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:
May. 14, 1985
Filed:
Aug. 06, 1984
Tsukasa Yamamoto, Toyota, JP;
Asao Mochizuki, Toyota, JP;
Hiroshi Okita, Nihonbashi, JP;
Toshi Miyawaki, Nihonbashi, JP;
Yoshiji Shirogane, Nihonbashi, JP;
Kazuhiko Mori, Nihonbashi, JP;
Toyota Motor Corp., both of, JP;
Nihon Parkerizing Co., both of, JP;
Abstract
This invention discloses a process for activating steel surface prior to phosphating treatment wherein the steel surface is cleaned, the cleaned steel surface is then treated with an aqueous activating solution containing titanium and pyrophosphate ion, and thereafter the steel surface is treated with a phosphating solution, characterized in that magnesium ion is included in said aqueous activating solution in order to suppress formation of an inactive film on said steel surface due to the presence of said pyrophosphate ion, and then said steel surface is treated with the resulting aqueous activating solution.