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Anti-Corrosion Studies of Novel Conductive Polymer Coatings on Aluminum Alloys

Published online by Cambridge University Press:  10 February 2011

R. J. Racicot ,
R. L. Clark ,
H-B Liu ,
S. C. Yang ,
M. N. Alias  and
R. Brown
R. J. Racicot
Affiliation:
Department of Chemistry, University of Rhode Island, Kingston, RI 02882.
R. L. Clark
Affiliation:
Department of Chemistry, University of Rhode Island, Kingston, RI 02882.
H-B Liu
Affiliation:
Department of Chemistry, University of Rhode Island, Kingston, RI 02882.
S. C. Yang
Affiliation:
Department of Chemistry, University of Rhode Island, Kingston, RI 02882.
M. N. Alias
Affiliation:
Department of Chemical Engineering, University of Rhode Island, Kingston, RI 02882.
R. Brown
Affiliation:
Department of Chemical Engineering, University of Rhode Island, Kingston, RI 02882.
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Abstract

We report the corrosion protection properties of a novel conductive polymer coating on aluminum alloys. The conductive polymer coating is a double strand molecular complex of polyaniline and a polyelectrolyte. The double strand polyaniline offers advantages in stability and processability over other forms of conductive polymers. The coated aluminum alloys (AA7075- T6) were evaluated for corrosion protection in an aggressive salt environment of.5N NaCl solutions using cyclic polarization and electrochemical impedance spectroscopy. Corrosion current densities were calculated for uncoated alloy samples and alloys coated with the conductive and non-conductive derivative of the double strand polymer. The conductive form of the double strand polyaniline coating shows a two order of magnitude lowering of the corrosion current over the uncoated samples and a one order magnitude lowering over the non-conductive form of the polymer coated samples. The shape of the cyclic polarization data closely resembles results of sulfuric acid anodized aluminum. This data indicates that the conductive state of the polymer is required for improved corrosion protection and an anodized type protection is occurring.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 413: Symposium W – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials III , 1995 , 529
Copyright
Copyright © Materials Research Society 1996

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References

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