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中国腐蚀与防护学报  2021, Vol. 41 Issue (2): 187-194    DOI: 10.11902/1005.4537.2020.022
  研究报告 本期目录 | 过刊浏览 |
交变载荷频率对MS X65管线钢在H2S介质中腐蚀电化学行为影响
戈方宇, 黄峰(), 袁玮, 肖虎, 刘静
武汉科技大学 省部共建耐火材料与冶金国家重点实验室 湖北省海洋工程材料及 服役安全工程技术研究中心 武汉 430081
Effect of Cyclic Stress Frequency on Corrosion Electrochem-ical Behavior of MS X65 Pipeline Steel in H2S Containing Medium
GE Fangyu, HUANG Feng(), YUAN Wei, XIAO Hu, LIU Jing
The State Key Laboratory of Refractories and Metallurgy, Hubei Engineering Technology Research Center of Marine Materials and Service Safety, Wuhan University of Science and Technology, Wuhan 430081, China
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摘要: 

采用动电位极化、线性极化、电化学阻抗等电化学测试技术，研究了不同应力比 (R) 下MS X65管线钢在含H2S介质中的腐蚀电化学行为随交变载荷频率变化的规律。结果表明：自腐蚀电流密度Icorr、电荷转移电阻Rct、线性极化电阻Rp等腐蚀电化学动力学参数均随着交变载荷频率的增加，先上升或下降，后趋于稳定，存在一个临界交变频率；且由R=0.4时的0.25 Hz增大到R=0.85时的1 Hz，这与不同应力比和交变频率对电极表面电化学活性反应位点和腐蚀介质中阴极反应物扩散速率的交互影响有关。
关键词 ： MS X65管线钢,  交变载荷,  临界交变频率,  应力比    
Abstract：

The electrochemical behavior of MS X65 pipeline steel in H2S containing medium by different stress ratios (R) was investigated via electrochemical test techniques such as dynamic potential polarization, linear polarization, and electrochemical impedance. The results indicated that electrochemical kinetic parameters such as free-corrosion current density Icorr, electron transfer resistance Rct, and linear polarization resistance Rp all increase or decrease first with the increase of the cyclic stress frequency, and then stabilized by a critical cyclic stress frequency. The critical frequency increased from 0.25 Hz for R=0.4 to 1 Hz for R=0.85, which would be related to the interactive influence of different stress ratios and cyclic stress frequencies on the electrochemically active reaction sites on the electrode surface and the diffusion rate of cathode reactants.
Key words： MS X65 pipeline steel    cyclic stress    critical cyclic stress frequency    stress ratio
收稿日期: 2020-02-26     
ZTFLH:  TG172  
基金资助:国家自然科学基金(51871172)
通讯作者: 黄峰     E-mail: huangfeng@wust.edu.cn
Corresponding author: HUANG Feng     E-mail: huangfeng@wust.edu.cn
作者简介: 戈方宇，男，1995年生，硕士生
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引用本文:

戈方宇, 黄峰, 袁玮, 肖虎, 刘静. 交变载荷频率对MS X65管线钢在H2S介质中腐蚀电化学行为影响[J]. 中国腐蚀与防护学报, 2021, 41(2): 187-194.
Fangyu GE, Feng HUANG, Wei YUAN, Hu XIAO, Jing LIU. Effect of Cyclic Stress Frequency on Corrosion Electrochem-ical Behavior of MS X65 Pipeline Steel in H2S Containing Medium. Journal of Chinese Society for Corrosion and protection, 2021, 41(2): 187-194.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.022      或      https://www.jcscp.org/CN/Y2021/V41/I2/187

图1  MS X65管线钢显微组织图
图2  MS X65管线钢的工程应力-应变曲线
图3  MS X65管线钢板状拉伸样尺寸交变载荷下电化学实验装置示意图
图4  不同应力比及频率下的开路电位
图5  不同应力比下开路电位随交变载荷频率变化折线图
图6  MS X65管线钢在不同应力比及频率下的极化曲线
Stress ratiofHzEcorr / V (vs SCE)IcorrA·cm-2Ic,dA·cm-2
0.40.05-0.7103.95×10-57.54×10-5
0.1-0.7064.09×10-58.50×10-5
0.25-0.6831.29×10-41.45×10-4
0.5-0.6781.22×10-41.39×10-4
1.0-0.6851.21×10-41.31×10-4
1.5-0.6811.24×10-41.46×10-4
0.850.05-0.7151.22×10-55.45×10-5
0.1-0.6631.85×10-41.92×10-4
0.25-0.6681.72×10-41.83×10-4
0.5-0.6572.47×10-42.56×10-4
1.0-0.6533.19×10-43.50×10-4
1.5-0.6523.01×10-43.53×10-4
表1  MS X65管线钢在不同应力比及频率下的极化曲线拟合结果
图7  MS X65管线钢在应力比0.4下的阻抗谱
图8  MS X65管线钢在应力比0.85下的阻抗谱
图9  拟合阻抗谱所用电路图
图10  不同应力比及频率下MS X65管线钢的阻抗值
图11  MS X65管线钢在不同应力比及频率下的线性极化曲线
图12  不同应力比下极化电阻随载荷频率的变化规律
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