环氧粉末涂层在1.5 mol/L NaCl溶液中的失效行为

doi:10.11902/1005.4537.2013.132

中国腐蚀与防护学报

2014, Vol. 34

Issue (4): 382-388 DOI: 10.11902/1005.4537.2013.132

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环氧粉末涂层在1.5 mol/L NaCl溶液中的失效行为

杨海, 陆卫中, 李京, 孙超

中国科学院金属研究所金属腐蚀与防护国家重点实验室沈阳 110016

Degradation Behavior of Fusion Bonded Epoxy Powder Coating on Q235 Carbon Steel in 1.5 mol/L NaCl Solution

YANG Hai, LU Weizhong, LI Jing, SUN Chao

State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

全文: PDF(4225 KB)

摘要: 通过电化学阻抗谱 (EIS) 对两种环氧粉末涂层在1.5 mol/L NaCl溶液中的失效行为进行了研究,利用扫描电子显微镜 (SEM) 和能谱仪 (EDS) 对涂层底部金属表面的腐蚀产物进行了分析,探讨了环氧粉末涂层在1.5 mol/L NaCl溶液中的失效机理。结果表明,在1.5 mol/L NaCl溶液中,Cl^-等腐蚀介质能在涂层中形成传输通道渗透到涂层与金属界面,并参与界面的腐蚀反应,腐蚀产物主要为Fe的氧化物和氯化物。

关键词 ：环氧粉末涂层, NaCl溶液, 失效

Abstract：The degradation behavior of two kind of fusion bonded epoxy coatings on Q235 carbon steel in 1.5 mol/L NaCl solution was investigated by electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM) with energy dispersive spectrometer (EDS). The results showed that corrosive species (Cl^- etc) could penetrate through the coating and then arrive at the interface of coating/Q235 carbon steel ,which then induced corrosion reaction there, resulting corrosion products composed mainly of iron oxide and iron chloride. Finally a three step process was proposed to describe the electrochemical process of the coating degradation.

Key words： epoxy powder coating NaCl solution degradation behavior

收稿日期: 2013-08-14

ZTFLH:

TG174.5

基金资助:中国科学院知识创新工程项目 (KGCX2-YW-219) 资助

通讯作者: 通讯作者：陆卫中,E-mail：wzlu@imr.ac.cn E-mail: wzlu@imr.ac.cn

作者简介: 杨海，男，1986年生，硕士生，研究方向为有机涂层失效

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杨海, 陆卫中, 李京, 孙超. 环氧粉末涂层在1.5 mol/L NaCl溶液中的失效行为[J]. 中国腐蚀与防护学报, 2014, 34(4): 382-388.
YANG Hai, LU Weizhong, LI Jing, SUN Chao. Degradation Behavior of Fusion Bonded Epoxy Powder Coating on Q235 Carbon Steel in 1.5 mol/L NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2014, 34(4): 382-388.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.132 或 https://www.jcscp.org/CN/Y2014/V34/I4/382

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