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MOLTEN ZINC-ALUMINIUM ALLOY PLATED STEEL PLATE EXCELLENT IN CORROSION RESISTANCE, PHOSPHATE TREATMENT PROPERTY, AND BLACKENING RESISTANCE, AND ITS MANUFACTURE
MOLTEN ZINC-ALUMINIUM ALLOY PLATED STEEL PLATE EXCELLENT IN CORROSION RESISTANCE, PHOSPHATE TREATMENT PROPERTY, AND BLACKENING RESISTANCE, AND ITS MANUFACTURE
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机译：钼锌铝合金镀层钢板耐腐蚀，耐磷酸盐处理性能，耐白化性能优异，其制造
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PROBLEM TO BE SOLVED: To produce a steel plate excellent in the corrosion resistance, phosphate treatment resistance and blackening resistance by cooling the steel plate at the prescribed cooling speed according to the plating bath dipping time alter the molten Zn-Al alloy is plated on the steel plate. ;SOLUTION: A steel plate kept at a temperature of ≤650°C is dipped in a plating bath of the molten Z-Al alloy of 420-500°C containing 2-6wt.% Al to performing the molten Al-Zn plating. The steel plate is cooled so that the cooling speed R satisfies the condition expressed by the formula according to the dipping time (t) where (t) is the dipping time (second) of the steel plate in the plating bath, R is the cooling speed (°C/second) of the plated steel plate from 430°C to the temperature at which the plated layer is solidified. Thus, the molten Zn-Al alloy plated steel plate is obtained, in which the surface layer of the plated layer comprises the continuous β phase, or the β phase and eutectic phase, and the lower surface comprises the eutectic phase, and the exposed area ratio of the β phase in the plated layer surface is ≥60%.;COPYRIGHT: (C)1997,JPO
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