Answer
Passivation magani ne na sinadari wanda aka yi niyya don cire baƙin ƙarfe kyauta daga saman bakin karfe, yana haɓaka Layer chromium-oxide mai kariya. Don zoben riƙewa na karkace a cikin magani ko amfani da ruwa, AMS 2700 (Hanyar 1 ta amfani da Nitric Acid ko Hanyar 2 ta amfani da Citric Acid) shine ma'auni. 316 Bakin Karfe, mai ɗauke da $2$-$3\%$ Molybdenum, yana ba da juriya mafi girma idan aka kwatanta da 302/304. A lokacin murɗa zoben karkace, kayan aikin yana da ƙarfi, kuma gefuna na iya samun gurɓataccen ƙarfe na ƙarfe daga kayan aiki. Citric acid passivation yana ƙara fifita saboda yana da aminci ga muhalli kuma ya fi zaɓi wajen cire baƙin ƙarfe kyauta kawai, yana tabbatar da cewa $360 ^{\circ}$ karkace saman ya kasance marar amfani a cikin mahalli masu wadatar chloride.
