无溶剂环氧煤焦沥青涂层在模拟土壤溶液中的电化学行为  

Electrochemical behavior of solvent-free coal tar epoxy coating in simulated soil solution

作　　者：姚竟迪 梁成浩[1] 黄乃宝[1] 吴建华[2] 孙振业[1] 

机构地区：[1]大连海事大学交通运输装备与海洋工程学院,辽宁大连116026 [2]中船重工七二五研究所海洋腐蚀与防护国防科技重点实验室,福建厦门361101

出　　处：《大连海事大学学报》2015年第1期124-128,共5页Journal of Dalian Maritime University

基　　金：国家自然科学基金资助项目(21276036);中央高校基本科研业务费专项资金资助项目(3132014323)

摘　　要：采用电化学测试技术考察无溶剂环氧煤焦沥青涂层在模拟滨海氯盐土溶液中的电化学行为.结果表明,模拟滨海氯盐土溶液中,无溶剂环氧煤焦沥青的开路电位随涂层厚度的增加呈上升趋势,说明涂层厚度的增加提高了侵蚀性溶液的屏蔽阻挡能力.600μm无溶剂环氧煤焦沥青涂层在模拟滨海氯盐土溶液中浸泡30 d内,侵蚀性介质仍没有渗透到涂层-金属基体界面处,交流阻抗谱图显示单容抗弧,阻抗值为8×108Ω·cm2,表明涂层形成了高电阻、低电容的有效屏蔽层,对Q235碳钢基体起到有效的防护作用.By electrochemical techniques, the electrochemical behavior of the solvent-free epoxy coal tar coating was investi- gated in a simulated chlorine coastal saline solution. Results show that the open circuit potential of the solvent-free epoxy coal tar coating increase with coating thickness in simulated coastal saline solution, which indicate that the increase of coating thickness improved its shielding effect for preventing the corrosive solution. There is no corrosive solution in coat- ing/substrate interface after the coating with 60μm immersed in simulated chlorine coastal saline solution for 30 days. There is only one capacitive reactance arc on EIS at open cir- cuit potential and the resistance is 8×108Ω·cm2, which mean the coating has formed an effective shield with high re- sistor and low capacitor. So it can provide an effective protection for Q235 carbon steel.

关 键 词：无溶剂环氧煤焦沥青涂层 模拟土壤溶液 电化学行为 电化学阻抗谱(EIS) 

分 类 号：TQ637.2[化学工程—精细化工]