Comparison of corrosion protection between double strands of polyaniline and poly-o-anisidine with poly(Acrylic Acid-Co-Acryl Amide) on steel

• Main Authors: Mahmoudian, M.R., Alias, Y., Basirun, Wan Jefrey
• Format: Article
• Published: Springer Verlag 2012
• Subjects: QD Chemistry
• Online Access: http://eprints.um.edu.my/7527/; http://download.springer.com/static/pdf/532/art%253A10.1007%252Fs11998-011-9345-y.pdf?auth66=1360913927_e451981725b5aa8dc71f609fab36d16e&ext=.pdf
• Institution: Universiti Malaya

Double strands of polyaniline (PAn) and poly(o-anisidine) (POAn) with poly(acrylic acid-co-acryl amide) (PAA-co-AA) were successfully prepared on steel as undercoating, by immersion of the pretreated surfaces into a PAn: (PAA-co-AA) and POAn: (PAA-co-AA) saturated DMF solution separately. The undercoatings formed on the steel were characterized by Fourier transform infrared spectroscopy (FTIR) techniques. A commercial paint (Nippon Paint, nonadded Chrome) was used as topcoating. Electrode/electroactive polymer/paint/electrolyte system was studied by electrochemical impedance spectroscopy (EIS). The EIS studies show that during the first 18 days immersion time in 3.5% solution of NaCl, paint/PAn coating has better corrosion resistance than paint/POAn coating while in the final week of immersion time, the pore resistance (R-po) and coating capacitance (C-c) of paint/POAn are higher and lower than the paint/PAn, respectively.