The aluminium industry supplies various car body sheet qualities tailor-made to meet the requircmcnts of the car producers. The most important alloy types are AlMgSi (free from stretcher-strain markings after forming and hence suited for outer skin) and AlMg (for interior use). I n addition t o the significant weight savings it is its long service life which makes aluminium an attractive alternative to steel sheets. A prerequisite for good corrosion resistance is a surface treatment optimised for aluminium. This includes t h e creation of a phosphate surface layer t o allow lacquer coating together with steel and galvanized steel o n existing lines.The Accelerated Outdoor ExposurcTest (VDA (121-414) proved to be the only static corrosion test mcthod suitable for assessing the resistance level of thc final lacquered car body. In addition t o the proper selection of alloy and surface finishing tcchnique it is important that some aluminium-specific precautions are taken during manufacture if the full long service potential of the material is to be realized.

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