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:
Jan. 04, 1983
Filed:
Jun. 15, 1981
Ronald J Lash, Rochester, MI (US);
David E Crotty, Highland Park, MI (US);
Occidental Chemical Corporation, Warren, MI (US);
Abstract
A process for treating metal surfaces, particularly zinc and zinc alloy surfaces, for depositing a passivate film of improved corrosion resistance and hardness which comprises the steps of providing an aqueous acidic solution containing effective amounts of chromium ions substantially all of which are in the trivalent state, hydrogen ions to provide a pH of about 1.2 to about 2.5, an oxidizing agent, and 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, contacting the substrate with said aqueous acid solution for a period of time sufficient to form a passivate film thereon, preferably water rinsing the passivated substrate, thereafter contacting the passivated substrate with a dilute aqueous rinse solution for a period of at least one second containing a bath compatible water soluble inorganic and/or organic silicate compound present in an amount effective to impart improved corrosion resistance and hardness to the passivate film, and drying the silicate rinsed substrate.
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