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Evidence of a Passive Layer Formation from a Conductive Polymer Coating on Aluminum Alloys

Published online by Cambridge University Press:  10 February 2011

R. J. Racicot ,
S. C. Yang  and
R. Brown
R. J. Racicot
Affiliation:
Department of Chemistry, University of Rhode Island, Kingston RI 02881
S. C. Yang
Affiliation:
Department of Chemistry, University of Rhode Island, Kingston RI 02881
R. Brown
Affiliation:
Department of Chemical Engineering, University of Rhode Island, Kingston RI 02881
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Abstract

Evidence for the formation of a passive layer between a conductive polymer coating and aluminum alloy surfaces is reported Experimental results from electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) on aluminum alloys coated with a novel double strand conductive polymer coating based on polyaniline reveal the evidence for the formation of passive layer. The key results are: (1) Modeling of EIS data is best fit with a three RC circuit, indicating a third interface between the polymer coating and the alloy's surface; (2) EIS testing in acidic salt solutions shows the conductive polymer coating performs differently and better than a typical anodized or chromáte conversion coating indicating a possibly different interface layer than a typical aluminum oxide and (3) SEM studies of the aluminum surface, after the polymer film is removed, indicates that this interfacial layer has a dense and smooth “oxide type” surface morphology. The experimental results are consistent with a mechanism in which the conducting polymer serves as a surface conversion agent that oxidizes the aluminum metal surface to form a passive layer.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 458: Symposium W – Interfacial Engineering for Optimized Properties , 1996 , 415
Copyright
Copyright © Materials Research Society 1997

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