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:
Mar. 25, 1986
Filed:
Nov. 14, 1984
David E Crotty, Highland Park, MI (US);
OMI International Corporation, Warren, MI (US);
Abstract
An aqueous acidic peroxide-free solution and process for treating receptive metal surfaces to impart a chromium passivate film thereon containing 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, at least one additional metal ion selected from the group consisting of iron, cobalt, nickel, molybdenum, manganese, aluminum, lanthanum, cerium, lanthanide mixtures as well as mixtures thereof present in an amount effective to activate the formation of the chromate passivate film and nitrate ions as the essential oxidizing agent present in an amount to provide a mol ratio of nitrate ions to chromion ions and activating metal ions of at least about 4:1 and sufficient to activate the hydrated trivalent chromium to form a chromate film on the substrate. The aqueous acidic solution can optionally, and preferably further contain controlled amount of sulfate ions, halide ions, organic carboxylic acids, a bath soluble and compatible silicate compound, and one or a combination of wetting agents to further enhance the characteristics of the passivate film produced.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile