VAPOR DEPOSITION DOUBLE LAYER PLATED STEEL SHEET

PURPOSE:To produce a vapor deposition double layer plated steel sheet excellent in corrosion resistance, heat resistance, and workability by successively forming a Ti plating layer, an Al-Ti gradient alloy layer, and an Al plating layer on the surface of a steel sheet. CONSTITUTION:A Ti plating layer is formed as primary layer on the surface of a steel sheet, and an Al-Ti gradient alloy layer in which Al content is gradually increased from the interface with the primary layer toward its surface is formed as secondary layer on the primary layer, and further, an Al plating layer is formed as a third layer on the secondary layer. At this time, Al content on the primary layer side, in the Al-Ti gradient alloy layer, is regulated to =70%. Moreover, the film thicknesses of the Ti plating layer and the Al-Ti gradient alloy layer are regulated to >=0.05mum respectively, and also the film thickness of the Al plating layer is regulated to 0.5mum, and further, the total film thickness is regulated to 0.6-20mum and also the total film thickness of the Ti plating layer and the Al-Ti gradient alloy layer is regulated to