| 摘要 |
PURPOSE:To improve the corrosion and heat resistances of an aluminized steel sheet by coating a steel sheet to be aluminized with an Al-Si alloy layer after forming a thin Al-Si-Fe-Ni alloy layer having a specified Ni content on the steel sheet. CONSTITUTION:An Al-Si-Fe-Ni alloy layer of 1-7mum thickness having 0.2-30% Ni content is formed on the surface of a steel sheet to be aluminized, and an A-Si alloy coating layer of 3-40mum thickness is formed on the Al-Si-Fe-Ni alloy layer. By the two-layered plating, the characteristics of the resulting aluminized steel sheet such as the corrosion and heat resistances and workability are improved. When an Ni-Fe diffusion layer having >=50% average concn. of Ni is formed before the two-layered plating is formed, the characteristics are further improved. The aluminized steel sheet can be used as a material for an exhaust system, a muffler or the like.
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