Passivation yog ib txoj hauv kev ua kom qeeb tus nqi ntawm cov hlau los ntawm kev hloov nws qhov chaw mus rau hauv lub xeev uas tsis tshua muaj oxidation. Tsis tas li ntawd, lub phenomenon ntawm ib tug active hlau los yog alloy, nyob rau hauv uas cov tshuaj lom neeg kev ua si yog heev txo mus rau lub xeev ntawm noble hlau, kuj hu ua passivation.
Passivation ntawm hlau nyob rau hauv ib puag ncig yog ua tiav nyob rau hauv ob txoj kev:
1. Tshuaj passivation: feem ntau yog los ntawm cov tshuaj tiv thaiv ntawm cov hlau thiab muaj zog oxidants, tsim ntawm ib tug ntom zaj duab xis ntawm oxides los yog lwm yam tebchaw nyob rau hauv cov hlau, uas npog cov hlau nto, cais cov hlau los ntawm cov tshuaj, yog li impeding. Cov hlau txuas txuas ntxiv oxidation thiab tawg.
2. Anodic passivation: tseem hu ua electrochemical passivation, yog raws li ib tug anode ntawm cov hlau los yog compound nyob rau hauv qhov kev txiav txim ntawm tam sim no, mus rau txawv degrees, poob lub peev xwm hloov mus rau cov tshuaj. Anodic passivation yog tshwm sim los ntawm anodic polarization ntawm cov hlau passivation tshwm sim, uas yog, cov hlau nyob rau hauv qhov kev txiav txim ntawm tam sim no, nws cov electrode tej zaum yuav hloov thiab tsim cov hlau oxides los yog ntsev nyob rau saum npoo ntawm lub electrode, cov tshuaj no nruj nreem npog nyob rau hauv lub electrode. hlau nto los ua ib zaj duab xis passivation thiab ua rau hlau passivation.
Feem ntau, txawm hais tias cov tshuaj passivation thiab anodic passivation ob qho tib si hloov cov hlau nto rau hauv lub xeev uas tsis tshua muaj kev cuam tshuam rau oxidation, lawv cov txheej txheem tsim thiab kev siv keeb kwm sib txawv. Tshuaj passivation tsim ib zaj duab xis tiv thaiv ntawm cov hlau nto feem ntau los ntawm cov tshuaj tiv thaiv, whereas anodic passivation ua ib zaj duab xis passivation ntawm cov hlau nto los ntawm cov txheej txheem electrochemical, ob qho tib si uas yog tsim los retard tus nqi ntawm corrosion ntawm cov hlau.
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Post lub sij hawm: Aug-14-2024