Galvanized steel hlau yog dav siv hauv kev tsim kho, kho vajtse, hlau mesh, lub zog thiab kev sib txuas lus, kev ua liaj ua teb thiab tsiaj txhu, kev loj guardrails, thiab steel hlua manufacturing. Cov khoom zoo ncaj qha cuam tshuam txog kev nyab xeeb ntawm txoj haujlwm, kev pabcuam lub neej, thiab kev ntseeg siab; Yog li ntawd, nruj, sib koom ua ke, thiab muaj peev xwm ua tau zoo cov qauv yuav tsum tau ua raws li tag nrho cov txheej txheem tsim khoom.
Cov khoom siv tseem ceeb rau galvanized steel hlau yog kub- dov qis- carbon steel hlau pas nrig, feem ntau ua los ntawm cov ntaub ntawv xws li Q195, Q215, Q235, SAE 1006, SAE 1008, SAE 1010, thiab SWRCH18A. Raw khoom zoo yog qhov tseem ceeb tshaj plaws txiav txim siab cov khoom siv kho tshuab, qhov zoo ntawm qhov chaw, thiab zinc plating adhesion ntawm cov khoom tiav. Cov ntsiab lus carbon ncaj qha cuam tshuam rau lub zog, toughness, thiab drawability ntawm steel hlau thiab yuav tsum nruj tswj: C Tsawg dua los yog sib npaug rau 0.15%, Si Less dua los yog sib npaug rau 0.07%, Mn0.30% ~ 0.60%, P Tsawg dua los yog sib npaug rau 0.035%, S Tsawg dua los yog sib npaug rau 0.035%. P thiab S yog teeb meem impurities; Cov qib ntau dhau tuaj yeem ua rau muaj zog brittleness, kos pob txha, thiab tsis zoo zinc plating adhesion. Yog li ntawd, nruj ua raws li cov kev txwv sab sauv yog qhov tseem ceeb.
Cov cuab yeej siv tshuab feem ntau txiav txim siab qhov chaw thov ntawm Galvanized Steel Hlau. Peb xav tau lub zog tensile ntawm 290 ~ 420MPa, elongation Ntau dua lossis sib npaug li 25%, txo thaj tsam Ntau dua lossis sib npaug li 55%, thiab hardness HRB 60 ~ 75. Cov hlua hlau yuav tsum tsis txhob muaj kev sib cais, delamination, lossis shrinkage kab noj hniav; txwv tsis pub, nws yog nquag tawg thaum lub sij hawm kos duab thiab kab nrib pleb hauv cov khoom tiav. Ntau tus neeg siv muaj cov cai nruj heev rau qhov zoo ntawm Galvanized Hlau Hlau. Cov kws tshaj lij yuav tsum xyuas kom meej tias qhov chaw tsis muaj kab nrib pleb, folds, nti, burrs, tuab tuab hlau oxide nplai, xeb me ntsis, roj stains, thiab impurities thaum tawm hauv lub hoobkas. Txoj kab uas hla yuav tsum yog ± 0.20mm, thiab lub ellipticity tsawg dua los yog sib npaug li 60% ntawm txoj kab uas hla kam rau ua. Hlau rods nrog hnyav nto xeb yog txwv tsis pub los ntawm ntau lawm; txwv tsis pub, pickling yuav tsis tiav thiab zinc txheej adhesion yuav tsis zoo.
Lub hom phiaj tseem ceeb ntawm pretreatment yog tshem tawm oxide nplai, xeb, thiab roj, kom huv si thiab activated steel hlau nto los lav ib tug zoo metallurgical daim ntawv cog lus ntawm molten zinc thiab steel substrate. Tsis zoo pretreatment thaum lub sij hawm zus tau tej cov Galvanized Steel Hlau yuav ncaj qha mus rau zinc txheej tev, tsis tiav plating, thiab discoloration.
Degreasing thiab roj tshem tawm cov qauv zoo: Alkali concentration 5% ~ 10%, kub 60 ~ 80 degree, kho lub sijhawm 3 ~ 8min. Kev soj ntsuam tus qauv: Tsis muaj roj stains lossis saponification residue ntawm cov hlau hlau nto, tsis tu ncua thiab cov yeeb yaj kiab dej tsis sib xws, tsis muaj cov kab noj hniav.
