| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of forming a zinc film by which a chromate film capable of withstanding hydrogen embrittlement removal treatment can be formed by optimizing the conditions of chromate treatment. SOLUTION: In the method of forming a zinc film, the surface of a work consisting of an iron based stock is galvanized, thereafter, the plated surface is subjected to trivalent chromate treatment, and then, hydrogen embrittlement removal treatment is performed. In the trivalent chromate treatment, when the work is discharged from a trivalent chromate bath and is dried, not high temperature drying but drying at≤40% is performed. By this treatment method, a chromate film capable of withstanding the hydrogen embrittlement removal treatment can be formed by the trivalent chromate treatment, so that, after the application of the galvanizing to the work, the trivalent chromate treatment is performed, and then the hydrogen embrittlement removal treatment can be performed. As a result, the plating treatment and the chromate treatment can be performed in a series of process, so that the reduction in cost owing to the reduction in the treatment process can be attained. COPYRIGHT: (C)2004,JPO
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