1.Lub hauv paus ntsiab lus yog dab tsi?
Nyob rau hauv qhov siab - kub (kwv yees li 135-155 degree) muaj zog alkaline (sodium hydroxide) tov, ib tug oxidizing tus neeg sawv cev (sodium nitrite) yog ntxiv rau xaiv oxidize cov hlau nto, tsim ib ntom hlau (II, III) oxide (Fe₃O₄) zaj duab xis.
2.Yuav ua li cas deg pretreatment?
Tshuaj degreasing: Siv cov tshuaj ntxuav alkaline lossis cov kuab tshuaj organic kom huv si tshem cov roj thiab roj. Cua sov rau 60-80℃tuaj yeem txhim kho cov nyhuv.
Acid pickling rau kev tshem tawm xeb: Raus hauv dilute hydrochloric acid los yog sulfuric acid tov (kwv yees li 10-20% concentration) kom tshem tawm cov xeb xoob thiab oxide nplai, nthuav tawm cov hlau huv si. Lub sij hawm pickling yuav tsum txaus kom tshem tawm tag nrho cov xeb; Kev ntub dej ntau dhau yuav tsum tau zam kom tsis txhob dhau-corrosion.
Kev yaug dej: Yaug ntau zaus nrog dej txias lossis dej kub kom tshem tawm cov kua qaub thiab cov khoom seem ntawm qhov chaw ua haujlwm. Qhov no yog ib qho tseem ceeb rau kev tiv thaiv kev kis kab mob ntawm lub bluing da dej.
3.Dab tsi yog cov txheej txheem tseem ceeb ntawm alkaline siab - kub bluing?
Kev npaj daws teeb meem:
Ntxiv dej rau lub tank bluing (stainless steel lossis carbon steel tank pom zoo).
Ntxiv sodium hydroxide (NaOH) thiab sodium nitrite (NaNO₂).
Cov piv txwv: NaOH 500-600 g / L, NaNO₂ 100-150 g / L. Qhov tshwj xeeb piv yuav tsum tau hloov me ntsis raws li cov hlau muaj pes tsawg leeg.
Cua sov thiab immersion:
Tshav kub cov tshuaj rau boiling, feem ntau ntawm 135-155℃(boiling kub nyob ntawm kev daws concentration).
Ua kom tiav qhov huv huv thiab qhuav txias txias - dov coils (cov khoom me me tuaj yeem muab tso rau hauv lub pob tawb) rau hauv cov kua dej npau npau.
Lub Sijhawm Ua Haujlwm: Feem ntau ntawm 20 thiab 90 feeb, nyob ntawm qib steel, kev daws teeb meem, thiab kub. Saib cov xim hloov ntawm qhov chaw: los ntawm daj → liab → ntshav → xiav -dub.
Kev Txiav Txim Xim: Cov xim zoo tshaj plaws yog ib qho "steel xiav" lossis tob dub. Ib qho xim sib zog yuav qhia tau tias lub sijhawm tsis txaus lossis tsis muaj concentration.
4.Post-kev kho mob txiav txim siab tiv thaiv xeb li cas?
Cleaning: After removing from the bluing tank, immediately rinse thoroughly with hot water (>80 degree) tshem tawm cov seem uas muaj zog alkaline.
Saponification los yog Passivation:
Saponification: Raus dej hauv 3-5% xab npum tov ntawm 80-90℃rau 3-5 feeb. Cov xab npum (stearic acid) reacts nrog oxide zaj duab xis los tsim cov yeeb yaj kiab hydrophobic hlau stearate, txhim kho kev tiv thaiv xeb.
Passivation: Xwb, raus hauv 3-5% potassium dichromate tov rau passivation filling.
Roj Immersion: Qhov no yog cov kauj ruam kawg tseem ceeb. Raus lub workpiece nyob rau hauv kub (105-110 degree) xeb-cov roj tiv thaiv (xws li transformer roj los yog spindle roj) rau 3-5 feeb, ces ntws. Cov roj zaj duab xis sau cov micropores ntawm oxide zaj duab xis, zoo heev txhim kho nws cov xeb tiv thaiv thiab hnav tsis kam. Los tiv thaiv xeb los yog siv quav ciab tuaj yeem siv tau.
5.Dab tsi yog qhov tseem ceeb tswj cov ntsiab lus thiab ceev faj?
Kev Nyab Xeeb Ua Ntej: Qhov chaw ua haujlwm yuav tsum ua kom zoo -ventilated. Hnav cov khaub ncaws tiv thaiv acid thiab alkali tiv thaiv, hnab looj tes, tsom iav, thiab daim npog ntsej muag. Cov tshuaj pov tseg yuav tsum ua raws li cov txheej txheem kev nyab xeeb.
Cov Khoom Siv Txwv: Tsawg- thiab nruab nrab- carbon steel thiab qis- alloy steel yog qhov zoo tshaj plaws rau bluing. High- carbon steel muaj xim tsaus, thiab hlau alloy (xws li chromium steel) tej zaum yuav muaj xim liab lossis xim tsis sib xws. Cov khoom sib txawv ntawm cov khoom txias -rolled coils yuav tsum zoo ib yam.
Txheej Txheej Txheej Txheem: Bluing zaj duab xis muaj qhov tsis zoo rau kev puas tsuaj thiab feem ntau yog siv rau hauv qhov chaw me me hauv tsev lossis luv luv - tiv thaiv xeb. Nws tsis tuaj yeem hloov tuab - txheej tiv thaiv xws li electroplating zinc lossis chrome plating.
Kev tsim khoom loj: Rau qhov txias tas mus li-rolled coils, txuas mus ntxiv los ntawm- hom bluing ntau lawm kab tuaj yeem siv tau, suav nrog ntu ua ntej, bluing tank, ntau- theem rinsing tank, thiab ziab thiab oiling seem, kom ua tiav cov khoom lag luam.
Kev soj ntsuam zoo:
Cov tsos mob: Uniform xim, tsis muaj mottling lossis liab xeb.
Corrosion Resistance: A 3% neutral copper sulfate drop test should show no red color after >30 vib nas this los txiav txim siab 合格 (tsim nyog).
Zaj duab xis adhesion: Thaum muaj zog so nrog cov paj rwb dawb, nws yuav tsum tsis txhob tev tawm.