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Abstract

The problem of the present invention is to provide a roughening treatment method in which the surface of stainless steel is sufficiently roughened in an efficient manner with few steps, while maintaining good surface quality of the stainless steel after treatment. The above problem is solved by a roughening treatment method for stainless steel, which comprises a roughening treatment step that uses a first aqueous composition, and a post-treatment step that uses a second aqueous composition. Namely, the roughening treatment step is to roughen the surface of stainless steel containing copper or a metal having an ionization tendency larger than copper by bringing the first aqueous composition into contact with the surface, wherein the first aqueous composition comprises 0.1% to 20% by mass of hydrogen peroxide based on the total amount of the first aqueous composition, 0.25% to 40% by mass of copper ions based on the total amount of the first aqueous composition, and 1% to 30% by mass of halide ions based on the total amount of the first aqueous composition, wherein the post-treatment step is to perform a post-treatment by bringing the second aqueous composition into contact, under acidic conditions, with the surface of the stainless steel that has been treated in the roughening treatment step, and wherein the second aqueous composition comprises at least a peroxide.

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First Claim