Cov txheej txheem kom ntxaws ntawm cov txheej txheem tseem ceeb ntawm galvanized round round kav dej
1. Kub {{- dip galvanizing txheej txheem (muaj cov txheej txheem siv tau, cov nyiaj txiag rau ntau tshaj 80%)
Kub -} dip galvanizing yog ib qho txheej txheem ntawm "yeeb nkab ua thawj, galvanizing tom qab". Cov txheej txheem cuam tshuam tab sis txheej txheem txheej txheem ua tau ruaj khov. Nws yog qhov haum rau feem ntau cov qauv thiab kev thauj galvanized cov kav dej (xws li cov hauv nroog, tshuaj lom neeg, thiab chaw tsim khoom). Cov kauj ruam tshwj xeeb tuaj yeem muab faib ua peb theem: pre {{{} {{{- kev kho mob:
(1) pre {{- kev kho mob: tus yuam sij los ua kom muaj kev sib raug zoo ntawm cov txheej
Lub hom phiaj tseem ceeb ntawm pre - Kev kho mob yog kom tshem tawm cov roj, xeb ntawm cov yeeb nkab ntawm cov nplaum ntawm zinc txheej. Nws yog "txheej txheem yooj yim" uas txiav txim siab qhov zoo ntawm Galvanizing thiab feem ntau suav nrog 4 kauj ruam:
Degreasing (degreasing): Muab cov yeeb nkab steel nyob rau hauv cov roj alkaline hydroxide (} ove {{{{{{{{{{{}) Yog tias cov roj stains nyob twj ywm, nws yuav ua rau cov txheej txuas ntxiv rau "xau" (ib nrab ntawm zinc txheej).
Pickling (Rust tshem tawm): Tom qab degreasing, cov yeeb nkab steel yog siv cov roj fydroad (fe₂o₃) thiab ntsuas (Fe₃o₄), qhia txog cov xim huv. Lub sijhawm xaiv yuav tsum tau tswj (feem ntau yog 10 {-} 30 feeb). Lub sijhawm ntev ntev tuaj yeem ua rau "over-corrosion" (pitting saum npoo), thaum lub sijhawm luv luv tuaj yeem ua rau tsis muaj xeb ntev.
Rinsing (Neutralization): Tom qab pickling, residual acid yuav nyob rau saum npoo ntawm cov yeeb nkab steel. Tam sim ntawd yaug yaug nrog dej huv thiab tom qab ntawd rawv cov yeeb nkab hauv cov tshuaj alkaline tsis muaj zog (xws li cov kua qaub. Qhov no tiv thaiv txuas ntxiv acid corrosion thiab tom qab "bubbling" lossis "delamination" ntawm zinc txheej.
Kev ua kom ua kom (plating) tom qab yaug, cov yeeb nkab steel yog raus rau hauv "plating aqueous daws ntawm zinc chloride thiab ammonium chloride). Cov ntawv no ib zaj yeeb yaj kiab nyias nyias nyob saum npoo uas yog yooj yim soluble hauv Molten Zinc. Lub ntsev yeeb koob tuaj yeem cais cov pa thiab tiv thaiv cov yeeb nkab steel los ntawm re}}} ecidation ua ntej nkag mus rau cov lauj kaub zinc. Nyob rau tib lub sijhawm, nws txo qhov nro cuam tshuam nruab nrab ntawm cov zinc kua thiab saum npoo ntawm cov yeeb nkab steel, pab rau zinc kua rau ua raws li tusyees.