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Process of forming enhanced heat transfer surfaces

  • US 4,767,497 A
  • Filed: 04/01/1987
  • Issued: 08/30/1988
  • Est. Priority Date: 04/01/1987
  • Status: Expired due to Fees
First Claim
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1. A process for enhancing the heat transfer properties of the surface of an aluminum alloy containing a pre-existing precipitate comprising subjecting said aluminum alloy to an etching composition for said precipitate for an effective period of time such that pits having an average size of from about 0.5 to 5 microns are formed in the surface, wherein prior to etching, the alloy is heating to a temperature sufficient to dissolve precipitates which, when subjected to said etching composition would form pits smaller than about 0.5 micron and quenched so that said precipitates do not reform, thereby minimizing the formation of pits smaller than about 0.5 micron.

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