RUST-PREVENTIVE STRUCTURE FOR AUTOMOBILE

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PROBLEM TO BE SOLVED : To provide a rust preventive structure for automobiles with which spot weldability and corrosion resistance are made compatible with each other.SOLUTION : In the sill structure formed by holding a reinforcement 1 with a sill outer 2 and a sill inner 3 and subjecting these parts to spot welding 4, the reinforcement 1 is produced by a plated steel plate provided with a Zn-Al-Mg alloy plating layer of 1 to 5 mass% M, and 3 to 22 mass% Al, and if necessary, 0.000 to 0.1 mass% Ti, and 0.0005 to 0.01 mass% B. The Zn-Al-Mg alloy plating layer contains, in some cases, 0.002 to 0.05 mass% at least one kind of the easily oxidizable element selected from Zr, Y, Si and rare earth elements, and is disposed on the surface of the steel plate at a coating weight of ≥180 g/m2 in total of both surfaces.COPYRIGHT : (C)2007, JPO&INPIT