Treatment and after-treatment of metal with polyphenol compounds

Details

Inventors: Lindert, Andreas; Pierce, John R.; McCormick, David R.; Zimmermann, William D.;
Assignee: Henkel Corporation (Ambler, PA)
Primary Examiner: Schofer; Joseph L.
Assistant Examiner: Sarofim; N.
Attorney, Agent or Firm: Szoke; Ernest G., Jaeschke; Wayne C., Wisdom, Jr.; Norvell E.

A metal treatment solution comprising an effective amount of a soluble or dispersible compound which is a derivative of a polyphenol. A composition for treatment and after treatment of metal with polyphenol compounds is provided. The present invention includes novel derivatives of polyphenol compounds which are useful in surface treatment solutions of dispersions. A method for using these solutions or dispersions is also provided. The molecular weight of the polyphenols used to form the derivatives of the present invention are in the range of from about 360 to 30,000 or greater. The resulting derivatives of the present invention typically have a molecular weight of up to about 2,000,000 with molecular weights within the range of about 700 to about 70,000 being preferred.

DETAILED DESCRIPTION OF THE INVENTION In a typical protective metal surface treatment operation employing this invention, the metal to be treated is initially cleaned by a chemical or physical process and then water rinsed to remove grease and dirt from the surface.
The metal surface is then brought into contact with the treatment solution of this invention.
Alternatively, and preferably, instead of contacting the metal surface with the treatment solution of this invention immediately following the cleaning process, a conversion coating solution is applied to or otherwise used to pre-treat the metal surface in a conventional manner to form a conversion coating thereon.
Then the conversion coated surface is water rinsed and the metal surface is brought into contact with the treatment solutions of the present invention.
Although solutions and/or dispersions of the invention can be effectively applied to treated or untreated metal surfaces, speaking generally the present invention is particularly useful if the metal surface has previously been conversion coated and the invention is accordingly used as a post-treatment; accordingly, as used herein, the term "post-treatment" means the treatment of a metal surface which is not bare metal, and preferably has been previously treated with a conventional conversion coating process.
Such conversion coatings are well known and have been described, for example, in Metal Handbook, Volume II, 8th Edition, pp.
529-547 of the American Society for Metals and in Metal Finishing Guidebook and Directory, pp.
590-603 (1972), the contents of both of which are specifically incorporated by reference herein.
The compositions and processes of the present invention are useful in treating a broad range of metal surfaces, including metals having surfaces that have been conversion coated with suitable conversion coatings such as iron phosphate, manganese phosphate, zinc phosphate, zinc phosphate modified with calcium, nickel, or manganese ions.
Examples of suitable metal surfaces include zinc, iron, aluminum and cold-rolled, polished, pickled, and hot-rolled steel and galvanized steel surfaces

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