The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 16, 1982
Filed:
Jun. 17, 1981
David E Crotty, Highland Park, MI (US);
Occidental Chemical Corporation, Warren, MI (US);
Abstract
An aqueous acidic solution and process for treating metal surfaces, particularly zinc and zinc alloy surfaces, for depositing a passivate film to impart improved corrosion resistance thereto. The solution contains effective amounts of chromium ions substantially all of which are present in the trivalent state, hydrogen ions to provide a pH of about 1.2 to about 2.5, an oxidizing agent, a stabilizing agent comprising a mixture of 1--hydroxy ethylidene--1,1 diphosphonic acid and citric acid as well as the bath soluble and compatible salts thereof present in an amount effective to stabilize the oxidizing agent and pH of the aqueous acidic solution, and at least one additional metal ion selected from the group consisting of iron, cobalt, nickel, molybdenum, manganese, aluminum, lanthanum, cerium, lanthanide mixture as well as mixtures thereof. The treating solution may optionally further contain a bath soluble and compatible silicate compound, halide ions, a carboxylic acid or salt thereof and a wetting agent.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile