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:
Oct. 11, 1977
Filed:
Aug. 25, 1975
Shoji Oka, Nara, JA;
Tamotsu Sobata, Osaka, JA;
Teturo Kishimoto, Izumiotsu, JA;
Kazuo Nobe, Kyoto, JA;
Nippon Paint Co., Ltd., , JA;
Abstract
Zinc phosphate coating solution contains phosphate ions in an amount of at least 0.5 percent by weight and in the phosphate ion to nitrate ion molar weight ratio of from 1 : 0.7 to 1 : 1.3. This solution also contains zinc ions in an amount, preferably, of at least 0.03 percent by weight and in a ratio of zinc ion to phosphate ion of less than 0.116 to 1. Nickel ions may be added in an amount of at least 0.01 percent by weight and in the nickel ion to zinc ion ratio of less than 1.89 to 1. The pH value of this solution ranges from about pH 3.3 to pH 3.8, whereby the consumption of nitrites employed as accelerators is reduced and sludges are formed in less amounts as in the form easily removable from an apparatus where the phosphating is effected. The zinc phosphate coating solution is preferably employed for an apparatus in which little or no solution is discharged out of the phosphating system.