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:
Sep. 01, 1992
Filed:
Nov. 01, 1991
Applicant:
Inventor:
Mervet S Boulos, Troy, MI (US);
Assignee:
Henkel Corporation, Ambler, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
C23C / ;
U.S. Cl.
CPC ...
148247 ; 148271 ; 148273 ;
Abstract
An aqueous liquid combination of simple and complex fluorides, a chelating agent for iron, phosphate ions, a hydroxylamine source, and an oxidizing agent selected from among water soluble nitroaromatic organic compounds, molybdates, and tungstates, provides good quality protective phosphate conversion coatings on ferrous, zinciferous, aluminous, and magnesium and magnesium alloy metal surfaces, without needing any divalent or higher valent metal cations such as are generally used to produce high quality phosphate conversion coatings. If the combination includes suitable surfactants, no prior chemical cleaning of the metal to be treated is required for good results.