Taw qhia ntawm cov kua qaub pickling thiab passivation
Cov kav hlau hlau yog siv dav hauv ntau qhov kev lag luam vim lawv cov kev ua tau zoo tshaj plaws, lub zog, thiab corrosion tsis kam. Txawm li cas los xij, kom lawv qhov kev ua tau zoo thiab kev ua haujlwm ntev, nws yog qhov tseem ceeb rau kev siv cov kev kho kom zoo xws li cov hlau pickling thiab passivation. Qhov blog no lub hom phiaj los txiav lub teeb rau qhov tseem ceeb ntawm cov txheej txheem no hauv kev txhim kho qhov zoo thiab ruaj khov ntawm cov kav hlau.
NTU 1: Dab tsi yog cov kauj ruam?
Steel pickling yog cov txheej txheem tshuaj lom neeg uas cuam tshuam nrog kev tsis txaus ntseeg, xws li xeb, teev, thiab oxides, los ntawm cov kav hlau. Lub hom phiaj ntawm pickling yog los ntxuav cov hlau saum npoo kom huv si, npaj nws rau kev kho cov nplaim khoom ntev li no raws li passivation.
Thaum lub sij hawm cov txheej txheem picking, cov kav dej steel yog raus hauv cov tshuaj acidic, feem ntau muaj hydrochloric lossis sulfuric acid. Cov acid reacts nrog impurities, yaj thiab tshem lawv tawm ntawm cov hlau saum npoo av, tawm ntawm qhov ua kom huv thiab du.
NTU 2: Tus Txheej Txheem Pickling:
Tus txheej txheem pickling cuam tshuam ntau qib kom ntseeg tau tias qhov kev tshem tawm cov khoom tsis zoo los ntawm cov kav hlau steel:
Kauj Ruam 1: Degreasing: Ua ntej Pickling, tus kav hlau ua ntej yog degreased tshem tawm cov roj, roj, lossis av tam sim no rau saum npoo. Cov kauj ruam no ua kom ntseeg tau tias cov acid tuaj yeem cuam tshuam ncaj qha nrog cov impurities ntawm cov hlau nto.
Kauj Ruam 2: Cov kua qaub acid: cov kav dej ntws tawm yog tom qab ntawd tso rau hauv cov kua qaub cov kua qaub. Lub sijhawm ntawm kev xav ntawm cov yam ntxwv xws li hom thiab tuab ntawm Oxide Txheej. Thaum lub sij hawm immersion, nws yog qhov tseem ceeb los soj ntsuam qhov kub thiab concentration ntawm cov kua qaub kom ua tiav cov txiaj ntsig xav tau.
Kauj Ruam 3: Cov kua qaub yaug: Tom qab cov txheej txheem picking, cov kav dej yog muab yaug nrog dej kom tshem tawm cov residual acid. Cov kauj ruam no yog qhov tseem ceeb los tiv thaiv qee cov kev coj ua uas tuaj yeem tshwm sim thaum cov kev kho mob hauv qab.
NTU 3: Tseem ceeb ntawm steel pickling:
Tus txheej txheem hlau pickling muaj ntau cov txiaj ntsig rau cov kav dej steel:
1. Xeb thiab nplai tshem tawm: Pickling tau tshem tawm cov xeb thiab nplai los ntawm cov hlau nto. Cov impurities no haum rau kev ncaj ncees thiab cov tsos ntawm cov kav dej, ua rau hnav kom ua ntej yug los thiab muaj peev xwm ua tsis tsaug zog.
2. Txhim kho corrosion tsis kam: los ntawm kev tshem tawm impurities, pickling tsim cov tog huv thiab oxide dawb, txhim kho cov hlau ua kom tsis txhob mob. Qhov no yog qhov tshwj xeeb tshaj yog rau cov kav dej uas siv hauv cov chaw hnyav lossis muaj kuab lom thiab noo noo.
3. Txhim kho cov nplaum: Pickling npaj cov hlau saum npoo los ntawm kev tsim cov txheej txheem ua kom tawv nqaij, pub rau cov kev ua kom zoo dua los yog kev ua kom zoo dua. Qhov no ua kom pom cov khoom nplaum zoo dua ntawm cov xim tiv thaiv tiv thaiv lossis txheej txheem txheej, ua rau lub sijhawm ntev durability ntawm cov kav hlau ntev ntawm cov kav hlau.
Tshooj 4: Nkag siab passivation:
Tom qab pickling, steel kav hla kev hla kev los tsim cov roj oxide rau saum npoo. Qhov no tau ua tiav los ntawm kev raus cov kav dej hauv tus neeg sawv cev passivating, feem ntau yog cov tshuaj diluted ntawm nitric acid.
Passivation ua ib qho nyias nyias, pob tshab zaj duab xis ntawm chromium oxide nyob rau saum npoo ntawm cov hlau, uas ua raws li kev thaiv tawm tsam kev xeb. Cov txheej no tseem yuav pab ua kom cov hlau txoj kev thov kom zoo nkauj thaum txo qhov kev pheej hmoo ntawm qhov staining lossis discoloration.
NTU 5: Cov txiaj ntsig ntawm Passivation:
Passivation muaj ntau cov txiaj ntsig tseem ceeb rau cov kav dej steel:
1. Corrosion Kuj: Tsim kev tsim cov txheej txheem tiv thaiv oxide ntau dhau los ua rau lub neej dhau los, ua rau muaj lub neej ntev thiab txo cov kev saib xyuas.
2. Kev thov kom zoo nkauj: passivation pab tswj cov kav hlau hlau los ntawm kev txo qhov sib xws ntawm cov npoo av, txo qis, lossis xeb me ntsis. Qhov no yog tshwj xeeb yog cov kav dej uas siv hauv cov ntawv kos duab lossis kev dai kom zoo nkauj.
3. Kev Noj Qab Haus Huv thiab Kev Nyab Xeeb: Ua rau muaj kev pheej hmoo ntawm cov kav hlau los sis paug, tshwj xeeb hauv cov kav dej siv rau cov khoom haus lossis khoom noj.
Xaus:
Hauv kev xaus, hlau pickling thiab passivation yog qhov tseem ceeb heev ntawm cov txheej txheem kev kho kom zoo rau cov kav hlau steel. Kev tshem tawm tau zoo los ntawm kev xaiv ntawm cov txheej txheem tiv thaiv oxide, corrosion tsis kam, thiab kev ua kom zoo nkauj ntawm cov kav hlau steel. Los ntawm kev nkag siab qhov tseem ceeb ntawm cov txheej txheem no, kev muaj peev xwm ua kom muaj peev xwm ntev thiab kev ntseeg tau ntawm cov kav hlau, thaum kawg ua rau kev txhim kho kev ua tau zoo thiab cov neeg siv khoom txaus siab.
Lub Sijhawm Post: Mar-30-2024