Failure Analysis Of Conductive Paint Coating Using Electrochemistry Method

Najla Shazwani , Din (2009) Failure Analysis Of Conductive Paint Coating Using Electrochemistry Method. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This report covers the failure analysis of conductive paint coating by using electrochemistry method. The paint coating used in this analysis is the combination of epoxy resin and carbon black and also polyamide as a hardener. The formulation of pure epoxy paint coating is modified by adding carbon black filler of 5%, 10%, 15% and 20% of its weight. This conductive paint coating is then molded by using plastic pipe to form a pellet. Corrosion test by using Tafel Extrapolation method is conducted in order to determine the corrosion rate of the sample. The analysis methods used in this project research are Scanning Electron Microscopy (SEM) for microstructures observation, Energy Dispersive x-ray Spectroscopy (EDS) for elemental composition and Fourier Transform Infrared spectroscopy (FTIR) which is to characterize the chemical bonding are conducted before and after the corrosion test. Moreover, pH test also conducted to investigate the corrosion behavior in different corrosive environment. As a result, the modified conductive paint coating with 20%CB is noted as a severe corrosion failure compared to the other samples while the pure epoxy paint coating is the one that behave as a good corrosion resistance. It can be proved that the corrosion rate for the modified conductive paint coating with 20%CB is found to be the highest due to the particle size of the carbon black used which is not in powder form. This condition also occurred to another corrosive environment which is in acidic and alkali environment. Furthermore, the surface morphology of degraded samples showed that corrosion failure in form of weak spots and blisters for the 20%CB sample. The epoxy paint coating is suggested to combine with the polyaniline emeraldine salt (PAni-ES) replacing the carbon black filler in order to obtain excellent corrosion resistance of this coating.

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