API 5L Galla Galvanized bututu ne tare da Layer na zinc a saman bututun karfe. Kasancewar zinc na zinc yana ba da bututun galvanized mai kyau acroson juriya. Abubuwan sunadarai na zinc sun fi zafi fiye da baƙin ƙarfe. A cikin muhalli mai lalacewa, zinc zai mutu da baƙin ƙarfe, don haka kare pup ɗin karfe daga lalata.
