Process for improving an anodizing film, an anodizing film structure and an aluminum-alloy-made outboard engine
AssigneesHonda Giken Kogyo Kabushiki Kaisha, Yutaka Giken Co., Ltd.
InventorsYoshiyuki Matsuda, Hiroyuki Murata, Norimasa Takasaki, Morihiro Takemura
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Abstract
A process for forming an improved anodizing film on the surface of an aluminum alloy material. The film is impregnated with an amorphous substance which fills pores formed in the film during its growth. If the film has a flaw reaching the aluminum alloy material, the amorphous substance and aluminum form a layer of passivity which restrains the corrosion of the aluminum alloy material.
Claims15
A process for improving an anodizing film, comprising the steps of:
- forming an anodizing film on a surface of an aluminum alloy material;
- impregnating the film with an amorphous substance capable of forming a layer of passivity with aluminum to fill pores formed in the film during its growth;
- and
- sealing the pores to close their inlets to confine the amorphous substance therein.
An anodizing film structure comprising:
- an anodizing film formed on a surface of an aluminum alloy material;
- zirconium phosphate impregnating the film to fill pores formed therein during its growth;
- and
- a seal closing inlets of the pores.
An aluminum-alloy-made outboard engine comprising:
- an engine cover;
- an under cover attached to the bottom of the engine cover;
- an extension case attached to the bottom of the under cover;
- and
- a gear case attached to the bottom of the extension case, each of at least the extension and gear cases having an anodizing film structure comprising an anodizing film formed on a surface of an aluminum alloy material, zirconium phosphate impregnating the film to fill pores formed therein during its growth, and a seal closing inlets of the pores.
Dependencies are inferred from the claim text.