Ntau cov hlau yuav tsim cov oxide zaj duab xis rau ntawm qhov chaw thaum lub sij hawm cov txheej txheem ntawm reacting nrog oxygen nyob rau hauv cov huab cua.Tab sis hmoov tsis, cov tebchaw tsim los ntawm cov pa roj carbon zoo tib yam yuav txuas ntxiv mus rau oxidize, ua rau xeb kom nthuav dav lub sijhawm, thiab thaum kawg tsim qhov.Txhawm rau zam qhov teeb meem no, peb feem ntau siv cov xim los yog oxidation-resistant hlau (xws li zinc, npib tsib xee, thiab chromium) rau electroplating ntawm cov pa roj carbon steel.
Hom kev tiv thaiv no tsuas yog ib zaj duab xis yas xwb.Yog tias cov txheej tiv thaiv raug puas tsuaj, cov hlau hauv qab yuav pib xeb.Qhov twg yog qhov xav tau, muaj kev daws teeb meem, thiab kev siv cov hlau tsis huv tuaj yeem daws qhov teeb meem no zoo kawg nkaus.
Kev tiv thaiv corrosion ntawm stainless hlau nyob ntawm lub "chromium" keeb nyob rau hauv nws muaj pes tsawg leeg, vim hais tias chromium yog ib yam ntawm cov hlau, yog li txoj kev tiv thaiv tsis zoo ib yam.Thaum cov ntsiab lus chromium nce mus txog 10.5%, atmospheric corrosion kuj ntawm cov hlau nce ntau, tab sis thaum cov ntsiab lus chromium siab dua, txawm hais tias qhov corrosion kuj tseem tuaj yeem txhim kho, cov nyhuv tsis pom tseeb.
Qhov laj thawj yog vim li cas thaum chromium siv rau kev kho mob zoo ntawm cov hlau, hom oxide txheej tau hloov mus rau saum npoo oxide zoo ib yam li tsim los ntawm cov hlau ntshiab chromium.Qhov no nruj nreem adhered chromium-nplua nuj hlau oxide tiv thaiv saum npoo ntawm oxidation ntxiv los ntawm huab cua.Hom oxide txheej no yog nyias nyias, thiab lub ntuj ci nyob rau sab nraud ntawm cov hlau tuaj yeem pom los ntawm nws, ua rau cov hlau tsis muaj hlau muaj qhov tshwj xeeb ntawm cov hlau.
Ntxiv mus, yog tias cov txheej txheej saum npoo raug puas lawm, qhov cuam tshuam ntawm qhov chaw yuav kho nws tus kheej nrog cov tshuaj tiv thaiv atmospheric thiab rov ua qhov "passive film" txuas ntxiv mus ua lub luag haujlwm tiv thaiv.Yog li ntawd, tag nrho cov hlau tsis muaj steel muaj cov yam ntxwv zoo, uas yog, cov ntsiab lus chromium yog siab dua 10.5%.
Post lub sij hawm: Dec-19-2022