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Studies of Electronically Conducting Polymers for Corrosion Inhibition of Aluminum and Steel

By Tallman, Dennis E.; Pae, Youngun; Chen, Guoliang; Bierwagenz, Gordon P.; Reems, Brent & Gelling, Victoria Johnston
William Andrew Publishing 1999

Abstract

Publisher Summary This chapter presents studies of electronically conducting polymers for corrosion inhibition of aluminum and steel. Preliminary results of immersion testing using electrochemical impedance spectroscopy and electrochemical noise methods on conducting polymer-coated steel and aluminum alloys are also presented. The polymers currently under study include an organic soluble polyaniline, a water-soluble polyaniline rendered insoluble through polymer–polymer complex formation, and an organic soluble alkyl-substituted polypyrrole. The metal panels used were cold-rolled steel (Bonderite 1000) and aluminum alloy (7075 T6 and 2024 T3). The organic soluble polyaniline (PANDA, Mw 70,400) was obtained from Monsanto (St. Louis, MO), contained dinonyl naphthalene sulfonic acid (DNSA) as counterion, and was dissolved in xylene. Electrochemical impedance spectroscopy (EIS) was used to investigate the electrochemical response of the Monsanto (PANDA) polyaniline-coated steel (40–50 micron coatings) as a function of immersion time in 3% NaCl. The Nyquist plot in the chapter shows two regions of distinct electrochemical response.

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