Answer
Passivation magani ne na sinadarai don zoben karkace na bakin karfe (ASTM A380) wanda ya haɗa da nutsewa cikin maganin nitric acid. Wannan tsari yana cire 'karfe-karfe' daga saman zoben wanda watakila an saka shi yayin aikin nadi ko sarrafa. Ta hanyar cire wannan baƙin ƙarfe na kyauta, acid ɗin yana haɓaka samuwar wani yanki mai yawa, mai kariya na chromium-oxide. Don jerin zoben 302 da 304 da aka yi amfani da su wajen sarrafa abinci ko kayan aikin likita, wucewa yana da mahimmanci don hana tsatsawar ƙasa da rami. Idan ba tare da shi ba, ƙananan ƙwayoyin baƙin ƙarfe za su oxidize (tsatsa) a gaban danshi, a ƙarshe yana haifar da lalata da kuma yuwuwar gazawar zobe. Passivation baya canza kayan inji na karfe amma yana da mahimmanci don dorewar muhallinsa.
