TRIVALENT CHROMIUM CHEMICAL CONVERSION COATING FILM TRATMENT AGENT, TRIVALENT CHROMIUM CHEMICAL CONVERSION COATING FILM TRATMENT METHOD, AND TRIVALENT CHROMIUM CHEMICAL CONVERSION COATING FILM TRATED PRODUCT

摘要

PROBLEM TO BE SOLVED: To provide a technology capable of forming a uniform , beautiful-appearance and highly corrosion-resistant trivalent chromium chemical conversion coating film without needing any strong etching in a chemical conversion even on a metal, which is liable to cause smut on a base material surface by the strong etching in a conventional treatment such as zinc, a zinc-based alloy or the like.;SOLUTION: The trivalent chromium chemical conversion coating film treatment agent contains (1) a trivalent chromium compound and a cobalt compound, (2) at least one feed source selected from chlorine ion, nitrate ion and sulphate ion, and (3) organic acid or organic acid salt, and further contains (4) at least one selected from allylamine, polyallylamine, aromatic sulfonic acid, aromatic sulfonic acid-formaldehyde condensate, and a derivative thereof. The metal surface treatment method uses the trivalent chromium chemical conversion coating film treatment agent.;COPYRIGHT: (C)2008,JPO&INPIT