Surface treatment process for magnesium-based material

• US 20060093744A9
• Filed: 07/08/2005
• Published: 05/04/2006
• Est. Priority Date: 07/12/2004
• Status: Abandoned Application

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Suzuki, Hideyuki, Kawaguchi, Hiroshi, Sato, Koichiro, Okazaki, Keiichi, Ito, Tomoko
• Application Number:
  US11/178,190
• Publication Number:
  US 20060008587A1
• Time in Patent Office: Days
• US Class Current: 427/377
• CPC Class Codes: C23C 22/00 Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
• CPC Class Codes: C23C 22/73 characterised by the process

Abstract

A process for providing a coating on a surface of a substrate made of magnesium or magnesium alloy has a step of heating the substrate in a humidified atmosphere therein. It is desirable that the atmosphere has a temperature between 50 and 450 degrees centigrade and a relative humidity between 50 and 100%. It is also desirable that the atmosphere has a pressure between 1.0×10⁵ and 1.0×10⁶ Pa. Further, it is desirable that a thickness of the coating is between 3 and 50 μm. The surface treatment process is suitable for forming a vehicular part such as an ECU case.

Claims

1. A process for providing a coating on a surface of a substrate made of magnesium or magnesium alloy comprising a step of heating the substrate in a humidified atmosphere.

2. The process according to claim 1, wherein:

the atmosphere has a temperature between 50 degrees centigrade and 450 degrees centigrade and a relative humidity between 50% and 100%.

3. The process according to claim 1, wherein the atmosphere has a pressure between 1.0×

10⁵ Pa and 1.0×

10⁶ Pa.

4. The process according to claim 1, wherein a thickness of the coating is between 3 μ

m and 50 μ

m.

5. The process according to claim 1, wherein the substrate is shaped for a part of a vehicle.