ABSTRACT
Pitting corrosion away from the scribe lines was observed with both controls, i.e., E-coat on CC and Deft-chromated primer on CC, reflecting the weaker adhesion compared to plasma interface-engineered samples. The more pitting corrosions were found with the spray primer, which turned out to be the best performer (the smallest corrosion width) in a Prohesion salt spray test. In this case, the corrosion inhibitor is indeed working but cannot stop pitting corrosions under the undamaged coating.
