Process for treating metal surface
AssigneeNippon Dacro Shamrock Co., Ltd.
InventorsNobuhiro Ayukawa, Yasuhiko Konishi
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Abstract
In the process of chromate treatment, a metallic material which has been immersed in a chromate treatment solution is allowed to stand in an atmosphere substantially free from any ingredient of the chromate treatment solution for at least 30 seconds and then washed with a halocarbon or a mixture of a halocarbon and an alcohol the chromate treatment solution before drying. By the procedure chromium is evenly and uniformly taken up on the surface of the metallic material and the amount of chromium taken up on the surface can be controlled by conditions of standing in said atmosphere.
Claims10
An improved process of chromate treatment comprising contacting a metal surface with a chromating solution comprising a chromic acid ingredient, a halocarbon solvent and an alcohol solubilizing agent;
- allowing the thus treated metallic surface to stand in an atmosphere substantially free from any ingredient of said chromating solution for at least 30 seconds;
- thereafter washing the metal surface by contacting with a liquid and/or vapor of a solution substantially consisting of a halocarbon or a halocarbon and an alcohol;
- and drying said surface.
Dependencies are inferred from the claim text.