Kev tiv thaiv xeb ntawm cov hlau tsis huv nyob ntawm chromium, tab sis vim tias chromium yog ib qho ntawm cov khoom siv hlau, kev tiv thaiv kev sib txawv yog txawv.
Thaum qhov sib ntxiv ntawm chromium nce mus txog 10.5%, qhov kev tiv thaiv huab cua tiv thaiv huab cua ntawm cov hlau tau nce ntau, tab sis thaum cov ntsiab lus chromium siab dua, txawm hais tias kev txhim kho corrosion kuj tseem tuaj yeem txhim kho, nws tsis pom tseeb. Qhov laj thawj yog tias thaum hlau tau sib xyaw nrog chromium, hom oxide saum npoo tau hloov pauv mus rau saum npoo av zoo ib yam li uas tau tsim los ntawm cov hlau chromium dawb huv. Qhov no nruj nreem ua cov chromium-nplua nuj oxide tiv thaiv saum npoo thiab tiv thaiv kev oxidation ntxiv. Cov txheej txheej oxide no yog qhov hnyav heev, thiab cov lus ci ntuj ntawm cov hlau saum npoo tuaj yeem pom los ntawm nws, muab cov hlau tsis muaj qhov tshwj xeeb nto. Tsis tas li ntawd, yog tias txheej txheej txheej puas, cov hlau nthuav tawm yuav cuam tshuam nrog huab cua los kho nws tus kheej, rov ua daim ntawv no" passivation film&"; thiab txuas ntxiv ua lub luag haujlwm tiv thaiv.
Yog li ntawd, txhua cov hlau tsis muaj steel muaj cov yam ntxwv sib xws, uas yog, cov ntsiab lus chromium siab dua 10.5%.
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