Surface treatment process of metallic material and metallic material obtained thereby
AssigneeNihon Parkerizing Co., Ltd.
InventorsJun Kawaguchi, Hiroyuki Iizuka
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Abstract
There is provided a surface treatment method of metal that can endow the surface of a metallic material with strong bonding force in a simple process regardless of the profile and the substance of the metallic material as well as a metallic material obtained by such a method. The method comprises a first step of conducting a chemical etching process accompanied by formation of a film coat on the metal surface and a second step of chemically removing the film coat formed on the metal surface in the first step. If necessary, it may further comprise a third step of forming a thin layer on the metal surface after the second step.
Claims7
A surface treatment process of a stainless steel surface comprising a first step in which etching pits are produced on said stainless steel surface accompanied with a formation of a film coat on said stainless steel surface by contacting said stainless steel surface with a first aqueous solution, said first aqueous solution comprising oxalic acid ion and hydrofluoric acid ion;
- and a second step in which the film coat is removed by contacting said stainless steel surface with a second aqueous solution, said second aqueous solution comprising a mixture of nitric acid and hydrofluoric acid, wherein said first step and said second step result in said stainless steel surface having a surface roughness of RZ:
- 1.5 to about Rz:
- 15.
Dependencies are inferred from the claim text.