1) Skim
Tshuaj degreasing los yog dej-raws li hlau degreasing cov neeg ua hauj lwm yuav siv tau los degrease kom txog thaum lub workpiece yog kiag li ntub dej.
(2) Pickling
Nws tuaj yeem khaws nrog H2SO4 15%, thiourea 0.1%, 40 ~ 60 degree lossis HCl20%, urotropine 3 ~ 5g / L, 20 ~ 40 degree . Qhov sib ntxiv ntawm corrosion inhibitors tuaj yeem tiv thaiv kev xeb ntau dhau ntawm cov matrix thiab txo qis hydrogen nqus ntawm hlau matrix. Nyob rau tib lub sijhawm, ntxiv cov tshuaj tiv thaiv kab mob tuaj yeem tiv thaiv kev khiav tawm ntawm cov kua qaub. Tsis zoo degreasing thiab pickling kev kho mob yuav ua rau tsis zoo adhesion ntawm txheej, tsis muaj galvanizing, los yog zinc txheej yuav tev tawm.
(3) Dej hauv flux
Kuj tseem hu ua hnyav, nws tuaj yeem ua kom lub zog ua haujlwm ua ntej immersion plating, tsis txhob oxidation theem nrab, thiab yog li txhim kho lub zog sib txuas ntawm cov txheej thiab substrate. NH4Cl100-150g/L, ZnCl2150-180g/L, 70 ~ 80 degree, 1 ~ 2min. Thiab ntxiv ib qho nyiaj ntawm cov tshuaj tiv thaiv tawg.
(4) Qhuav thiab preheating
Txhawm rau tiv thaiv lub workpiece los ntawm deforming vim qhov kub thiab txias thaum lub sij hawm immersion plating, tshem tawm cov seem seem, thiab tiv thaiv qhov tawg ntawm zinc kua los ntawm zinc tawg, lub preheating feem ntau yog 80-140 degree .
