Corrosion inhibition of aluminum alloy in chloride mediums by undoped and doped forms of polyaniline |
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| Affiliation: | 1. Department of Physics, Kongu Engineering College, Perundurai, Tamil Nadu 638060, India;2. Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade 11000, Serbia;1. Department of Chemistry, National Institute of Technology Karnataka, Surathkal, Srinivasanagar, Mangalore 575025, India;2. Department of Chemistry, Atria Institute of Technology, Adjacent to Bangalore Baptist Hospital, Hebbal, Bengaluru 560 024, India;1. Department of Applied Chemistry, Indian School of Mines, Dhanbad 826004, India;2. Material Science Innovation & Modelling (MaSIM) Research Focus Area, Faculty of Agriculture, Science and Technology, North-West University (Mafikeng Campus), Private Bag X2046, Mmabatho 2735, South Africa;3. Department of Chemistry, North-West University (Mafikeng Campus), Private Bag X2046, Mmabatho 2735, South Africa;1. School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, PR China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Weihai 264209, PR China;3. Weihai Institute of Marine Biomedical Industrial Technology, Wendeng District, Weihai 264400, PR China |
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| Abstract: | Corrosion inhibition of Al 3003 alloy by pure undoped PANI (emeraldine base) and PANI doped with p-toluene-sulfonic, camphorsulfonic and dodecylbenzenesulfonic acids was investigated. Corrosion resisting properties of PANI coatings with an artificially created hole defect were evaluated by electrochemical impedance spectroscopy (EIS) in aqueous 3.5% NaCl and 0.1 N HCl solutions. The highest corrosion inhibition factor was obtained for undoped PANI being equal to 12 and 4.4 in neutral and acidic media, respectively. The results indicated that corrosion protection of the bare aluminum alloy surface resulting from a defect of the PANI coating is in line with an increase of the thickness of the oxide layer protecting the aluminum alloy surface. The efficiency of corrosion protection of mild steel and aluminum alloy by polyaniline coatings was compared. |
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