表面技术Issue(3)：95-99,5.DOI:10.16490/j.cnki.issn.1001-3660.2015.03.016
无溶剂环氧煤焦沥青涂层在土壤中的电化学行为
Electrochemical Behavior of Solvent-free Coal Tar Epoxy Coating in Soil
摘要
Abstract
ABSTRACT:Objective The electrochemical behavior of the solvent-free epoxy coal tar coating was investigated in the soil solution of saturated water content. Methods The solvent-free epoxy coal tar coating was applied on Q235 steel, the open circuit potential and electrochemical impedance spectroscopy of the coatings at different thicknesses and different buried time were tested, and the effects of coating thickness and buried time on the electrochemical behavior of the coating were explored. SEM analysis of the ele-mental composition of corrosion products on the substrate surface were used to explore whether the aggressive substances reached the substrate surface and was involved in the corrosion. Results The stable open circuit potential of Q235 steel with a coating thick-ness of 200μm was about-0. 37 V, and the corrosion potential shifted positively by about 0. 28 V as compared to that of the Q235 bare steel. With the increase of coating thickness, the open circuit potential showed a rising tendency, the capacitance arc radius <br> increased, and the shielded blocking ability of the coating in aggressive solutions was improved. The protective performance of the coating declined, the capacitance arc radius reduced and water absorption increased with the prolonging buried time in soil, but the low-frequency impedance modulus value still reached up to 8. 8×107 Ω·cm2. The energy spectrum analysis showed that no corro-sive substances such as Cl-appeared on the surface of Q235 steel. Conclusion The solvent-free coal tar epoxy coating in soil solu-tion could effectively form a shielding layer and provided an effective protection for Q235 carbon steel.关键词
无溶剂环氧煤焦沥青涂层/土壤/Q235碳钢/电化学行为/电化学阻抗谱/开路电位Key words
solvent-free epoxy coal tar coating/soil/Q235 carbon steel/electrochemical behavior/electrochemical impedance spectroscopy( EIS)/open circuit potential分类
矿业与冶金引用本文复制引用
孙振业,梁成浩,黄乃宝..无溶剂环氧煤焦沥青涂层在土壤中的电化学行为[J].表面技术,2015,(3):95-99,5.基金项目
国家自然科学基金(21276036) （21276036）
中央高校基本科研业务费专项资金(3132014323) @@@@Supported by the National Natural Science Foundation of China (21276036) and the Fundamental Research Funds for the Central Universities (3132014323) （3132014323）
