BRIGHT COATINGS FOR ALUMINIUM OR STEEL MOTOR VEHICLE WHEELS AND THEIR PRODUCTION

摘要

#CMT# #/CMT# Shiny coatings for car wheels made from light metal alloys or steel comprises at least one layer of aluminum or aluminum alloy. This is applied directly to the surface of the wheel. #CMT# : #/CMT# Independent claims are included for: (A) a method for producing shiny coatings on aluminum alloy or steel surfaces comprising:(1) gas phase deposition of aluminum or aluminum alloy to from a sealed, shiny coating; and (b) electrochemical oxidation of the coating to produce a nano- to microporous second layer of aluminum oxide with a thickness of 50 - 1000 nm; and (B) car wheels made from aluminum alloys or steel with a shiny coating as described. #CMT#USE : #/CMT# Shiny coatings for car wheels made from light metal alloys or steel. #CMT#ADVANTAGE : #/CMT# Surfaces which cannot easily be anodized to produce a shine can be coated and soiling of the coated wheels is reduced. #CMT#METALLURGY : #/CMT# Preferred features: The aluminum or aluminum alloy coating is produced by a CVD or PVD process. A second nano- to microporous oxide layer is applied over it. This has a thickness of 50 - 1000 nm. A third layer of clear lacquer or easy-to-clean lacquer is applied over the second layer. The wheel is made from an Al alloy containing 3 - 12wt% of Si. The CVD process is a cold gas process in which aluminum surfaces have a temperature of 280 - 350[deg] C and steel surfaces a temperature of 280 - 580[deg] C. #CMT#POLYMERS : #/CMT# Preferred materials: The third layer comprises a silane, silazane and/or silicone polymer. It preferably contains perhydrosilazane polymers, hydrophilic copolymers and/or additives and titanium oxide.