| Summary: | 碩士 === 元智大學 === 化學工程研究所 === 87 === The performance of the epoxy/polyamide coating on the steel surface was studied with AC impedance spectroscopy. The corrosion resistance of the steel surface was monitored by immersing the coating system in different aqueous solutions. From the Nyquist and Bode diagrams obtained from the AC impedance spectroscopy, it was shown that the resistance and the capacitance of the coating decreased and increased with the immersion time, respectively. The corrosion product was found on the steel surface after a long time exposure. The corrosion resistance of the coating system in the solutions increased in the order of 0.25 M NaCl solution < aqueous sulfuric acid solution (pH=5) < distilled water.
KEY WORD : AC impedance, epoxy, steel, coating, corrosion.
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