Hot-tsoma galvanized bututu ana kerarre ta carbon karfe bututu da kuma tutiya shafi. Tsarin ya ƙunshi acid ɗin wanke bututun ƙarfe don cire duk wani tsatsa ko oxidation, tsaftace shi da maganin ammonium chloride, zinc chloride, ko haɗin duka biyu kafin nutsewa a cikin wanka mai zafi mai zafi. Sakamakon galvanized shafi ne uniform, sosai m, kuma yana da babban juriya ga lalata saboda hadaddun jiki da sinadaran halayen da ke faruwa a tsakanin karfe substrate da narkar da tutiya tushen shafi. Gilashin alloy amalgamates tare da tsantsar tutiya mai tsafta da bututun ƙarfe na ƙarfe, yana ba da kyakkyawan juriya ga lalata.
Ana amfani da bututu mai zafi mai zafi a fagage daban-daban kamar gidajen lambun gona, kariyar wuta, samar da iskar gas, da tsarin magudanar ruwa.
