環氧樹脂/鋼材介面交流阻抗探討

The behavior of Epoxy/Steel interface investigated by AC impedance

范郁惠(Yu-Hui Fan)

指導教授 ： 洪信國

元智大學/工程學院/化學工程與材料科學學系/碩士(1998年)

摘要

本研究在探討混凝土中鋼筋之塗膜防蝕效果。以環氧樹脂/聚醯胺做為防護系統塗覆於鋼筋表面，利用電化學中的交流阻抗法（AC impedance），測試在各種模擬的腐蝕環境下，塗層所遭受的破壞與劣化情形。實驗結果由Nyquist圖（Z′vs. Z〞）與Bode圖（︳Z ︳vs. logf與phase angle vs. logf）的圖形分析得知，在很薄之金屬/塗膜系統下，將試片浸漬於0.25M氯化鈉、pH=5硫酸溶液、蒸餾水三種腐蝕環境中，塗層吸水，快速到達飽和，塗層阻抗值於短時間內迅速降低，塗層受破壞的速度為0.25M氯化鈉＞pH=5硫酸溶液＞蒸餾水。
關鍵字;交流阻抗、環氧樹脂、鋼筋、塗料、腐蝕

關鍵字

交流阻抗 ； 環氧樹脂 ； 鋼筋 ； 塗料 ； 腐蝕

並列摘要

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.

並列關鍵字

AC impedance ； epoxy ； steel ； coating ； corrosion

參考文獻

1. E. Mattsson, Basic Corrosion Technology for Scientists and Engineers, Ellis Horwood, Chichester, UK, 13 (1989)

2. G. Wranglen, An intrduction to Corrosion and Protection of Metals, Chapman and Hall, London, pp.xv.1995

6. J. R. Macdonald, Journal of Chemical Physics, 23, 275 (1995)

18. B. Fastrup and A. Saaranak, Prog. Org. Coat., 16, 277(1988)

20. J. R. Saully, J. Electrochem. Soc., 136, 979(1989)