초록 ▼

An aluminum or aluminum alloy surface which during use is exposed to sliding friction has a chemical conversion coating of mostly tin with 0.2-10.0 wt. % cobalt and 0.1 to 12 wt. % bismuth. For example, a swashplate of a swashplate type compressor may be conversion coated on at least part thereof, t

An aluminum or aluminum alloy surface which during use is exposed to sliding friction has a chemical conversion coating of mostly tin with 0.2-10.0 wt. % cobalt and 0.1 to 12 wt. % bismuth. For example, a swashplate of a swashplate type compressor may be conversion coated on at least part thereof, that is the part that during use contact the shoes. Preferably, the coating is between 0.8 to 2.5 microns thick. The coating on the swash plate permits the use of low silicon alloy aluminum without the need of metal plating or high finish polishing.

대표청구항 ▼

[ I claim:] [1.] An article having an aluminum or aluminum alloy surface which, during use of the article, is exposed to sliding friction and which carries, on at least a part thereof, a chemical conversion coating of tin with 0.2 to 10.0 wt. % cobalt and 0.1 to 12 wt. % bismuth, the coating being f

[ I claim:] [1.] An article having an aluminum or aluminum alloy surface which, during use of the article, is exposed to sliding friction and which carries, on at least a part thereof, a chemical conversion coating of tin with 0.2 to 10.0 wt. % cobalt and 0.1 to 12 wt. % bismuth, the coating being formed by contact with an aqueous alkaline conversion coating bath, the bath containing soluble tin, bismuth and cobalt compounds in amounts sufficient to provide said conversion coating on said aluminum surface.