Studies on Zn/Mn Electroplated Steel Sheets

Abstract

As a result of extensive study, a new Zn (under layer)/Mn (top layer) coated steel sheet having excellent corrosion resistance, formability and weldability has been developed. The corrosion resistance of this dual coating is superior to those of other single layer coatings or alloy coatings especially in the environment of salt water.
The layers of Zn and Mn, being electrochemically baser than steel, protect the steel substrate effectively. Besides it has been confirmed that the corrosion products of Mn form a sort of film which acts as a protective barrier.