交变压力对无溶剂环氧涂层在模拟超深海环境下的电化学行为

doi:10.11902/1005.4537.2022.133

中国腐蚀与防护学报

2022, Vol. 42

Issue (6): 929-938 DOI: 10.11902/1005.4537.2022.133

研究报告

本期目录 | 过刊浏览

交变压力对无溶剂环氧涂层在模拟超深海环境下的电化学行为

王腾宇¹^,², 张正贵¹, 陆卫中²(

), 吴希革³

1.沈阳大学机械工程学院沈阳 110018
2.中国科学院宁波材料技术与工程研究所宁波 315200
3.大庆庆鲁朗润科技有限公司大庆 163316

Effect of Alternating Pressure on Electrochemical Behavior of Solvent-free Epoxy Coating in Simulated Ultra-deep Sea Environment

WANG Tengyu¹^,², ZHANG Zhenggui¹, LU Weizhong²(

), WU Xige³

1. School of Mechanical Engineering, Shenyang University, Shenyang 110018, China
2. Ningbo Institute of materials technology and engineering, Chinese Academy of Sciences, Ningbo 315200, China
3. DaQing Qinglu Langrun Technology Co. Ltd., Daqing 163316, China

引用本文:

王腾宇, 张正贵, 陆卫中, 吴希革. 交变压力对无溶剂环氧涂层在模拟超深海环境下的电化学行为[J]. 中国腐蚀与防护学报, 2022, 42(6): 929-938.
Tengyu WANG, Zhenggui ZHANG, Weizhong LU, Xige WU. Effect of Alternating Pressure on Electrochemical Behavior of Solvent-free Epoxy Coating in Simulated Ultra-deep Sea Environment[J]. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 929-938.

全文: PDF(7725 KB) HTML

摘要:

通过EIS和LEIS对环氧粉末涂层和无溶剂环氧液体涂层分别在模拟超深海环境中0.1~20和0.1~30 MPa交变压力腐蚀环境下浸泡480 h的失效行为进行了研究,分析了超深海交变压力对涂层耐腐蚀性能的影响,并利用SEM观察了浸泡后涂层/Q345钢界面的表面形貌。研究表明,两种涂层在0.1~30 MPa交变压力作用下涂层的失效过程较为明显,环氧粉末涂层在0.1~30和0.1~20 MPa交变压力浸泡480 h后涂层阻抗值分别下降了2个和1个数量级,无溶剂环氧液体涂层在同样环境下浸泡后阻抗值分别下降了3个和2个数量级,说明了环氧粉末涂层在交变压力条件下对Q345的保护性能更优,阻绝离子渗透能力更强。从LEIS结果分析出在较高交变压力下,涂层微观局部腐蚀扩散速率更快。

关键词 ：交变压力, 无溶剂环氧涂层, 超深海, 电化学行为, 失效

Abstract：

The failure behavior of epoxy powder coating and solvent-free epoxy liquid coating in simulated ultra-deep-sea environment for 480 h was studied by means of EIS and LEIS, while by applied alternating pressures within ranges 0.1-20 and 0.1-30 MPa respectively. The effect of alternating pressure on the corrosion resistance of coatings in deep-sea was examined, and the surface morphology of the coating/Q345 steel interface after immersion was characterized by SEM. The results show that the failure process of the two coatings is obvious under the alternating pressure of 0.1-30 MPa. After 480 h of pressured immersion, the impedance value of the epoxy powder coating decreased by 2 and 1 orders of magnitude after 480 h immersion at 0.1-30 and 0.1-20 MPa alternating pressures, respectively, and the impedance value of the solvent-free epoxy liquid coating decreased by 3 and 2 orders of magnitude respectively after immersion in the same environment. It shows that the epoxy powder coating has better protection performance to the Q345 steel in the condition of alternating pressure, and the ability to block ion penetration is stronger. According to the LEIS results, the failure behavior of the coating gradually spreads from local sites to the whole area under the alternating pressure, and the greater the alternating pressure, the faster the spread rate of the localized damage of the coating.

Key words： alternating pressure solvent-free epoxy coating ultra-deep sea electrochemical behavior failure behavior

收稿日期: 2022-05-05

ZTFLH:

TG174.5

基金资助:宁波市“十三五”海洋经济创新发展示范项目(NBHY-2019-Z7)

作者简介: 王腾宇,男,1996年生,硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2022.133 或 https://www.jcscp.org/CN/Y2022/V42/I6/929

图1 涂层A在0.1~30 MPa交变压力下浸泡480 h后的EIS测试结果

表1 涂层A在0.1~30 MPa交变压力下浸泡480 h期间EIS参数拟合结果

图2 涂层B在0.1~30 MPa交变压力下浸泡480 h后的EIS测试结果

表2 涂层B在0.1~30 MPa交变压力下浸泡480 h期间EIS参数拟合结果

图3 涂层A在0.1~20 MPa交变压力下浸泡480 h后的EIS测试结果

图4 涂层B在0.1~20 MPa交变压力下浸泡480 h后的EIS测试结果

图5 涂层A和涂层B在交变压力下浸泡480 h后涂层电阻 (Rc) 的变化曲线

图6 涂层A和涂层B在交变压力下浸泡480 h后涂层电容 (Qc) 的变化曲线

图7 两种涂层在交变压力作用下浸泡480 h后的LEIS结果图

表3 两种涂层在不同交变压力浸泡480 h后的LEIS数据对比

表4 涂层A和涂层B分别在不同交变压力下浸泡480 h后的Q345基体表面元素分析

图8 两种涂层在交变压力浸泡480 h后的表面SEM像

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