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. 02, 1993
Filed:
Feb. 21, 1991
Mazda Co., Ltd., Osaka, JP;
Abstract
The present invention relates to a phosphating method and solution for forming on a metal surface a phosphate film, which are used for elevating coating finish and rust-preventive property when a product consisting essentially of steel and/or zinc-plated steel combined with an aluminum alloy is coated with cationic electrocoating. The method and solution comprise that said metal surface is brought, to form a coating film, in contact with an aqueous phosphate solution which satisfies the following conditions with respect to the six kinds of ions contained. A total concentration of a sodium ion and a potassium ion is in a range of 2.0 to 15.0 (g/l). A total concentration of a manganese ion and a nickel ion is in a range of 1.0 to 5.0 (g/l). Concentration of a zinc ion is in a range of (1.6-0.02 T) to (2.5-0.02 T) (g/l). Concentration of a free F.sup.- ion is in a range of 8.0 T.sup.-1 to 20.0 T.sup.-1 (g/l), (here, T is temperature (.degree.C.) of a phosphating solution and in a range of 20 to 60). Contact of the metal surface with the phosphate solution is carried out with a combined process of dipping treatment subsequently followed by spraying treatment.