| 摘要 |
The present invention provides a method of forming a zinc coating that can form a chromate film, capable of withstanding hydrogen embrittlement-preventive treatment, by optimizing the conditions under which chromating is conducted. The method of forming a zinc coating comprises galvanizing the surface of a work composed of an iron-based material, subjecting the surface of the zinc plating layer to trivalent chromate treatment, and subjecting the work to hydrogen embrittlement-preventive treatment. When the work having been subjected to trivalent chromate treatment is taken out of a trivalent chromating bath and is to be dried, the work is not dried at a high temperature but is dried at a temperature of up to 40° C. According to the treatment procedure, the trivalent chromate treatment can form a chromate film capable of withstanding the hydrogen embrittlement-preventive treatment. Accordingly, the work having been galvanized and subjected to trivalent chromate treatment can be subjected to a hydrogen embrittlement-preventive treatment. As a result, a series of plating and chromating steps can be carried out with are plating apparatus, and the production cost can be reduced by reducing the number of the production steps.
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