夏江敏,李竹影,王晓强,陈页骍,林育锋.钢在流动人造海水中的冲刷腐蚀行为与防护研究[J].表面技术,2021,50(11):306-312. XIA Jiang-min,LI Zhu-ying,WANG Xiao-qiang,CHEN Ye-xing,LIN Yu-feng.Study on Erosion and Corrosion Behavior and Protection of Steel in Flowing Artificial Seawater[J].Surface Technology,2021,50(11):306-312 |
钢在流动人造海水中的冲刷腐蚀行为与防护研究 |
Study on Erosion and Corrosion Behavior and Protection of Steel in Flowing Artificial Seawater |
投稿时间:2021-01-27 修订日期:2021-04-07 |
DOI:10.16490/j.cnki.issn.1001-3660.2021.11.032 |
中文关键词: 钢 腐蚀机理 冲刷腐蚀 点蚀 电化学噪声 |
英文关键词:steel corrosion mechanism erosion corrosion pitting corrosion electrochemical noise |
基金项目: |
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Author | Institution |
XIA Jiang-min | College of Naval Architecture & Ocean Engineering, Naval Univ. of Engineering, Wuhan 430033, China |
LI Zhu-ying | College of Naval Architecture & Ocean Engineering, Naval Univ. of Engineering, Wuhan 430033, China |
WANG Xiao-qiang | College of Naval Architecture & Ocean Engineering, Naval Univ. of Engineering, Wuhan 430033, China |
CHEN Ye-xing | College of Naval Architecture & Ocean Engineering, Naval Univ. of Engineering, Wuhan 430033, China |
LIN Yu-feng | College of Naval Architecture & Ocean Engineering, Naval Univ. of Engineering, Wuhan 430033, China |
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中文摘要: |
目的 研究钢在流动人造海水中的冲刷腐蚀行为及防护方法。方法 采用自制的冲刷试验平台,利用扫描电镜、电化学阻抗、电化学噪声、最大熵值变换等方法,分析钢在流动人造海水中各阶段的冲刷腐蚀行为特征,验证材料表面涂覆新型环氧涂层的方法对提高钢耐流动人造海水冲刷腐蚀的有效性。结果 钢在2 m/s流动人造海水中30 d的冲刷腐蚀行为特征可以分为三个阶段,第一阶段,金属开始发生点蚀,生成网状腐蚀产物,反应电阻上升后持续减小至400 Ω,电化学噪声电位发生负移,SE值较大,电化学腐蚀速率增强;第二阶段,点蚀速率减弱,开始出现颗粒状腐蚀产物,反应电阻相对稳定在300 Ω左右,电化学噪声电位发生正移,SE值数值较小,电化学腐蚀速率保持相对稳定;第三阶段,外层腐蚀产物剥离,反应电阻和SE值发生较大的波动,冲刷作用导致了腐蚀产物的快速形成和脱离。涂覆绝缘涂层的钢试样总电阻稳定在6.0×105 Ω左右,高出无涂层裸露试样总电阻(1.0×103 Ω)2个数量级。结论 钢在2 m/s流动人造海水中30 d的冲刷腐蚀行为特征可以分为加速腐蚀-动态平衡-平衡破坏三个阶段,新型环氧涂层具有较好的耐冲刷腐蚀性能。 |
英文摘要: |
This paper aims to study the erosion and corrosion behavior of steel in flowing artificial seawater and its protection methods. Self-made scour test platformwas adopted, methods of scanning electron microscopy, electrochemical impedance, electrochemical noise, maximum entropy transformation were used to analyze the erosion and corrosion behavior characteristics of steel in flowing artificial seawater at various stages, and it was verified that the surface of the materialcoated with a new oxygen coating method could improve the effectiveness of steel against erosion and corrosion by flowing artificial seawater. The erosion corrosion behavior of steel in 2 m/s flowing artificial seawater for 30 days can be divided into three stages:In the first stage, the metal began to undergo pitting corrosion and formed networked corrosion products, and the reaction resistance continued to decrease to 400 Ω, The electrochemical noise potential had a negative shift, the value of SE was larger, the electrochemical corrosion rate was enhanced; In the second stage, the pitting corrosion rate was weakened, and granular corrosion products began to appear, the reaction resistance was relatively stable at about 300 Ω, and the electrochemical noise potential had a positive shift. The value of SE was small, and the rate of electrochemical corrosion remained relatively stable; In the third stage, the corrosion products of the outer layer peeedl off, and the reaction resistance and the value of SE fluctuated greatly, and the erosion effect leaded to the rapid formation and separation of corrosion products. The total resistance of the steel sample coated with an insulating coating was stable at about 6.0×105 Ω, which was two orders of magnitude higher than the total resistance 1.0×103 Ω of the uncoated bare sample. The erosion corrosion behavior of steel in 2 m/s artificial seawater for 30 days can be divided into three stages:accelerated corrosion-dynamic equilibrium-equilibrium destruction. The new epoxy coating has good erosion corrosion resistance. |
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