Anodizing treatment method and structure of internal combustion engine

• US 10,458,034 B2
• Filed: 03/26/2015
• Issued: 10/29/2019
• Est. Priority Date: 03/27/2014
• Status: Active Grant

• Current Assignee: Suzuki Motor Corporation
• Original Assignee: Suzuki Motor Corporation
• Inventors: Murakami, Haruhiko, Fujita, Masahiro
• Primary Examiner(s): Ripa, Bryan D.
• Assistant Examiner(s): Chung, Ho-Sung
• Application Number:
  US14/776,472
• Publication Number:
  US 20160138179A1
• Time in Patent Office: 1,678 Days
• Field of Search: 428212, 4283122, 428469-4722
• CPC Class Codes: C25D 11/024 Anodisation under pulsed or modulated current or potential
• CPC Class Codes: C25D 11/04 of aluminium or alloys based thereon
• CPC Class Codes: C25D 11/06 characterised by the electrolytes used
• CPC Class Codes: C25D 11/08 containing inorganic acids
• CPC Class Codes: C25D 11/12 Anodising more than once, e.g. in different baths
• CPC Class Codes: C25D 11/246 for sealing layers
• CPC Class Codes: F02F 1/18 Other cylinders
• CPC Class Codes: F02F 1/24 Cylinder heads
• CPC Class Codes: F02F 3/0084 the pistons being constructed from specific materials
• CPC Class Codes: F02F 3/14 within combustion chambers

Abstract

Provided are a method for an anodizing treatment on an aluminum-based material and a structure of an internal combustion engine which are provided with both high heat insulation properties and a high corrosion resistance, a high durability and a high impact resistance, and high water-repellent and oil-repellent functions. This method comprises the steps of: forming a second anodic oxide coating 2b by application of AC-DC superimposition electrolysis to an aluminum-based material 1; and, after the step, forming a first anodic oxide coating 2a by application of direct-current electrolysis to the aluminum-based material 1, wherein the second anodic oxide coating 2b is formed on the first anodic oxide coating 2a.

Claims

1. A structure of an internal combustion engine, comprising at least:

a first anodic oxide coating on a surface of an aluminum-based material constituting a combustion chamber in an internal combustion engine; and

a second anodic oxide coating on a surface of the first anodic oxide coating,

wherein the first anodic oxide coating has more pores therein than the second anodic oxide coating, and a film thickness of the first anodic oxide coating is greater than a film thickness of the second anodic oxide coating,

wherein the film thickness of the second anodic oxide coating is 10 μ

m to 100 μ

m, and a total film thickness of the first anodic oxide coating and the second anodic oxide coating is greater than or equal to 50 μ

m, and

wherein the second anodic oxide coating has a random orientation by AC-DC superimposition electrolysis.

2. The structure of an internal combustion engine according to claim 1,

wherein the first anodic oxide coating has a porosity of 25% to 75%.

3. The structure of an internal combustion engine according to claim 1, wherein the total film thickness of the first anodic oxide coating and the second anodic oxide coating is 50 μ

m to 500 μ

m.

4. The structure of an internal combustion engine according claim 1, wherein the first anodic oxide coating is obtained by application of direct-current electrolysis, and the second anodic oxide coating is obtained by application of AC-DC superimposition electrolysis.

5. The structure of an internal combustion engine according to claim 1, wherein silicon and nano-level pores derived from the silicon are present in the first anodic coating.