Cathodic Disbonding at High Temperature

A new method for accelerated testing of cathodic disbonding at high temperature, simulating field conditions for coatings on submerged high temperature surfaces, was presented at CORROSION/2010. The method has now been further developed and a test program studying the effect of various test parameters have been performed, focusing on temperature, oxygen partial pressure, potential and hydrostatic pressure. The results are compared to a non-accelerated long term cathodic disbonding test in seawater and the ISO 15711 laboratory test. Other coating degradation mechanisms like adhesion loss general thermal degradation of the coatings were also investigated.