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Kobe Steel Ltd
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Kobe Steel Ltd
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Application filed by Kobe Steel LtdfiledCriticalKobe Steel Ltd
Priority to JP20152387ApriorityCriticalpatent/JPS6447848A/en
Publication of JPS6447848ApublicationCriticalpatent/JPS6447848A/en
PURPOSE:To provide the titled products with high corrosion resistance and excellent chemical conversion treatability by forming specific compsn. of Zn-Al alloy layer on a matrix metal and furthermore coating a Zn-Ti alloy plating layer thereon. CONSTITUTION:The matrix metal such as a cold rolled steel plate, etc., is degreased and the Zn-Al alloy layer contg. 0.5-50% Al and the balance Zn with inevitable impurities is thereafter formed thereon. The plating layer of the Zn-Ti alloy contg. 0.5-20% Ti and the balance Zn with inevitable impurities is furthermore coated thereon. Said composite plated products have excellent corrosion resistance in a bare state as well as after painting and harre excellent chemical conversion treatability. The workability and mechanical characteristics become excellent at the time of forming both alloy layers particularly by vapor deposition plating.