Abstract
Cathodic disbonding of chlorinated rubber coatings from steel has been examined under free corrosion conditions. Two coatings, a clear lacquer and a primer containing iron oxide pigment, on steel panels were exposed to 0.5 M NH 4Cl, LiCl, KCI, CsCl or SrCl 2 solutions. In some tests a double-cell was used in which the defect and the surrounding coated areas could be exposed to different solutions. There were pronounced differences between the pigmented and unpigmented coatings. With alkali metal chlorides the rate of disbonding of unpigmented lacquer showed a strong dependence on cation mobility, but with the pigmented coating it did not. It is proposed that the controlling process changes from ion transport along the interface to oxygen diffusion. Without cathodic polarisation the disbonding eventually ceases.
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