The delamination of polymeric coatings (pc) on iron and steel is a phenomena everybody knows e.g. from his rusting car. The damage caused by it costs the Western countries hundreds of millions Euro every year. Hence it is a very important task for the steel industry and also for scientists to improve the stability of the pc on iron and steel. The authors developed a new corrosion protection of iron by covering it with a thin layer of a-SiO : Fe. An adhesion promoter sticks on top of it so that the pc adhers well. The delamination of the pc as function of the surface preparation (roughness. adhesion promoter) is described in this paper. The Scanning Kelvin Prove (SKP) is utilized to detect the delamination.
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