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11043 The Effect of Substrate Topography on Cathodic Delamination

Picture for 11043 The Effect of Substrate Topography on Cathodic Delamination
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Product Number: 51300-11043-SG
ISBN: 2011 11043 CP
Author: Claus E. Weinell, Per A. Soerensen, Soeren Kiil
Publication Date: 2011
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The effect of steel substrate topography on cathodic delamination has been investigated in this study. Different surface preparation methods have been used to prepare different surface contours. The rate of delamination was found to be reduced by a greater tortuosity of the coating-steel interface. Furthermore it was found that the tortuosity of the coating-steel interface can be controlled by e.g. the grain size of the blasting material and the impact velocity of the applied abrasive. In other words the study showed that the surface preparation can be used to control and minimize the rate of cathodic delamination. However, the peak density should not be too high because the valleys may become too narrow for complete wetting. This may be particularly important for pigmented coatings because pigment particles may get trapped in the valley and prevent complete wetting of the substrate. In other words, the coating’s physical properties should be optimized with maximum wetting properties so that substrates with high tortuosity can be utilised.

Key words: Cathodic delamination, substrate topography, tortuosity.
The effect of steel substrate topography on cathodic delamination has been investigated in this study. Different surface preparation methods have been used to prepare different surface contours. The rate of delamination was found to be reduced by a greater tortuosity of the coating-steel interface. Furthermore it was found that the tortuosity of the coating-steel interface can be controlled by e.g. the grain size of the blasting material and the impact velocity of the applied abrasive. In other words the study showed that the surface preparation can be used to control and minimize the rate of cathodic delamination. However, the peak density should not be too high because the valleys may become too narrow for complete wetting. This may be particularly important for pigmented coatings because pigment particles may get trapped in the valley and prevent complete wetting of the substrate. In other words, the coating’s physical properties should be optimized with maximum wetting properties so that substrates with high tortuosity can be utilised.

Key words: Cathodic delamination, substrate topography, tortuosity.
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