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Abstract
Polyaniline, polypyrrole, poly(N-ethyl aniline), poly(O-anisidine) and their composite coatings were electrodeposited on Al-2024 alloy. The electrodeposited films were characterised using IR spectroscopy. The peel test (ASTM 3359-97), the lap joint test (ASTM D1002) and electrochemical impedance spectroscopy were used to evaluate the adhesion of these coatings and the delamination area under the coating. It was found that the adhesion of these coatings depends on the electrodeposition parameters and the structure of the polymer film. There was no significant delamination of the coating after immersion in Harrison solution for 55 days. Contact angle analysis was conducted to evaluate the hydrophobicity of the film. Salt immersion and dc polarisation studies were used to evaluate the durability and the corrosion protection offered by the coatings, respectively.