Claims
- 1. A method for providing an abrasion resistant conversion coating on an aluminum surface of a swashplate for a swashplate compressor, comprising the steps of:(a) providing said aluminum surface which has been treated by thermal degreasing or aqueous alkaline degreasing to be substantially devoid of grease and oils; and (b) contacting the treated surface with an aqueous bath solution of 2.0-25.0 wt % KF at a temperature of 90° F.-212° F. for at least 5 seconds to provide a conversion coating on said surface consisting essentially of: (i) substantially all K3AlF6 or (ii) a mixture comprising a major proportion of K3AlF6 and a minor proportion of KAlF4.
- 2. The method according to claim 1 wherein said surface aqueous alkaline degreasing comprises exposing said surface to an aqueous solution of sodium hydroxide or potassium hydroxide.
- 3. The method according to claim 1 wherein said thermal degreasing comprises exposing said surface to a vaporized evaporative oil.
- 4. The method according to claim 1 wherein said KF bath concentration is 2.5-5%.
- 5. The method according to claim 1 wherein said KF bath concentration is 2.5-3.5%.
- 6. The method according to claim 1 wherein said bath temperature is 120-150° F.
- 7. The method according to claim 6 wherein said bath temperature is less than 150° F.
- 8. The method according to claim 7 wherein said bath temperature is 120-145° F.
- 9. The method according to claim 8 wherein said bath temperature is 130-145° F.
- 10. The method according to claim 1 wherein said aluminum surface comprises a surface of an aluminum alloy.
- 11. A method for providing an abrasion resistant conversion coating on an aluminum surface, comprising the steps of:(a) providing said aluminum surface which has been treated by thermal degreasing or aqueous alkaline degreasing to be substantially devoid of grease and oils; (b) contacting the treated surface with an aqueous bath solution of 2.0-25.0 wt % KF at a temperature of 90° F.-212° F. for at least 5 seconds to provide a conversion coating on said surface consisting essentially of: (i) substantially all K3AlF6 or (ii) a mixture comprising a major proportion of K3AlF6 and a minor proportion of KAlF4; and (c) providing an adhesive on said conversion coated aluminum surface.
- 12. A method for providing an abrasion resistant conversion coating on a surface of an aluminum component, comprising the steps of:(a) treating said component with an alkaline cleaner to remove substantially all grease and oils from said component to form a treated surface; (b) contacting said treated surface with an aqueous bath solution of 2.0-25.0 wt % KF at a temperature of 90° F.-212° F. for 30-40 seconds to provide a conversion coating on said treated surface consisting essentially of: (i) substantially all K3AlF6 or (ii) a mixture comprising a major proportion of K3AlF6 and a minor proportion of KAlF4; (c) assembling said component into an apparatus that applies a frictional force against said conversion coating; and (d) said apparatus applying a frictional force against said conversion coating, whereby said conversion coating resists abrasion and wear.
- 13. The method of claim 12, wherein said component is a swashplate.
- 14. The method of claim 12, wherein said apparatus is a compressor.
- 15. A method for providing an abrasion resistant conversion coating on a surface of an aluminum swashplate, comprising the steps of:(a) treating said swashplate with an alkaline cleaner to remove substantially all grease and oils from said component to form a treated surface; (b) contacting said treated surface with an aqueous bath solution of 2.0-25.0 wt % KF at a temperature of 90° F.-212° F. for 30-40 seconds to provide a conversion coating on said treated surface consisting essentially of: (i) substantially all K3AlF6 or (ii) a mixture comprising a major proportion of K3AlF6 and a minor proportion of KAlF4; (c) assembling said swashplate into a compressor; (d) said compressor applying a frictional force against said conversion coating, whereby said conversion coating resists abrasion and wear.
Parent Case Info
This is a Continuation-in-part of U.S. application Ser. No. 09/347,884 filed Jul., 6, 1999. Reference is made to related U.S. application Ser. No. 09/130,014 filed Aug. 6, 1998, and entitled “Method of Simultaneous Cleaning and Fluxing of Aluminum Cylinder Block Bore Surfaces For Thermal Spray Coating Adhesion” now U.S. Pat. No. 6,187,000.
US Referenced Citations (10)
Foreign Referenced Citations (3)
Number |
Date |
Country |
1-438-955 |
Jun 1976 |
EP |
0-091-231 |
Jun 1987 |
EP |
0-140-267 |
Jul 1987 |
EP |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
09/347884 |
Jul 1999 |
US |
Child |
09/565749 |
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US |