| 王玲,陆忠海,刘杰,何建新.环氧涂层在不同温度海水中的失效行为研究[J].装备环境工程,2019,16(4):113-118. WANG Ling,LU Zhong-hai,LIU Jie,HE Jian-xin.Failure Behavior of Epoxy Coatings in Seawater at Different Temperatures[J].Equipment Environmental Engineering,2019,16(4):113-118. |
| 环氧涂层在不同温度海水中的失效行为研究 |
| Failure Behavior of Epoxy Coatings in Seawater at Different Temperatures |
| 投稿时间：2018-10-30 修订日期：2019-04-25 |
| DOI：10.7643/ issn.1672-9242.2019.04.021 |
| 中文关键词: 环氧涂层 海水 不同温度 电化学阻抗谱 等效电路 |
| 英文关键词:epoxy coating seawater different temperature electrochemical impedance spectroscopy equivalent circuits |
| 基金项目:国防技术基础项目（No. JSHS2015209C003 &JSHS2015209B001）；山东省自然科学基金项目（ZR2016BQ15）；装备预研船舶重工联合基金项目（6141B04080206） |
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| Author | Institution |
| WANG Ling | 1. China Weathering Test and Research Center of Science Technology and Industry for National Defense, Southwest Technology and Engineering Research Institute, Chongqing 400039, China |
| LU Zhong-hai | 2. College of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China |
| LIU Jie | 2. College of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China |
| HE Jian-xin | 1. China Weathering Test and Research Center of Science Technology and Industry for National Defense, Southwest Technology and Engineering Research Institute, Chongqing 400039, China |
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| 中文摘要: |
| 目的 研究环氧涂层在不同温度海水环境中的腐蚀失效行为。方法 采用电化学阻抗谱（EIS）技术研究两种海水环境中涂层的EIS特征，同时分析涂层电阻和涂层电容的变化，以研究环氧涂层防护性能随浸泡时间的变化。结果 涂层在15 ℃海水中浸泡1440 h时，阻抗值下降至106 Ω?cm2以下，而在30 ℃海水中仅浸泡72 h时，阻抗值就已下降至106 Ω?cm2。随着浸泡时间的增加，涂层在15 ℃海水中的EIS响应由高阻抗的单容抗弧变为双容抗弧，而在30 ℃的海水中，EIS响应首先由单容抗弧演变为双容抗弧，随后又出现了明显的Warburg扩散阻抗特征。涂层电容在两种温度的海水中均呈上升趋势，电阻呈下降趋势。结论 涂层在30 ℃海水中的劣化速度加快，是因为升高温度能够降低涂层与金属间的结合力，加快了海水向涂层内部渗透的速率。由于温度的升高加快了溶解氧的扩散速率，使得氧扩散过程成为腐蚀反应的控制步骤，从而导致了涂层在30 ℃海水中的EIS响应出现了明显的Warburg扩散阻抗特征。当环氧涂层在15 ℃与30 ℃的海水中浸泡1800 h时，其防护性能的变化可以分为快速下降、缓慢下降、趋于稳定三个阶段。 |
| 英文摘要: |
| Objective To study failure behaviors of epoxy coatings in seawater at different temperatures. Methods EIS tech-nique was used to study the EIS characteristics of coatings in two seawater environments. Meanwhile, changes of coating re-sistance and coating capacitance were analyzed to study protective properties of the epoxy coatings with immersion time. Results When the coating was immersed in seawater at 15 ℃ for 1440 h, the impedance value dropped below 106 Ω?cm2; while the impedance value dropped to 106 Ω?cm2 when the coating was immersed for only 72 h in seawater at 30 ℃. With the increase of immersion time, the EIS of the coating immersed in seawater at 15 ℃ changed from a single capacitive loop to double capacitive loop, and the EIS of the coating immersed in seawater at 30 ℃ firstly evolved from a single capacitive loop to double capacitive loop, followed by obvious Warburg resistance characteristic. When the coatings were immersed in seawater at two temperatures, the coating capacitance presented a rising tendency, and the coating resistance showed a decreasing tendency. Conclusion The degradation rate of epoxy coatings in seawater at 30 ℃ is accelerated, which is attributed to that the high temperature reduces the binding force between the coating and the metal, and speeds up the rate of permeation of seawater into the interior of the coating. As the temperature rises, the diffusion process of dissolved oxygen is also accelerated, and thus the oxygen diffusion process becomes a control step of the corrosion reaction, which leads to obvious Warburg resistance characteristics of the EIS of the coating immersed in seawater at 30 ℃. When the epoxy coating is immersed in seawater at 15 ℃ and 30 ℃ for 1800 h, the changes of protective properties could be divided into three stages: rapid decline, slow decline, and stabilization. |
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