US Patent 7524115 Rolling bearing

A rolling bearing including an outer member having an inner peripheral surface formed with raceway surfaces of double rows, an inner member having an outer peripheral surface formed with raceway surfaces opposed to the raceway surfaces of the outer member, and double rows of rolling elements interposed between the opposed raceway surfaces. A surface of at least one of the outer member and the inner member that contacts a member made of an aluminum alloy is provided with an electrocorrosion preventive coating containing hexavalent chrome-free chromate.