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:
Apr. 04, 1989
Filed:
Sep. 24, 1987
Takenori Deguchi, Shisui, JP;
Masaru Suzuki, Izumisano, JP;
Sanae Watanabe, Matsudo, JP;
Kazuko Uchida, Funabashi, JP;
Nisshin Steel Co., Ltd., Tokyo, JP;
Abstract
Disclosed is a hot dip coated steel sheet obtained by hot dipping a steel sheet in a hot-dip metal bath comprising zinc-based or zinc/aluminum based alloy, and a process for producing the same. The hot dip coated steel sheet has a film of oxides which are compounds of cobalt or iron, or both of these, with oxygen, and the film can prevent the hot dip coated steel sheet from undergoing color change into grayish black in the case where spangles are minimized, where a coating contains corrosion resistance-improving elements such as magnesium and aluminum, or where a chromate treatment is applied after the mechanical processings were carried out. Formation of oxide film on the surface of the hot dip coated steel sheet is carried out by a method in which an aqueous solution obtained by dissolving a salt of cobalt or a salt of iron or both of these is sprayed on the surface of a coating of the steel sheet when the temperature of the coating is 170.degree. C. or higher. The salt is preferably a nitrate or a chloride for both the salt of cobalt and the salt of iron.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile