Muganire kuri 'Passivation' inzira ya 302/304 ikurikirana ibyuma bidafite ibyuma.

Passivation ni imiti ivura impeta zidafite ingese (ASTM A380) zirimo kwibiza mumuti wa acide nitric. Ubu buryo bukuraho 'tramp fer' hejuru yimpeta ishobora kuba yarashizwemo mugihe cyo gutekesha cyangwa gutunganya. Mugukuraho iki cyuma cyubusa, aside itera gushiraho urwego rwinshi, rukingira chromium-oxyde. Kuri 302 na 304 impeta zikoreshwa mugutunganya ibiryo cyangwa ibikoresho byubuvuzi, passivation ningirakamaro kugirango wirinde kwangirika no gutoboka. Bitabaye ibyo, uduce duto twa microscopique twa okiside (ingese) imbere yubushuhe, amaherezo bikaviramo kwangirika kwaho no kunanirwa kwimpeta. Passivation ntabwo ihindura imiterere yubukorikori ariko ni ingenzi kubidukikije.