Steel component with an electroplated anti-corrosive coating and process for producing same
AssigneeINA Walzlager Schaeffler KG
InventorsKarl Ludwig Grell, Reiner Woltmann
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Abstract
A steel component is provided on its surface with an electroplated anti-corrosive coating of a metallic material and has a hardness of at least 650 HV, the anti-corrosive coating being thinner than the surface roughness which the hardened component had before the application of the protective coating. Advantageously, the component is a rolling bearing component with a surface roughness R.sub.z of 0.3 to 9.0 .mu.m and a coating thickness of 0.1 to 3.0 .mu.m. Preferably, the anti-corrosive coating comprises a zinc-cobalt alloy, a zinc-iron alloy or a zinc-nickel alloy coating. It is possible to add iron, tin, copper or chromium to the coating composition.
Claims10
A process for the production of a rolling bearing component with an electrolytically applied anti-corrosive metallic coating on its surface comprising electroplating a hardened rolling bearing component of steel with a Vickers hardness of at least 650 HV and a surface roughness R.sub.z between 0.3 and 9.0 .mu.m to provide the anti-corrosive metallic coating as a ZnCo coating which is thinner than the surface roughness R.sub.z and has a thickness of 0.1 to 3.0 .mu.m.
A process for the production of a rolling bearing component with an electrolytically applied anti-corrosive metallic coating on its surface comprising electroplating a hardened rolling bearing component of steel with a Vickers hardness of at least 650 HV and a surface roughness R.sub.z between 0.3 and 9.0 .mu.m to provide the anti-corrosive metallic coating as a ZnNi coating which is thinner than the surface roughness R.sub.z and has a thickness of 0.1 to 3.0 .mu.m.
A process for the production of a rolling bearing component with an electrolytically applied anti-corrosive metallic coating on its surface comprising electroplating a hardened rolling bearing component of steel with a Vickers hardness of at least 650 HV and a surface roughness R.sub.z between 0.3 and 9.0 .mu.m to provide the anti-corrosive metallic coating as a ZnFe coating which is thinner than the surface roughness R.sub.z and has a thickness of 0.1 to 3.0 .mu.m.
Dependencies are inferred from the claim text.