Agent for reducing coating film overall friction coefficient for trivalent chromate treating solution, trivalent chromate treating solution and method for production thereof, and trivalent chromate co

Abstract

An agent for reducing a coating film overall friction coefficient for a trivalent chromate treating solution, characterized in that it comprises a quinoline based compound or a derivative thereof. A coating film formed by the contact of a zinc or zinc alloy plating with the trivalent chromate treating solution containing no hexavalent chromium and containing the above agent on the surface of the plating exhibits a corrosion resistance equivalent to that of a coating film formed by a chromate treatment with a treating solution having a conventional hexavalent chromium as a main component, and also exhibits an overall friction coefficient equivalent to or less than that of a coating film formed by a conventional hexavalent chromate.

Description

technical field

[0001] The present invention relates to a technique for reducing the overall coefficient of friction of a hexavalent chromium-free and corrosion-resistant trivalent chromate conversion coating on a zinc or zinc alloy plating layer where fastening ability is required. More specifically, the present invention relates to an agent for reducing the overall coefficient of friction of a conversion coating of a trivalent chromate treatment solution, a trivalent chromate treatment solution for reducing the overall coefficient of friction of a trivalent chromate conversion coating And its preparation method, and the trivalent chromate conversion coating with reduced total friction coefficient and its preparation method. Background technique

[0002] As a method for preventing rusting of metal surfaces, chromate treatment containing hexavalent chromium on zinc or zinc alloy plating has been used in this industrial field. In recent years, increased control of substances...