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| Study on Preparation and Corrosion Resistance of Conductive Polyaniline Coating on Aluminum by Electropolymerization |
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| 湖南科技大学南校区化学化工学院；中南大学化学化工学院 |
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Abstract Polyaniline （PANI） films are deposited on aluminum substrate through electrochemical process and the corrosion resistance of PANI films is studied. The results show metallic nickel of nonelectrolytic deposition on the aluminum surface can catalyze electropolymerization of aniline.The proper upper scanning potential through cyclic voltammetry is not more than 0.7 V（vs. Hg/Hg2SO4）； the polymerization potential range through potentio?鄄static is between 0 and 0.45 V（vs. Hg/Hg2SO4）； the current density through galvanostatic is not more than 0.3 mA/cm2；the proper electrolytic pH value is at range of 2 to 3.The potentiodynamic polarization curves in 0.5 mol/L sodium chloride solution show that the pitting corrosion potentials of aluminum electrodes coated with PANI through cyclic voltammetry，potentiostatic or galvanostatic method shift toward positive direction as compared with pure aluminum electrode.The PANI coating could improve the pitting corrosion resistance of aluminum and its alloy.
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Received: 18 July 2006
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