Anodizing treatment method and structure of internal combustion engine
First Claim
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, andwherein the second anodic oxide coating has a random orientation by AC-DC superimposition electrolysis.
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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.
26 Citations
5 Claims
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1. A structure of an internal combustion engine, comprising at least:
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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, andwherein the second anodic oxide coating has a random orientation by AC-DC superimposition electrolysis. - View Dependent Claims (2, 3, 4, 5)
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Specification