ZN-MG ALLOY LAYER COATED STEEL SHEET AND METHOD FOR MANUFACTURING THE COATED STEEL SHEET

摘要

A Zn-Mg alloy coated steel sheet and a method for manufacturing the Zn-Mg alloy coated steel sheet are provided, wherein the Zn-Mg alloy coated steel sheet has more improved adhesion and corrosion resistance by forming an Al-Si alloy film between a base steel sheet and a Zn-Mg alloy film. A Zn-Mg alloy coated steel sheet comprises an Al-Si alloy film which is formed on a base steel sheet and has a thickness of 0.1 to 1.0 mum, and a Zn-Mg alloy film which is formed on the Al-Si alloy film and has a thickness of 0.5 to 10 mum. The Zn-Mg alloy film comprises 10 to 15% by weight of Mg. The Al-Si alloy film is formed by an electron beam method or a sputtering method, and the Zn-Mg alloy film is formed by one method selected from the group consisting of a thermal evaporation method, an electron beam method, a sputtering method, an ion plating method, and an electromagnetic levitation method.