Treatment Liquid for Black Trivalent Chromium Conversion Coating, Trivalent Chromium-Containing Water-Soluble Liquid for Finishing Treatment, and Treatment Method of Metal Substrate

摘要

Provided are a treatment liquid for a black trivalent chromium conversion coating, and a trivalent chromium-containing water-soluble liquid for finishing treatment, achieving excellent corrosion resistance and scratch resistance without containing a cobalt compound, with high stability and adequate consideration for environmental issues; and a method for treating a metal substrate using the same. The treatment liquid for a black trivalent chromium conversion coating on the surface of a metal substrate contains a trivalent chromium compound, two or more organic acids or organic acid salts, or one or more organic sulfur compounds, and nitrate ions, and contains no cobalt compound.

主权项

1. A treatment liquid for a black trivalent chromium conversion coating on the surface of a metal substrate, wherein the treatment liquid comprises:
a trivalent chromium compound; two or more organic acids or organic acid salts, or one or more organic sulfur compounds: and nitrate ions, wherein the treatment liquid is free of a cobalt compound.