ua rau nyias plating thiab plating tsis tiav.

1. Cov khoom siv hlau

Thaum cov ntsiab lus silicon nyob hauv thaj tsam ntawm 0.08% mus rau 0.15% hauv "Sandelin rhiab cheeb tsam", cov hlau -zinc cov tshuaj tiv thaiv yuav txawv txav. Tsis tsuas yog cov txheej ua npub thiab tuab, tab sis nws cov khoom ntub dej kuj raug txo, nrog rau cov txheej tsis tiav thiab tsis zoo adhesion.

2. Qhov chaw tsis zoo

    Cov yeeb nkab steel muaj qhov sib sib zog nqus xeb, folds, pores, slag inclusions, thiab cov ntsiab lus nyob rau hauv qhov khoob yog nquag ua kom cov roj thiab cov kua qaub. Kev kho ua ntej -kev kho tsis tuaj yeem tshem tawm tag nrho, thiab cov haujlwm sib thooj yuav ua rau muaj cov txheej txheem tsis tiav.

3. Weld Defects

Weld slag, pores, thiab tsis tiav weld seams khaws cov av thiab cov kab mob. Cov cheeb tsam nyob ib puag ncig cov welds yog qhov siab - thaj chaw muaj kev pheej hmoo rau cov txheej tsis tiav.

Rau cov txheej txheem saum toj no, kev tswj hwm tuaj yeem ua tau los ntawm qhov ntev hauv qab no:

• Degreasing theem: Siv kev sib xyaw ua ke ntawm alkaline ntxuav thiab surfactant rau degreasing, nrog rau qhov kub ntawm 50 mus rau 70 degree, sib piv cov alkalinity thiab lub sijhawm kho; Ua kom cov dej ntws tawm degreasing rau ntawm phab ntsa sab hauv ntawm cov yeeb nkab, thiab kuaj cov nyhuv degreasing siv "txoj kev ua yeeb yaj kiab dej txuas ntxiv" (cov yeeb yaj kiab dej saum npoo tsis zoo thiab tsis tawg tom qab ntxuav dej tiav, uas suav tias tsim nyog); Tsis tu ncua hloov cov tshuaj degreasing kom tshem tawm cov roj ntab ntawm cov kua dej.
• Acid ntxuav theem: Tswj cov concentration ntawm hydrochloric acid ntawm 15% mus rau 20%, ua haujlwm ntawm chav tsev kub, ntxiv corrosion inhibitors los tiv thaiv cov kua qaub ntau dhau; Qhov kawg yog kom tshem tawm cov xeb flakes tag nrho, zam dhau - sij hawm acid ntxuav; Cia qhov khoob txaus thaum txhim kho cov yeeb nkab thav duab kom ntseeg tau tias cov kua qaub tuaj yeem tiv tauj sab hauv thiab sab nraud; Ua ntej- txhuam qhov tob xeb ua ntej.
• Kev ntxuav dej theem: Siv 2 mus rau 3 qib rov qab ntxuav dej, hloov cov dej tsis tu ncua; Ua kom siab -siab sab hauv phab ntsa ntws los tiv thaiv cov kua qaub seem ntawm kev nqa mus rau hauv lub plating da dej.
• Ncej -plating thiab ziab:

1. Tswj tag nrho cov ntsev concentration ntawm cov ncej -plating tov ntawm 20 mus rau 28 degree, pH 4.0 rau 5.5, kub 60 mus rau 80 degree, qhov ratio ntawm zinc chloride rau ammonium chloride yog 1: 2 rau 1: 3;
2. Tsis tu ncua ntxuav thiab tshem tawm cov hlau ions (siv hydrogen peroxide oxidation thiab pom), tswj cov hlau ions kom tsis pub dhau 1g / L;
3. Qhov kub kom qhuav yog 100 txog 150 degree, kom ntseeg tau tias cov khoom ua haujlwm tau qhuav tag, thaum zam dhau - ziab thiab decomposition ntawm ncej-plating zaj duab xis;
4. Nkag mus rau lub lauj kaub zinc kom sai li sai tau tom qab tshaj tawm -plating, nrog lub sijhawm nyob tsis pub tshaj 2 teev kom tsis txhob rov- xeb.

• Zinc Solution Management: Tswj cov ntsiab lus ntawm txhuas nyob rau hauv thaj tsam ntawm 0.05% mus rau 0.12%, thiab tsis tu ncua kuaj cov muaj pes tsawg leeg; tsis tu ncua tshem tawm zinc tshauv thiab slag, thiab tswj cov ntsiab lus hlau kom tsawg dua 0.05%, txo kev cuam tshuam los ntawm impurities.
• Parameter sib piv: Qhov kub ntawm cov tshuaj zinc tsis tu ncua yog tswj ntawm 435 txog 455℃. Lub sij hawm soaking yog hloov raws li cov yeeb nkab txoj kab uas hla thiab phab ntsa thickness (feem ntau yog 30 mus rau 90 vib nas this) kom paub meej tias so.
• Txheem kub-dip galvanizing ua haujlwm: Siv cov txheej txheem inclined maj mam ncuav cov tshuaj rau hauv lub lauj kaub, kom ntseeg tau tias cov huab cua hauv cov yeeb nkab raug tshem tawm tag nrho thiab zam qhov tsim ntawm lub hnab ntim cua; rau cov kav loj - txoj kab uas hla, ib qho kev pab cuam tso tawm tuaj yeem ntxiv rau ntawm cov yeeb nkab kawg; maj mam nqa lub lauj kaub ntawm qhov tsis sib xws, tso cai rau cov kua zinc ntau dhau los ua kom poob qis thiab sib kis.

• Nyiam xaiv cov kav hlau uas tsim nyog rau silicon thiab phosphorus cov ntsiab lus, zam qhov chaw rhiab ntawm Sandlin; yog siv high-silicon steel, kho cov zinc- txhuas cov ntsiab lus ntawm cov zinc molten thiab ntxiv cov ntsiab lus nickel kom hloov mus rau cov txheej txheem.
• Thaum lub Hoobkas tshuaj xyuas, tshem tawm cov kav dej uas muaj xeb sib sib zog nqus, folds, lossis qhov tsis xws luag ntawm qhov chaw; xyuas kom meej tias cov txheej txheem vuam muaj cov welds du yam tsis muaj slag lossis pores, thiab txo qhov muaj peev xwm ntawm cov av hauv qhov khoob.

• Ua thawj zaug -kev tshuaj xyuas. Rau txhua batch, ua ib qho kev tshuaj ntsuam xyuas ntawm cov txheej txheej sab hauv thiab txheej txheej. Yog tias pom ib qho undercoating, tam sim tshuaj xyuas cov txheej txheem thiab kho qhov tsis muaj.
• Cov me me thiab me me - cheeb tsam undercoating tuaj yeem kho tau los ntawm kev siv cov zinc kub txau lossis txias galvanizing txheej; rau loj - cheeb tsam undercoating, rework yog yuav tsum tau. Reacid ntxuav, siv cov txheej txheem pab, thiab tom qab ntawd ua cov galvanizing theem nrab.