景超杰,方博,赵方超,赵阳,杨小奎,陈雪晴,周堃,刘杰.深海静水压力对环氧涂层/907A低合金钢体系失效行为的影响[J].表面技术,2024,53(16):68-77, 102.
JING Chaojie,FANG Bo,ZHAO Fangchao,ZHAO Yang,YANG Xiaokui,CHEN Xueqing,ZHOU Kun,LIU Jie.Effect of Deep-sea Hydrostatic Pressure on Failure Behavior of Epoxy Coating/907A Low Alloy Steel System[J].Surface Technology,2024,53(16):68-77, 102 |
| 深海静水压力对环氧涂层/907A低合金钢体系失效行为的影响 |
| Effect of Deep-sea Hydrostatic Pressure on Failure Behavior of Epoxy Coating/907A Low Alloy Steel System |
| 投稿时间：2023-09-12 修订日期：2023-11-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.16.005 |
| 中文关键词: 环氧涂层 深海静水压力 水传输行为 失效行为 电化学阻抗谱 |
| 英文关键词:epoxy coating deep-sea hydrostatic pressure water transport behavior failure behavior electrochemical impedance spectroscopy |
| 基金项目:重庆市技术创新与应用发展专项重点项目(KJJ202105);国家自然科学基金(51971192);山东省泰山学者工程(tsqn202306160);江苏省卓越博士后计划(338057) |
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| Author | Institution |
| JING Chaojie | Weathering Test and Research Center of Science Technology and Industry for National Defense, Southwest Institute of Technology and Engineering, Chongqing 400039, China |
| FANG Bo | School of Chemistry and Chemical Engineering, Yantai University, Shandong Yantai 264005, China |
| ZHAO Fangchao | Weathering Test and Research Center of Science Technology and Industry for National Defense, Southwest Institute of Technology and Engineering, Chongqing 400039, China |
| ZHAO Yang | Weathering Test and Research Center of Science Technology and Industry for National Defense, Southwest Institute of Technology and Engineering, Chongqing 400039, China |
| YANG Xiaokui | Weathering Test and Research Center of Science Technology and Industry for National Defense, Southwest Institute of Technology and Engineering, Chongqing 400039, China |
| CHEN Xueqing | AVIC China Aero-Polytechnology Establishment, Beijing 100028, China |
| ZHOU Kun | Weathering Test and Research Center of Science Technology and Industry for National Defense, Southwest Institute of Technology and Engineering, Chongqing 400039, China |
| LIU Jie | School of Chemistry and Chemical Engineering, Yantai University, Shandong Yantai 264005, China |
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| 中文摘要: |
| 目的 探究深海静水压力作为单一因素影响涂层/金属体系的失效过程。方法 在深海环境模拟实验装置中开展环氧涂层/907A低合金钢体系的浸泡实验，从电化学阻抗谱、涂层湿附着力、涂层微观形貌及其化学结构等方面分析涂层的失效机理。结果 当静水压力为0.1 MPa和15 MPa时，涂层阻抗值分别下降至3.83×106 Ω∙cm2和6.28×104 Ω∙cm2，涂层湿附着力分别下降至2.76 MPa和2.31 MPa。在不同静水压力下，水在涂层中的前期扩散形式均符合Fick扩散定律，而涂层下水的扩散系数从1.05×10−9 cm2/s增加至2.39× 10−9 cm2/s。随着静水压力的升高，环氧涂层表面的孔隙以及裂纹不断发展并出现了鼓泡。在静水压力为0.1 MPa条件下腐蚀产物以γ-FeOOH为主，静水压力升高后腐蚀产物Fe3O4含量明显增加，除锈后的腐蚀坑直径由15 μm增加至 25 μm。结论 高静水压力可以加速腐蚀性介质向涂层内部以及涂层/金属界面的渗透，涂层湿附着力迅速下降，涂层失效更加严重。高静水压力能够促进腐蚀产物中高电化学活性Fe3O4的生成。此外，静水压力下涂层失效的主要原因是物理结构受到破坏。 |
| 英文摘要: |
| Applying coatings on metal surfaces is one of the most effective ways to protect metals. In the field of marine corrosion protection, epoxy glass flake coatings with lamellar structures that hinder the transmission of corrosive media have been extensively explored and used. The work aims to investigate the failure behavior and failure mechanism of the coatings under deep-sea hydrostatic pressure. The epoxy glass flake coating/907A low alloy steel system was immersed by the simulation test device of the deep-sea environment. The failure mechanism of the coating/metal system was analyzed from the perspectives of EIS, wet adhesion, cathodic delamination diameter, chemical structure and microscopic morphology of the coatings, microscopic morphology of the metal surface before and after rust removal, and corrosion products of the metal. EIS was used to test the anti-corrosion properties of the coatings. Following the ASTM D4541, a pull-off adhesion tester was used to test wet adhesion, and the diameter of the alloy was 20 mm. At the end of the test, the impedance values of the coatings decreased to 3.83×106 Ω∙cm2 and 6.28×104 Ω∙cm2 at 0.1 MPa and 15 MPa hydrostatic pressure, respectively. The wet adhesion of the coatings from original 6.52 MPa decreased to 2.76 MPa and 2.31 MPa and the wet adhesion loss values were 57.67% and 64.57%, respectively. The cathodic delamination diameter of the coatings increased by 1.2 mm and 1.5 mm under 0.1 MPa and 15 MPa hydrostatic pressure, respectively. At the initial stage of immersion, the diffusion process of water in the coatings conformed to Fick 's diffusion law, and the diffusion coefficients of water in the coating increased from 1.05×10−9 cm2/s to 2.39× 10−9 cm2/s under 0.1 MPa and 15 MPa hydrostatic pressure. Small pores and cracks appeared on the coating surface under 0.1 MPa hydrostatic pressure, while the pores on the coating surface were more obvious and small bubbles appeared on the coating surface under 15 MPa hydrostatic pressure. Uniformly distributed corrosion products were observed on the surface of the metal under 0.1 MPa hydrostatic pressure. Under 0.1 MPa hydrostatic pressure, small amounts of corrosion products were observed on the metal surface and γ-FeOOH had the highest percentage in the corrosion products and the maximum corrosion pit diameter after rust removal was about 15 μm. Under 15 MPa hydrostatic pressure, multiple corrosion products were observed on the metal surface. In the corrosion products, there was a significant increase in the amount of Fe3O4 which had high electrochemical activity and an extensive decrease in the amount of γ-FeOOH, and the diameter of corrosion pits after rust removal was about 25 μm. The analytical results indicate that corrosive media such as water and oxygen can accelerate diffusion into the coating/metal interface under high hydrostatic pressure, leading to a further decrease in the wet adhesion of the coatings, an increase in the cathodic delamination diameter of the coatings, and a more serious coating failure. At the same time, high hydrostatic pressure can promote the formation of Fe3O4 with high electrochemical activity in the corrosion products, which leads to more serious metal corrosion. In addition, the main reason for the failure of the coatings under high hydrostatic pressure is the destruction of its physical structure. |
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