• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2016, Vol. 52 ›› Issue (16): 33-41.doi: 10.3901/JME.2016.16.033

• 材料科学与工程 • 上一篇    下一篇

SO2质量分数对污染海洋大气环境中高强钢E690腐蚀行为的影响*

马宏驰1, 刘智勇1, 杜翠薇1, 杨小佳1, 李晓刚1,2, 逄昆1   

  1. 1. 北京科技大学腐蚀与防护中心 北京 100083;
    2. 中国科学院宁波材料技术与工程研究所 宁波 315201
  • 出版日期:2016-08-20 发布日期:2016-08-20
  • 作者简介:

    马宏驰,男,1985年出生,博士研究生。主要研究方向为金属腐蚀与防护。

    E-mail:mahongchi128@163.com

    杜翠薇(通信作者),女,1972年出生,博士,教授,博士研究生导师。主要研究方向为材料腐蚀与防护。

    E-mail:dcw@ustb.edu.cn

  • 基金资助:
    * 国家重点基础研究发展计划(973计划,2014CB643300)和国家自然科学基金(51471034,51131005,51171025)资助项目; 20150807收到初稿,20160508收到修改稿;

Effect of SO2 Content on Corrosion Behavior of High-strength Steel E690 in Polluted Marine Atmosphere

MA Hongchi1, LIU Zhiyong1, DU Cuiwei1, YANG Xiaojia1, LI Xiaogang1,2, PANG Kun1   

  1. 1. Corrosion & Protection Center, University of Science and Technology Beijing, Beijing 100083;
    2. Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201
  • Online:2016-08-20 Published:2016-08-20

摘要:

采用干湿交替腐蚀试验方法,结合电化学测试、锈层截面和腐蚀产物X射线衍射(X-ray diffraction,XRD)分析,研究SO2质量分数对E690钢在模拟污染海洋大气环境中腐蚀行为的影响。结果表明,海洋大气环境中的SO2改变了E690钢海洋大气腐蚀的电化学机制,使得极化曲线的阳极分支由弱钝化特征转变为活性溶解特征,阴极分支由氧扩散过程控制转变为氧扩散和析氢反应共同控制,因而大大促进了阳极和阴极的电化学反应过程。同时,SO2又显著促进α-FeOOH的生成和Ni、Cr合金元素在内锈层中的富集,大大促进锈层的致密化,使均匀腐蚀速率逐渐减低,并促进锈层底部点蚀坑的生长。随着模拟溶液中NaHSO3浓度的增加,E690钢在60 d内的平均腐蚀速率逐渐增加,当NaHSO3浓度达到0.03 mol/L时,又出现一定程度的降低;同时,锈层底部的点蚀坑随NaHSO3浓度的增加显著长大。

关键词: SO2, 干湿交替腐蚀, 污染海洋大气, 锈层, E690钢

Abstract:

Dry/wet cyclic corrosion tests, combined with electrochemical measurements, cross-sectional morphology observation of rust layer and X-ray diffraction (XRD) analysis of corrosion products, are conducted to investigate the effect of SO2 content on corrosion behaviors of E690 steel in simulated polluted marine atmosphere. The results show that SO2 can change the electrochemical corrosion mechanism of E690 steel in marine atmosphere. The anodic branch is transformed from weak passivation to active dissolution feature while the cathodic branch is transformed from oxygen diffusion process to mixed-control of oxygen reduction reaction and hydrogen evolution reaction, leading to great acceleration of anodic and cathodic reaction process. Meanwhile, SO2 can significantly promote the formation of α-FeOOH and enrichment of Nickel and Chromium in the inner rust layer, resulting in the decrease of uniform corrosion rate and growth of corrosion pits under the rust layer. With the increase of NaHSO3 concentration, the average corrosion rate of E690 steel within 60 days in simulated marine atmosphere is increased accordingly, and then appears a certain degree of decline when the concentration of NaHSO3 obtained 0.03 mol/L. Meanwhile, the corrosion pits under the rust layer grew up significantly with the increase of NaHSO3 concentration.

Key words: dry/ wet cyclic corrosion, polluted marine atmosphere, rust layer, sulfur dioxide, E690 steel