Acid pickling thiab xeb tshem tawm cov qauv zoo: Feem ntau siv hydrochloric acid pickling. Concentration, kub, thiab lub sij hawm yuav tsum tau nruj me ntsis tswj. Hydrochloric acid concentration 12% ~ 18%, kub chav tsev kub ~ 45 degree, lub sij hawm 5 ~ 15min. Tom qab pickling, qhov saum npoo yuav tsum muaj cov nyiaj ua kom tiav- grey metallic luster, tsis muaj oxide nplai seem, thiab tsis dhau - corrosion. Tshaj -corrosion yog txiav txim los ntawm cov tsos ntawm pitting, hydrogen embrittlement, los yog blackening ntawm qhov chaw; yog tias pom, qhov saum npoo yuav tsum tau muab pov tseg.
Cov qauv kev ntxuav dej zoo: Tom qab cov kua qaub pickling, ntau -theem countercurrent rinsing yog yuav tsum tau. Thawj theem siv dej huv kom tshem tawm cov kua qaub dawb. Qhov thib ob theem siv pH ntau dua lossis sib npaug ntawm 4 los tiv thaiv cov kua qaub los ntawm kev nqa mus rau hauv lub tank fluxing. Kev soj ntsuam tus qauv: Tsis muaj acid residue lossis hlau ntsev adhesion ntawm qhov chaw.
Fluenting kho cov qauv zoo: Flux feem ntau yog zinc chloride + Cov tshuaj ammonium chloride sib xyaw ua haujlwm los tiv thaiv oxidation theem nrab thiab txhim kho cov wettability ntawm zinc da dej. Peb xav tau ib qho concentration ntawm 150-250 g / L, qhov kub ntawm 50-70 degree, pH ntawm 4.0-5.5, lub sij hawm kho ntawm 1-3 feeb, kom qhuav kub ntawm 120-200 degree, thiab ib tug txheej txheem kom qhuav lub sij hawm ntawm tiav deg dryness, tsis muaj noo noo, ntsev stains, thiab uneven crystallization. Cov tshuaj flux yuav tsum tau lim tsis tu ncua kom tshem tawm slag; txwv tsis pub, zinc slag thiab zinc nodules yuav tsim, cuam tshuam rau qhov zoo ntawm cov hlau Galvanized hlau.
Galvanizing tau muab faib ua kub-dip galvanizing thiab electro-galvanizing, thiab cov qauv zoo ntawm ob qhov sib txawv heev, ua rau nws yog qhov tseem ceeb ntawm kev soj ntsuam kev lag luam txawv teb chaws.
Kub-dip galvanized steel hlau zoo qauv: Kub-dip galvanizing tshwm sim nyob rau hauv ib tug tuab zinc txheej thiab ntev corrosion kuj, raws li ISO 1460, ASTM A641, thiab GB / T 20492. Raw khoom zinc ingots yog 99.99% ntshiab zinc, conforming rau 7 GB / 4 Zinc 4℃kub. Cov ntsiab lus ntawm txhuas yog 0.18% ~ 0.22%, zinc da dej impurities tsawg dua lossis sib npaug li 0.02% Fe, thiab kev siv cov zinc rov ua dua yog txwv.
Electro-galvanized steel hlau zoo qauv: Electro-galvanized steel hlau muaj ib tug du nto thiab ib tug nyias txheej zinc txheej, haum rau precision khoom. Cov zinc txheej hnyav yog 10 ~ 40g / m², tuab yog 1.4 ~ 5.6μm, qhov saum npoo yog ci thiab zoo ib yam, tsis muaj scorching lossis darkening, thiab nws muaj tsawg brittleness, ua rau nws haum rau khoov thiab sib sau. Nws qhov kev tiv thaiv corrosion tsis muaj zog dua li kub -dip galvanizing, thiab nws tsis haum rau ib puag ncig corrosive heev.