Tom qab tshuaj xyuas cov zaj duab xis passive, nws tau pom tias cov kev sib tw chromium yog qhov ntau tshaj plaws muaj ntau yam, ua raws li los ntawm dej, thiab tom qab ntawd hoxaNent chromium. Lwm cov khoom suav suav nrog sulfate, zinc, thiab sodium. Yog li ntawd, nws tuaj yeem xaus tias cov yeeb yaj kiab Chromate feem ntau yog tsim ntawm cov roj ntsha chromium, cov roj ntsha hexavalent chromium, thiab dej, nrog rau cov qauv dav dav:
xCrooso · khuam · zh₂o
Cov chromate muaj nyob rau saum npoo ntawm galvanized txheej nyob rau hauv daim ntawv ntawm colloidal cov tshuaj ntawm chromium chromate (Croa Cr₂oa-YCRORO-YCRORA-ZH₂O). Ntawm qhov tod tes, tom qab rov ua kom zoo nrog zinc, chromic acid yuav zinc automate (zncro₂) thiab txuas rau zaj duab xis. Vim tias nws yog soluble hauv dej, nws coeexists nrog chromic acid nyob rau aqueous txheej deg tom qab yaug rinsing. Nws muaj teeb meem rau cov yeeb yaj kiab. Yog li ntawd, nws yog pom tseeb tias cov chromium tivthaiv nyob rau hauv passive zaj duab xis muab cov nyhuv tiv thaiv kev tiv thaiv.
Lub hauv paus ntsiab lus ntawm kev tiv thaiv corrosion los ntawm passivation zaj duab xis mas dag nyob rau hauv nws cov ntsiab lus siab ntawm troment chromium. Cov zaj duab xis passoluble nyob hauv dej, uas ua zoo li txheej pob zeb thiab noo los ntawm cov cua rau hauv lub galvanized txheej thiab nws qhov pores. Meanwhile, muaj cov nyiaj tsawg ntawm cov neeg siv hluav taws xob tsawg dua pab kho cov yeeb yaj kiab uas ploj mus rau lawv cov txheej txheem anodic ntawm lub galvanized txheej.
