Thawj yog txhuas nws tus kheej, nws cov khoom tsis zoo li hlau, thiab nws tsis yooj yim rau kev hnov mob nrog oxygen hauv qhov. Txawm hais tias alumina ua los ntawm cov tshuaj tiv thaiv yog qhov ruaj khov, tsuas yog xav tau kev saib xyuas los tiv thaiv xeb, thiab cov tshuaj tiv thaiv oxidation tshwm sim ntawm tus nqi qeeb heev. Cov fluorocarbon aluminium veneer ua los ntawm aluminium yog qhov ruaj khov ua ntej kev ua thiab yog ntau tiv taus xeb tom qab ua tiav. Tom qab cov khoom yog passivated, qhov no yog cov qauv kev lag luam uas nquag los tiv thaiv xeb hlau. Nws yog qhov tshuaj tiv thaiv ntawm cov kua hu ua chromate thiab cov khoom ntawm qhov kub kub. Tom qab fluorocarbon aluminium veneer yog ntxuav tu, ib txheej chromium yog tsim nyob rau saum npoo ntawm cov khoom. Lub chromium txheej muaj qhov ua kom zoo thiab tiv thaiv cov khoom ntawm cov khoom tsis zoo. Vim tias chromium yog cov hlau ruaj khov, nws tsim cov txheej txheej tiv thaiv kom tiv taus cov kua qaub thiab alkalis.
Tom qab passivation, nws kuj undergoes fluorocarbon txheej tshuab. Cov tshuaj fluorocarbon yog hais txog cov khoom siv tshuaj ntawm cov khoom siv tshuaj hu ua polyvinylidene chloride cob. Cov txheej tsim los ntawm nws yog qhov ruaj khov dua, tsis ntshai dej, tsis ntshai tshav ntuj, tsis ntshai kev hloov pauv kub, thiab yuav tsis deform lossis ploj mus ntev. Tus naj npawb ntawm kev txau yog feem ntau peb lossis plaub zaug. Qhov kev txiav txim tau muab coj los xyuas kom meej tias daim paib txhuas thiab cov huab cua sab nraud tag nrho tuaj yeem ua cov tshuaj cuam tshuam nrog nws cais tawm. Qhov no yog vim li cas fluorocarbon aluminium veneer tsis xeb.
Cov khoom ua tau zoo los ntawm kev ua tiav ntau txheej txheej yog qhov ruaj khov heev, thiab nws tau dav siv hauv tsev lag luam thiab tsev kho kom zoo nkauj. Nws yog cov khoom siv hauv tsev feem ntau siv.
