Protective coating process for aluminum and aluminum alloys
First Claim
1. A protective coating process for aluminum and aluminum alloy components comprising the steps of:
- anodizing the component to be coated;
applying a coating composition comprising a water soluble acrylic polymer or copolymer and a nitrogenous cross-linking agent to the anodized component at a temperature in the range of approximately 170°
F. to 200°
F. for a period ranging from about 30 to 60 minutes, the time and temperature being inversely related whereby said composition seals the anodized component through hydration and simultaneously primes the anodized component providing a surface coating capable of being cross-linked during a subsequent curing operation; and
curing the sealed and primed component at a temperature in the range of approximately 200°
F. to 500°
F. for approximately 1 to 60 minutes, the time and temperature being inversely related.
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Abstract
A process is described for sealing anodic coatings on aluminum and the alloys of aluminum while simultaneously impregnating the anodic coating with organic resin during the sealing operation, thereby providing a protective coating to the anodized aluminum which, among other things has superior corrosion resistant characteristics.
A specified water-borne resin coating material possessing excellent stability at temperatures in excess of 200° F. is used to convert the unsealed anodic coating to the monohydrate/trihydrate form of aluminum oxide during the sealing step of an otherwise conventional aluminum anodizing process. Subsequently, the sealed anodic film is cured at temperatures up to 500° F. This process provides a total protection system having characteristics superior to separately sealed and organically primed aluminum obtained through conventional processing.
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Citations
7 Claims
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1. A protective coating process for aluminum and aluminum alloy components comprising the steps of:
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anodizing the component to be coated; applying a coating composition comprising a water soluble acrylic polymer or copolymer and a nitrogenous cross-linking agent to the anodized component at a temperature in the range of approximately 170°
F. to 200°
F. for a period ranging from about 30 to 60 minutes, the time and temperature being inversely related whereby said composition seals the anodized component through hydration and simultaneously primes the anodized component providing a surface coating capable of being cross-linked during a subsequent curing operation; andcuring the sealed and primed component at a temperature in the range of approximately 200°
F. to 500°
F. for approximately 1 to 60 minutes, the time and temperature being inversely related. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification