In the galvanic cells of the tin, iron is negative and oxidized because iron is more active than tinTherefore, in the coating damage after corrosion. Than tin tin
When the coating is damaged and the surrounding water, oxygen and other primary cell. Zinc is the anode oxidized tin iron is positive, do not participate in the reaction is protected by zinc than iron. Lively, active metal is negative.
Galvanized iron: galvanized iron for daily use, such as box, water pipe, etc.Tin: tin plated iron. Usually used for food packaging. Such as canned goods
