COMPOSITE NICKEL-PHOSPHORUS ALLOY PLATED METAL SHEET EXCELLENT IN STRIPPABILITY AND HAVING HIGH HARDNESS AND METHOD FOR MANUFACTURING SAME

摘要

COMPOSITE NICKEL-PHOSPHORUS ALLOY PLATED METAL SHEET EXCELLENT IN STRIPPABILITY AND HAVING HIGH HARDNESS AND METHOD FOR MANUFACTURING SAME A composite nickel-phosphorus alloy plated metal sheet excellent in strippability and having a Vickers hardness of at least 500 Hv, which comprises: a composite nickel-phosphorus alloy plating layer as a lower layer, formed on at least one surface of a metal sheet, in which Ni3P particles and fluorocarbon polymer particles are uniformly dispersed; and a fluorocarbon polymer layer as an upper layer formed by melting the fluorocarbon polymer particles which are exposed on the surface of the composite nickel-phosphorus alloy plating layer as the lower layer. The sum of a phosphorus content in the composite nickelphosphorus alloy plating layer as the lower layer and a phosphorus content in the Ni3P particles is from 1 to 15 wt.% relative to the composite nickel-phosphorus alloy plating layer as the lower layer, and a content of the fluorocarbon polymer particles in the composite nickelphosphorus alloy plating layer as the lower layer is from 0.3 to 15.2 wt.% relative to the composite nickelphosphorus alloy plating layer as the lower layer.