深海压力交变加速条件下改性石墨烯有机涂层的失效机制

doi:10.11902/1005.4537.2019.224

中国腐蚀与防护学报

2020, Vol. 40

Issue (2): 139-145 DOI: 10.11902/1005.4537.2019.224

研究报告

本期目录 | 过刊浏览

深海压力交变加速条件下改性石墨烯有机涂层的失效机制

曹京宜¹, 王智峤¹, 李亮¹, 孟凡帝²(

), 刘莉², 王福会²

1 中国人民解放军92228部队北京 100072
2 沈阳材料科学国家研究中心东北大学联合研究分部沈阳 110819

Failure Mechanism of Organic Coating with Modified Graphene Under Simulated Deep-sea Alternating Hydrostatic Pressure

CAO Jingyi¹, WANG Zhiqiao¹, LI Liang¹, MENG Fandi²(

), LIU Li², WANG Fuhui²

1 Unit 92228, People's Liberation Army, Beijing 100072, China
2 Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

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摘要:

采用可控的化学氧化法制备出功能化石墨烯，最终实现石墨烯与三乙烯四胺的接枝反应。结果表明：石墨烯经化学修饰后其片层结构更平滑舒展。添加改性石墨烯的涂层在致密性、附着力等方面的性能明显提高。化学改性通过提高石墨烯的分散性及其与环氧树脂基料的相容性，减少涂层的内部缺陷，涂层结构更加致密，有效阻挡了腐蚀介质的扩散。同时，与环氧树脂形成紧密结合的化学结合界面，延缓了交变压力对该界面的破坏作用，从而延长涂层在交变压力条件下的使役寿命。

关键词 ：改性石墨烯, 有机涂层, 压力交变, 失效机制

Abstract：

Functionalized graphene was firstly prepared by controllable chemical oxidation method, thus grafting reaction between graphene and triethylenetetramine could be realized. The results showed that the structure of graphene sheet is smoother after chemical modification. The properties such as compactness and adhesion of the epoxy resin coating were obviously improved due to the proper incorporation of the modified graphene. Chemical modification can also improve the graphene's dispersibility in and compatibility with epoxy resin binder, as a result, internal defects of the coating can be reduced, which makes the coating much compact and thus effectively prevents the inward migration of corrosive medium. In addition, chemically-bonded interfaces between the modified graphene and epoxy resin can be formed, which delays the destruction of the interface by alternating hydrostatic pressure, and thus prolongs the service life of the coating under this condition.

Key words： modified graphene organic coating alternating hydrostatic pressure failure mechanism

收稿日期: 2019-05-08

ZTFLH:

TG174

通讯作者: 孟凡帝 E-mail: fandimeng@mail.neu.edu.cn

Corresponding author: MENG Fandi E-mail: fandimeng@mail.neu.edu.cn

作者简介: 曹京宜，女，1972年生，研究员

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引用本文:

曹京宜, 王智峤, 李亮, 孟凡帝, 刘莉, 王福会. 深海压力交变加速条件下改性石墨烯有机涂层的失效机制[J]. 中国腐蚀与防护学报, 2020, 40(2): 139-145.
Jingyi CAO, Zhiqiao WANG, Liang LI, Fandi MENG, Li LIU, Fuhui WANG. Failure Mechanism of Organic Coating with Modified Graphene Under Simulated Deep-sea Alternating Hydrostatic Pressure. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 139-145.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.224 或 https://www.jcscp.org/CN/Y2020/V40/I2/139

图1 功能化后石墨烯的红外光谱图

图2 不同时间条件下改性和未改性石墨烯粉末在有机溶剂中的分散稳定性

图3 改性及未改性石墨烯粉末的SEM像

图4 交变压力条件下未改性石墨烯和改性石墨烯涂层的吸水动力学曲线

图5 不同压力条件下石墨烯有机涂层的湿态附着力随浸泡时间的变化

图7 改性石墨烯有机涂层在交变压力下浸泡不同时间的Nyquist图

图6 未改性石墨烯有机涂层在交变压力下浸泡不同时间的Nyquist图

图8 两种有机涂层的涂层电阻Rc随浸泡时间的变化

图9 交变压力下两种涂层失效过程示意图

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