Process for forming a bearing surface for aluminum alloy
First Claim
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1. A process for producing a uniform, highly adherent anodized aluminum layer on a surface of a cast aluminum alloy article, comprising the steps:
- peening a surface of the article to create a peened surface with increased density of non-aluminum constituents at the peened surface;
selectively etching the peened surface of the article to remove non-aluminum constituents from the peened surface to create an etched surface so that aluminum concentration at the etched surface is higher than in an interior region of the article;
anodizing the etched surface to produce an anodized layer;
polishing the surface to remove an outermost 20 to 30% of the anodized layer; and
washing the surface with a pseudo-boehmite inhibiting agent.
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Abstract
A process for forming a bearing surface on an aluminum alloy article including the steps peening the surface, anodizing the surface, and washing the anodized surface with a boehmite inhibiting agent.
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Citations
22 Claims
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1. A process for producing a uniform, highly adherent anodized aluminum layer on a surface of a cast aluminum alloy article, comprising the steps:
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peening a surface of the article to create a peened surface with increased density of non-aluminum constituents at the peened surface; selectively etching the peened surface of the article to remove non-aluminum constituents from the peened surface to create an etched surface so that aluminum concentration at the etched surface is higher than in an interior region of the article; anodizing the etched surface to produce an anodized layer; polishing the surface to remove an outermost 20 to 30% of the anodized layer; and washing the surface with a pseudo-boehmite inhibiting agent. - View Dependent Claims (2, 3, 4, 5)
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6. A process for producing a uniform, highly adherent anodized aluminum layer on a surface of an aluminum alloy article, comprising the steps:
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peening a surface of the article to produce a peened surface; selectively etching the peened surface of the article to remove elements other than aluminum to produce an etched surface so that aluminum concentration at the etched surface is higher than in an interior region; anodizing the etched surface to form an anodized layer; washing the anodized layer with a boehmite inhibiting agent; polishing the anodized layer, such that the polishing step removes an outermost portion of the anodized layer to form a polished anodized layer; and washing the polished anodized layer with a boehmite inhibiting agent. - View Dependent Claims (7, 8, 9, 10)
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11. A process for producing a uniform, highly adherent anodized aluminum layer on a surface of an aluminum alloy article, comprising the steps:
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peening a selected portion of a surface to create a peened surface with increased density of non-aluminum constituents at the peened surface; selectively etching the peened surface of the article to remove elements other than aluminum to produce an etched surface so that aluminum concentration at the etched surface is higher than in an interior region; anodizing the etched surface to produce an anodized layer; polishing the anodized layer, such that the polishing step removes an outermost portion of the anodized layer to form a polished anodized layer; and washing the polished anodized layer with a boehmite inhibiting agent. - View Dependent Claims (12, 13, 14)
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15. A process for producing a uniform, highly adherent anodized aluminum layer on a surface of an aluminum alloy article, comprising the steps:
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peening a surface of the article to produce a peened surface; selectively etching the peened surface of the article by exposing the peened surface to an HF or fluoride ion containing solution; anodizing the etched surface to produce an anodized layer; polishing the anodized layer, such that the polishing step removes an outermost portion of the anodized layer to produce a polished anodized layer; and washing the polished anodized layer with a boehmite inhibiting agent. - View Dependent Claims (16, 17, 18, 19)
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20. A process for producing a uniform, highly adherent anodized aluminum layer on a surface of an aluminum alloy article, comprising the steps:
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peening a surface of the article to produce a peened surface; selectively etching the peened surface of the article to remove elements other than aluminum to produce an etched surface so that aluminum concentration at the etched surface is higher than in an interior region; anodizing the etched surface to form an anodized layer; washing the anodized layer with an H3 PO4 solution; polishing the anodized layer, such that the polishing step removes an outermost portion of the anodized layer to produce a polished anodized layer; and washing the polished anodized layer with an H3 PO4 solution. - View Dependent Claims (21, 22)
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Specification