| 引用本文: | 王向军,徐庆林,宋玉苏,等.921A钢在海水中腐蚀的力学化学效应.[J].国防科技大学学报,2021,43(5):160-167.[点击复制] |
| WANG Xiangjun,XU Qinglin,SONG Yusu,et al.Mechanochemical effect of 921A steel corrosion in seawater[J].Journal of National University of Defense Technology,2021,43(5):160-167[点击复制] |
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| 921A钢在海水中腐蚀的力学化学效应 |
| 王向军1,徐庆林1,宋玉苏2,王海光1 |
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(1. 海军工程大学 电气工程学院, 湖北 武汉 430033;2. 海军工程大学 基础部, 湖北 武汉 430033)
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| 摘要: |
| 为了研究弹性应力和弹塑性应变对921A船体钢在模拟海水中腐蚀行为的影响,采用自制的载荷-电化学实验装置对921A钢在载荷与腐蚀介质协同作用时的开路电位、动电位极化曲线和电化学阻抗谱等电化学性能进行了测试,并由电化学阻抗谱拟合得到的电荷传递电阻定义载荷下的腐蚀速率修正因子,将实验得到的腐蚀速率修正因子与理论值进行了对比。结果表明:弹性拉应力与弹性压应力对力学化学效应的影响具有对称性。力学化学效应随着弹性应力的增大而增大,随着弹塑性应变的增大先增大后减小。弹塑性应变对力学化学效应的影响远远大于弹性应力的影响。在研究范围内,弹塑性应变引起的腐蚀电位负移量最大为62.6 mV,相应的腐蚀速率修正因子高达4.113,而弹性应力引起的腐蚀电位负移量最大为24.5 mV,相应的腐蚀速率修正因子为1.746。由此可见,应力应变对921A钢在海水中腐蚀行为的影响不容忽视。 |
| 关键词: 腐蚀 力学化学效应 弹性应力 弹塑性应变 电化学性能 921A钢 |
| DOI：10.11887/j.cn.202105019 |
| 投稿日期：2020-03-19 |
| 基金项目:国家自然科学基金资助项目(41476153) |
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| Mechanochemical effect of 921A steel corrosion in seawater |
| WANG Xiangjun1, XU Qinglin1, SONG Yusu2, WANG Haiguang1 |
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(1. College of Electrical Engineering, Naval University of Engineering, Wuhan 430033, China;2. Department of Basic Courses, Naval University of Engineering, Wuhan 430033, China)
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| Abstract: |
| In order to study the effect of elastic stress and elastoplastic strain on the corrosion behavior of 921A steel in simulated seawater, the electrochemical properties of 921A steel under the synergistic action of load and corrosion, such as open circuit potential, potentiodynamic polarization curves and EIS(electrochemical impedance spectroscopy), were tested by a homemade load-electrochemical experimental device. The corrosion rate correction factor under stress was defined by the charge transfer resistance obtained by EIS, and the experimental corrosion rate correction factor was compared with the theoretical value. Results show that the effects of elastic tensile stress and the elastic compressive stress on the mechanochemical effect are symmetrical. The mechanochemical effect increases with the increase of the elastic stress, and increases first and then decreases with the increase of the elastoplastic strain. The effect of the elastoplastic strain on mechanochemical effect is far greater than that of the elastic stress. In the scope of this study, the maximum negative shift of corrosion potential caused by the elastoplastic strain is 62.6 mV, and the corresponding corrosion rate correction factor is 4.113, while those caused by the elastic stress are 24.5 mV and 1.746, respectively. Therefore, the effect of stress and strain on the corrosion behavior of 921A steel in seawater cannot be ignored. |
| Keywords: corrosion mechanochemical effect elastic stress elastoplastic strain electrochemical properties 921A steel |
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