Importance

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Abstract

The present invention aims to provide, under practical chrome plating conditions, a composite hard chrome plating film that suppresses non-adhesive regions between the plating film and ceramic particles, has fewer defects as a film, and is excellent in hardness and wear resistance, and also a sliding member coated with the film. Specifically, provided is a composite hard chrome plating film including tabular alumina, the composite hard chrome plating film being characterized in that the chromium source of the composite hard chrome plating film is trivalent chromium, and the ratio A/B of the amount of acid adsorption A per surface area (μmol/m²) to the amount of base adsorption B per surface area (μmol/m²) of the tabular alumina is 0.5 or more and 1.5 or less.

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First Claim