Patent ID: 6475301
Filing Date: 2002-11-05
Classification: B23K,C23C

Abstract:
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 90Â° F.-212Â° 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.