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Anti-Corrosion Properties of Polyaniline Coating

Polyaniline (PANI) coatings were electrosynthesised on steel samples (13 precentage and 5 precentage of Cr) using sulfuric and phosphoric acids as supporting electrolytes. The protective properties of the coatings in the supporting electrolytes were investigated by monitoring open-circuit potential versus time, and by applying EIS (electrochemical impedance spectroscopy). Polyaniline films have been found to provide corrosion protection. Thicker PANI films have capacitive behaviour at low frequencies with small resistance at high frequencies. Similar results were obtained on Pt. Thinner films exhibit much higher resistance probably because a significant amount of PANI is transformed from emeraldine (EM) to leucoemeraldine (LE). The protective film deposited in a phosphate solution seemed to have better properties than the film deposited in a sulfate solution and therefore this film was also tested in 0.1 molL^-1 HCl. In the chloride-containing solution, the time of protection was significantly shorter.

polyaniline coating, corrosion protection, sulfuric acid, phosphoric acid, hydrochlorid acid, stainless steel, low alloy steel, EIS

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