Steel sheet coated with chemical conversion film and process for producing the same

• US 20060228568A1
• Filed: 03/24/2006
• Published: 10/12/2006
• Est. Priority Date: 03/25/2005
• Status: Abandoned Application

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Saito, Hiroshi, Ishikawa, Kenichiro
• Application Number:
  US11/387,757
• Publication Number:
  US 20060228568A1
• Time in Patent Office: Days
• US Class Current: 428/450
• CPC Class Codes: B32B 15/06 of natural rubber or synthetic rubber
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: B32B 15/18 comprising iron or steel B32B15/011, B32B15/012 and B32B15/013 take precedence
• CPC Class Codes: B32B 15/20 comprising aluminium or copper B32B15/016 and B32B15/017 take precedence
• CPC Class Codes: B32B 2307/306 Resistant to heat
• CPC Class Codes: B32B 2307/714 Inert, i.e. inert to chemical degradation, corrosion
• CPC Class Codes: B32B 25/14 comprising synthetic rubber copolymers B32B25/18 and B32B25/20 take precedence
• CPC Class Codes: B32B 2581/00 Seals; Sealing equipment; Gaskets
• CPC Class Codes: C23C 22/74 for obtaining burned-in conversion coatings
• CPC Class Codes: F16J 15/122 generally parallel to the surfaces

Abstract

The present invention provides a process for producing a steel sheet coated with a chemical conversion film, comprising: coating either one side or both sides of a steel sheet with a treating liquid comprising silica particles and an acid ingredient; and drying the applied treating liquid by heating to thereby form a coating film comprising a reaction product of the silica, the acid ingredient and one or more metals in the steel sheet.

Claims

1. A process for producing a steel sheet coated with a chemical conversion film, comprising:

coating either one side or both sides of a steel sheet with a treating liquid comprising silica particles and an acid ingredient; and

drying the applied treating liquid by heating to thereby form a coating film comprising a reaction product of the silica, the acid ingredient and one or more metals in the steel sheet.

2. The process for producing a steel sheet coated with a chemical conversion film of claim 1, wherein the content of the acid ingredient in the treating liquid is 20 to 80% by weight.

3. The process for producing a steel sheet coated with a chemical conversion film of claim 1, wherein the acid ingredient comprises at least one member selected from the group consisting of phosphoric acids, acetic acid, formic acid, sulfuric acid, nitric acid, hydrofluoric acid, fluorocomplexes and organic acids.

4. The process for producing a steel sheet coated with a chemical conversion film of claim 1, wherein the steel sheet is an aluminum steel sheet or an iron steel sheet.

5. A steel sheet coated with a chemical conversion film, which is obtained by the process of claim 1 and which comprises:

a steel sheet; and

a coating film, formed either one side or both sides of the steel sheet, comprising a reaction product of the silica, the acid ingredient and one or more metals in the steel sheet.

6. A material for a gasket, comprising the chemical conversion film-coated steel sheet of claim 5.

7. A material for a washer, comprising the chemical conversion film-coated steel sheet of claim 5.