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FORMATION AND CHARACTERIZATION OF POLYPYRROLE/(POLYANILINE-POLYPYRROLE) BI-LAYER COMPOSITE COATINGS

by UYAR, TAMER

Abstract (Summary)
A two-step electrochemical deposition process was used to form a bi-layer polypyrrole/(polyaniline-polypyrrole), PPy-(PANi/PPy), composite coating on low carbon steel. In the first step, a primer coating composed of polyaniline-polypyrrole composite coating was deposited. Subsequently, a polypyrrole topcoat was deposited onto the composite coating to form a PPy/(PANi-PPy) bi-layer coating. The chemical structure and morphology of the coatings were studied by using reflection absorption infrared spectroscopy (RAIR) and scanning electron microscopy (SEM) in order to gain a better understanding of the nature of the coatings. The DC polarization test was used to evaluate the corrosion performance of the coatings. It was found that the corrosion resistance of steel is significantly improved (more than two order of magnitude) by depositing a PPy/(PANi-PPy) bi-layer coating. This result suggests that the corrosion of steel can be prevented by using PPy/(PANi-PPy) bi-layer coating as a protective primary layer. It was also observed that the corrosion performance of these coatings is strongly dependent on the electrochemical deposition parameters such as reaction time, co-monomer feed ratio and the applied potential.
Bibliographical Information:

Advisor:

School:University of Cincinnati

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:polyaniline polypyrrole corrosion composite

ISBN:

Date of Publication:01/01/2003

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