Patent ID: 6596410
Filing Date: 2003-07-22
Classification: C25D,F16C,Y10S,Y10T

Abstract:
A chrome-plated sliding member comprising a substrate and a hard chrome plating film comprising an outer surface and at least two hard chrome plating layers at least one of which forms the interface with the substrate, whereinmicrocracks in an originating layer opening to the outer surface of said hard chrome plating layers are distributed in the individual hard chrome plating layers; each hard chrome plating layer comprises portions where the microcracks stop within the originating layer, and portions where the microcracks propagate in a depth direction into the hard chrome plating layer under the originating layer; and quantities of microcracks as expressed by area ratios of microcracks in a cross-section of said hard chrome plating film comprise a quantity of the portions where the microcracks stop within the originating layer within a range of from 1.5 to 35.0%, a quantity of the portions where the microcracks propagate into the hard chrome plating layer under the originating layer within a range of from 0.5 to 25.0%, and a total quantity of microcracks within a range of from 2.0 to 40.0%.