Pickling thiab passivation yog ob hom kev kho mob hlau saum npoo uas muab cov khoom tiv thaiv hlau, tshwj xeeb tiv thaiv xeb. Qhov tseeb, pickling thiab passivation xa mus rau immersing hlau nyob rau hauv da dej kom tshem tawm qhov tsis xws luag thiab xeb ntawm stainless hlau nto.
Thaum cov hlau yog rhuab los ntawm vuam los yog lwm yam kev kho cua sov mus rau qhov chaw uas muaj xim oxide txheej pom, muaj ib tug chromium-tsis zoo txheej ntawm cov hlau nto hauv qab oxide txheej. Qhov qis dua cov ntsiab lus chromium, qhov qis dua qhov corrosion kuj. Txhawm rau kho qhov zoo tshaj plaws corrosion kuj, cov txheej hlau puas yuav tsum tau muab tshem tawm kom nthuav tawm tag nrho cov hlau stainless hlau nto. Kev tshem tawm txhua yam tuaj yeem ua rau abrasive lossis lwm yam khoom siv thiab tej zaum yuav ua tsis tau. Kev kho tshuaj kom raug ntxuav lub ntsej muag thiab ua kom pom kev zoo corrosion.
Passivation thiab pickling feem ntau yog siv ua ke ntawm cov khoom siv los tshem tawm tag nrho cov kab mob sib kis thiab oxidation, txhim kho corrosion kuj, thiab ncua lub neej thiab tag nrho cov nqi ntawm koj cov khoom.
The difference between pickling and passivation >>
Pickling tuaj yeem tshem tawm vuam oxides thiab stainless hlau, tab sis passivation tsis tuaj yeem tshem tawm vuam oxides thiab yuav tsis corrode stainless hlau.
Pickling feem ntau yog hydrofluoric acid, sulfuric acid (los yog hydrochloric acid hauv cov nroj tsuag steel). Nws siv ntau corrosive acids dua cov uas siv rau passivation. Passivation yog nitric acid los yog electropolishing.
Pickling tshem tawm sulfides thiab carbon hlau uas ua rau qhov chaw puas. Passivation tshem tawm cov sulfides ntawm qhov chaw thiab maj mam tshem cov stains ntawm cov hlau
Pickling hloov cov tsos ntawm etching raws li nws txo cov gloss. Passivation, nitric acid thiab chelation kho yuav tsum tsis txhob hloov cov tsos.
Pickling feem ntau yog tov nrog nitric acid thiab rinsing, tawm hauv dull nto. Passivation tuaj yeem txhim kho cov yeeb yaj kiab passivation dua li cov yeeb yaj kiab yooj yim pickling.
Pickling and passivation standards >>
ASTM A380, Txuj Ci Txuj Ci rau Kev Tu, Descaling, thiab Passivation ntawm Stainless Hlau Cheebtsam, Khoom Siv, thiab Tshuab.
ASTM A967 Txuj kev coj ua rau kev siv tshuaj lom neeg ntawm stainless hlau qhov chaw.
Cov ntaub ntawv muaj txiaj ntsig zoo no muab cov lus qhia ntxaws ntxaws txog ntau yam ntawm kev xaiv, kev thov thiab kev ntsuam xyuas ntawm cov kev kho mob no.
