阴极保护电位对破损环氧涂层阴极剥离的影响

doi:10.11902/1005.4537.2018.079

中国腐蚀与防护学报

2019, Vol. 39

Issue (3): 235-244 DOI: 10.11902/1005.4537.2018.079

研究报告

本期目录 | 过刊浏览

阴极保护电位对破损环氧涂层阴极剥离的影响

王贵容^1,²,邵亚薇¹(

),王艳秋¹,孟国哲¹,刘斌¹

1. 哈尔滨工程大学材料科学与化学工程学院哈尔滨 150001
2. 航空工业成都飞机工业 (集团) 有限责任公司成都 610092

Effect of Applied Cathodic Protection Potential on Cathodic Delamination of Damaged Epoxy Coating

Guirong WANG^1,²,Yawei SHAO¹(

),Yanqiu WANG¹,Guozhe MENG¹,Bin LIU¹

1. College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
2. Aviation Industry Chengdu Aircraft Industry (Group) Co., LTD., Chengdu 610092, China

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摘要:

采用电化学阻抗技术 (EIS)，并结合SEM，EDS和XRD研究了室温、静态模拟海水中不同保护电位对海洋平台研制钢在模拟海水中防腐涂料与阴极保护联合作用效果以及对破损环氧防腐涂层的阴极剥离机理。结果表明：在本实验选择的保护电位中，随着电位的负移，涂层剥离面积逐渐增大。-750 mV (vs SCE，下同) 保护电位对于破损涂层的金属基体欠保护。-1050 mV电位极化下发生严重的析氢现象，破坏了钙质沉积层的完整性，界面碱化程度较大，涂层剥离面积最大；-850和-950 mV保护电位均能抑制破损处金属的腐蚀；-950 mV保护电位下生成的CaCO₃和Mg(OH)₂钙质沉积层完整致密，保护效果最佳。

关键词 ：环氧涂层, 阴极保护电位, 破损, 阴极剥离

Abstract：

The combined effectiveness of the cathodic protection and epoxy coating for a steel, which is newly developed for offshore platform, as well as the cathodic delamination behavior of the epoxy coating with damages in artificial seawater at room temperature were examined by means of electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM), energy dispersive spectrum (EDS) and X-ray diffractometer (XRD). Results indicated that as the potential goes down within the selected range of protection potentials of -750~-1050 mV (vs SEC), the delamination area of the coatings increases. The ordinary protection potential -750 mV (vs SEC) for epoxy coatings is no longer applicable for the damaged coatings, while the cathode potential -1050 mV leads to serious hydrogen evolution in the damaged area, resulting in the integrity destruction of the deposited film there, leading to the seriously interfacial alkalization and therewith, the cathodic delamination area increases. However, the protection potential of -850 or -950 mV can inhibit the corrosion of metal on the damaged site of coating. The deposited film formed under -950 mV on the damaged site is composed of Mg(OH)₂ and CaCO₃ which is of integrity and dense, leading to the best protective effect on the substrate.

Key words： epoxy coating cathodic protection potential damaged area cathodic delamination

收稿日期: 2018-06-03

ZTFLH:

TG174.461

基金资助:国家重点研发计划(2016YFB0300604)

通讯作者: 邵亚薇 E-mail: shaoyawei@hrbeu.edu.cn

Corresponding author: Yawei SHAO E-mail: shaoyawei@hrbeu.edu.cn

作者简介: 王贵容，女，1992年生，硕士生

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引用本文:

王贵容,邵亚薇,王艳秋,孟国哲,刘斌. 阴极保护电位对破损环氧涂层阴极剥离的影响[J]. 中国腐蚀与防护学报, 2019, 39(3): 235-244.
Guirong WANG, Yawei SHAO, Yanqiu WANG, Guozhe MENG, Bin LIU. Effect of Applied Cathodic Protection Potential on Cathodic Delamination of Damaged Epoxy Coating. Journal of Chinese Society for Corrosion and protection, 2019, 39(3): 235-244.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.079 或 https://www.jcscp.org/CN/Y2019/V39/I3/235

图1 实验装置示意图

图2 施加不同保护电位1056 h后涂层表面宏观形貌图

表1 施加不同保护电位浸泡1056 h后涂层鼓泡情况

图3 施加不同保护电位下浸泡1056 h后涂层阴极剥离情况

表2 施加不同保护电位下浸泡1056 h后涂层的剥离距离及剥离面积

图4 图3c腐蚀处的局部放大图及EDS分析结果

表3 图4a中A和B处的EDS分析结果

图5 EIS拟合所用等效电路

图6 不同保护电位下破损涂层在不同保护时间的阻抗图

图7 不同保护电位下Rt随时间的变化图

图8 不同保护电位下的Rf随时间变化图

图9 不同保护电位下沉积层物相的XRD谱

图10 不同保护电位下涂层破损处及沉积层的微观形貌照片

图11 不同保护电位下涂层破损处去除沉积层后的微观形貌图

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