Patent ID: 6183570
Filing Date: 2001-02-06
Classification: C23C,C23F,C23G

Abstract:
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.