Sakamakon pickling da passivation a lokacin prefabrication, walda, gwaji, da magani na zafi zai haifar da baƙin ƙarfe oxide, walda slag, maiko, da sauran datti su taru a saman bututun (bututun ƙarfe na carbon, bututun jan ƙarfe, bututun jan ƙarfe, bututun ƙarfe). , wanda zai rage juriya na lalata bututun ƙarfe. Iri-iri. Pickling hanya ce ta kawar da tsatsa ta sinadarai: kawar da tsatsawar acid yawanci tana kawar da oxides na ƙarfe a saman bututun bakin karfe tare da iskar oxygen. Don karafa na ƙarfe, galibi yana nufin baƙin ƙarfe oxide, wanda ke yin maganin waɗannan ƙarfe na ƙarfe kuma yana narkar da su a cikin acid don cimma manufar kawar da tsatsa. Kafin cire tsatsa da tsatsa, yakamata a fara cire mai da ke bangon bututun ƙarfe, saboda kasancewar mai yana hana ruwan tsinken tuntuɓar bangon bututun ƙarfe. Yana shafar tasirin cire tsatsa. Bututun da ba su da mai (kamar bututun bakin karfe don iskar oxygen) dole ne a fara rage man su. Pickling yana nufin yin amfani da maganin tsinke irin su sulfuric acid don wanke Layer oxide da ƙura akan kayan aikin. Phosphating hanya ce ta magani don tsaftace saman.