MAGNESIUM-ALUMINUM COATED STEEL SHEET AND MANUFACTURING METHOD THEREFOR

摘要

Provided is a steel sheet having a magnesium-aluminum alloy coating layer having excellent corrosion resistance, formed using galvanic coupling, and the steel sheet having a magnesium-aluminum alloy coating layer comprises a steel sheet, a first magnesium-aluminum alloy layer formed on the upper part of the steel sheet, and a coating layer formed with a second magnesium-aluminum alloy layer formed on the upper part of the first magnesium-aluminum alloy layer, wherein the magnesium content in the first magnesium-aluminum alloy layer is higher than the magnesium content in the second magnesium-aluminum alloy layer.