Patent ID: 7645488

Claim:
Method for production of weather- and corrosion-resistant formed metal parts of aluminum or an aluminum alloy with decorative surface using a coil coating process, comprising the steps of: (a) providing a strip of aluminium or an aluminium alloy, (b) optionally continuous degreasing of the strip, (c) optionally electrochemical, chemical or mechanical polishing of the degreased strip, (d) continuous pre-treatment of the optionally degreased and/or polished strip to produce a pre-treatment coating which is suitable as an adhesion base for a lacquer coating, (e) continuous lacquering of the pretreated strip with a sol-gel lacquer of polysiloxane to generate a first protective coating (f) continuous drying and hardening of the first protective coating in a belt oven, (g) forming metal parts from the strip by (1) shaping the strip with the first protective coating and trimming, or (2) cutting metal parts out of the strip with the first protective coating and shaping of the cut metal parts, (h) lacquering the formed metal parts with a further sol-gel lacquer of a polysiloxane to generate a second protective coating, and (i) drying and hardening of the second protective coating in an oven.