What is it?
During the pickling process, steel is immersed in an acid tank containing a solution of either hydrochloric or sulfuric acid, which rids the steel of any oxides and mill scale. Furthermore, the pickling process exposes the steel’s bare surface, allowing the galvanized coating to form correctly when immersed in a molten zinc bath. After the steel is pickled, it is usually removed from the bath to avoid over-pickling (especially in sulfuric acid baths) which can cause surface damage, discoloration, and a decrease in size and weight of the steel. In addition, over-pickling may contribute towards a thick galvanized coating.