交变应力频率对E690钢在3.5%NaCl溶液中腐蚀电化学行为的影响

doi:10.11902/1005.4537.2019.259

中国腐蚀与防护学报

2021, Vol. 41

Issue (2): 226-232 DOI: 10.11902/1005.4537.2019.259

研究报告

本期目录 | 过刊浏览

交变应力频率对E690钢在3.5%NaCl溶液中腐蚀电化学行为的影响

张腾, 刘静(

), 黄峰, 胡骞, 戈方宇

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 Alternating Stress Frequency on Corrosion Electrochemical Behavior of E690 Steel in 3.5%NaCl Solution

ZHANG Teng, LIU Jing(

), HUANG Feng, HU Qian, GE Fangyu

Hubei Engineering Technology Research Center of Marine Materials and Service Safety, State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

全文: PDF(11381 KB) HTML

摘要:

采用电化学技术与微观形貌观察，研究了不同频率 (0.1，0.5，1.0，1.3，1.8和2.0 Hz) 弹性交变应力下E690高强海洋工程用钢在3.5% (质量分数) NaCl溶液中的腐蚀电化学行为，探讨了加载频率对腐蚀反应机理的影响。结果表明，存在一个临界频率，将交变应力作用下腐蚀电化学行为分为两个不同的阶段。加载频率在临界频率以下时，随着弹性交变应力加载频率的增大，E690钢的应变速率峰值增大，钢的表面产生活性位点增多，腐蚀过程主要受活化控制，腐蚀速率和局部腐蚀面积均随着加载频率的提高而增大。加载频率超过临界频率时，腐蚀过程主要受扩散控制，腐蚀速率和局部腐蚀面积不受加载频率变化的影响。

关键词 ：交变应力, 加载频率, E690钢, 电化学行为

Abstract：

The corrosion behavior of E690 steel in 3.5% (mass fraction) NaCl solution by applied elastic alternating stresses of different frequencies (0.1, 0.5, 1.0, 1.3, 1.8 and 2.0 Hz) was studied by electrochemical test and surface characterization. Results show that there is a critical loading frequency for the applied alternating stress that divides the corrosion electrochemical behavior into two different regions. When loading frequency is below the critical frequency, the maximum strain rate of E690 steel and the number of active sites on steel surface increases with the increasing loading frequency. The corrosion process is mainly controlled by activation. The corrosion rate and the portion of localized corrosion area increase with the increase of the loading frequency. When loading frequency is higher than the critical frequency, the corrosion process is mainly controlled by diffusion. Hence, the loading frequency has little impact on the corrosion rate and localized corrosion area.

Key words： alternating stress loading frequency E690 steel electrochemical behavior

收稿日期: 2019-12-16

ZTFLH:

TG172

基金资助:国家自然科学基金(51871172)

通讯作者: 刘静 E-mail: liujing@wust.edu.cn

Corresponding author: LIU Jing E-mail: liujing@wust.edu.cn

作者简介: 张腾，男，1994年生，硕士生

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引用本文:

张腾, 刘静, 黄峰, 胡骞, 戈方宇. 交变应力频率对E690钢在3.5%NaCl溶液中腐蚀电化学行为的影响[J]. 中国腐蚀与防护学报, 2021, 41(2): 226-232.
Teng ZHANG, Jing LIU, Feng HUANG, Qian HU, Fangyu GE. Effect of Alternating Stress Frequency on Corrosion Electrochemical Behavior of E690 Steel in 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(2): 226-232.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.259 或 https://www.jcscp.org/CN/Y2021/V41/I2/226

图1 E690钢微观组织形貌

图2 用于交变应力下电化学实验的试样和电化学测试装置示意图

图3 不同加载频率下E690钢在3.5%NaCl溶液中的开路电位随时间的变化

图4 不同加载频率下E690钢在3.5%NaCl溶液中的腐蚀电流密度和极化电阻

图5 不同加载频率下E690钢在3.5%NaCl溶液中的极化曲线

表1 不同加载频率下E690钢在3.5%NaCl溶液中极化曲线拟合参数

图6 不同加载频率下E690钢在3.5%NaCl溶液中的电化学阻抗谱和等效电路

表2 不同加载频率下E690钢在3.5%NaCl溶液中的EIS拟合参数值

图7 E690钢在3.5%NaCl溶液中不同加载频率下腐蚀24 h后的表面形貌

图8 不同加载频率下E690钢在3.5%NaCl溶液中腐蚀24 h后基体的腐蚀形貌

图9 交变应力频率对E690钢在3.5%NaCl溶液中腐蚀速率及腐蚀反应控制步骤的影响机制示意图

图10 不同加载频率下应变速率随时间的变化

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