Lub hom phiaj ntawm kev kho passivation yog los tiv thaiv corrosion ntawm cov ntaub ntawv. Tom qab lub boiler yog pickled, ntxuav nrog dej, thiab rinsed, cov hlau nto yog huv si heev, activated heev, thiab susceptible corrosion. Yog li ntawd, nws yuav tsum tau passivated tam sim ntawd los tsim ib qho kev tiv thaiv zaj duab xis ntawm cov hlau ntxuav kom qeeb corrosion.
Kev kho mob Passivation tso qee cov hlau tseem ceeb hauv ib puag ncig tshwj xeeb thiab yuav hloov los ntawm lub xeev qub mus rau lub xeev tsis muaj zog. Uas yog hais tias, cov hlau no muaj tus cwj pwm passivation, uas tuaj yeem txhim kho corrosion kuj ntawm cov hlau, xws li chromium, Nickel, cobalt, titanium, zinc, hlau, thiab lwm yam. tag nrho cov muaj passivation zog. Cov oxidants uas tsim passivation muaj xws li concentrated nitric acid, potassium nitrate, potassium dichromate, poov tshuaj permanganate, potassium chlorate, acetic acid, boric acid, phosphoric acid thiab citric acid.
Kev tsim cov zaj duab xis passivation thaum lub sij hawm kho passivation zoo heev txo tus nqi corrosion. Qhov siab tshaj plaws ntawm cov zaj duab xis passivation ntawm cov hlau yog 10um, lub thickness ntawm passivation zaj duab xis ntawm txhuas yog 3um, thiab lub thickness ntawm passivation zaj duab xis ntawm stainless hlau tsuas yog 1um. Cov zaj duab xis passivation feem ntau yog ib qho sib xyaw ntawm oxygen thiab hlau. Lub passivation tshwm sim yog tshwm sim los ntawm cov tshuaj oxidation ntawm cov hlau thiab cov passivator, uas yog hu ua chemical passivation. Tus txheej txheem ntawm kev thov cov anode sab nraud tam sim no los hloov cov hlau los ntawm lub xeev nquag mus rau lub xeev passive hu ua anode passivation. hloov.
Anodic oxidation ntawm txhuas thiab txhuas alloys (piv txwv li, anode passivation) yog hais txog kev muab txhuas thiab txhuas alloys nyob rau hauv ib qho tsim nyog electrolyte thiab kev kho anode electrification. Qhov saum npoo tuaj yeem tsim cov oxide zaj duab xis nrog lub thickness ntawm 10 ~ 200um. Cov oxide zaj duab xis no muaj kev tiv thaiv corrosion zoo heev. Qhov kev ua tau zoo, hnav tsis kam, thiab cov khoom zoo nkauj tau zoo heev.
