Electroactive Polymer for Corrosion Inhibition of Aluminum Alloys

摘要

A template-guided synthetic method was used to synthesize inter-polymer complexes of polyaniline. The complexes of polyaniline and the polymeric dopant are advantageous comparing to the single-strand polyaniline. The "double-strand" polyaniline are more stable in the conductive state and they are easier to be processed as additives to paints. A water-borne double-strand polyaniline was used as additive to commercial water-borne epoxy primers. The electroactive, water-borne primer was coated on aluminum alloys by electrophoretic coating process. Uniform coatings (0.8 mil thickness) on AA7075, AA2024 and AA6061 alloys were obtained and were used for salt-spray, seawater immersion and filiform corrosion tests. The corrosion test results show that the conducting polymers are effective in inhibiting corrosion with small amount of conducting polymer as additive to the epoxy primers. Comparing with the small ion doped single strand polyaniline, the double-strand polyaniline used in this study has the advantage of the ease in integration in epoxy resin, and the resistence to dedoping in pH 8 seawater.