东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (1): 38-42.DOI: 10.12068/j.issn.1005-3026.2015.01.009

• 材料与冶金 • 上一篇    下一篇

铁素体不锈钢在盐酸溶液中的腐蚀过程

解琼， 史培阳， 姜茂发   

  1. (东北大学 多金属共生矿生态化冶金教育部重点实验室， 辽宁 沈阳110819)
  • 收稿日期:2013-12-02 修回日期:2013-12-02 出版日期:2015-01-15 发布日期:2014-11-07
  • 通讯作者: 解琼
  • 作者简介:解琼(1984-)，女，辽宁沈阳人，东北大学博士研究生; 姜茂发(1955-)，男，山东栖霞人，东北大学教授，博士生导师.
  • 基金资助:
    中央高校基本科研业务费专项资金资助项目(N110602001).

Corrosion Process of Ferritic Stainless Steel in Hydrochloric Acid Solution

XIE Qiong， SHI Pei-yang， JIANG Mao-fa   

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Ores，Ministry of Education， Northeastern University， Shenyang 110819， China.
  • Received:2013-12-02 Revised:2013-12-02 Online:2015-01-15 Published:2014-11-07
  • Contact: XIE Qiong
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摘要： 利用电化学工作站，结合微观腐蚀形貌分析，研究了铁素体不锈钢在盐酸溶液中的腐蚀过程.结果表明:铁素体不锈钢在盐酸溶液中的腐蚀过程分为3个阶段:表面钝化膜的穿透、腐蚀产物膜的增厚以及阴阳极反应平衡.不锈钢在表面钝化膜的穿透和腐蚀产物膜的增厚阶段仅发生均匀腐蚀，而在反应平衡阶段不锈钢表面出现大量的晶间腐蚀和少量的点蚀.当盐酸质量分数大于10%时，铁素体不锈钢在盐酸溶液中的极化曲线钝化区完全消失，其腐蚀过程主要受阳极控制.随着盐酸质量分数的增大，溶液电阻Rs和电极反应的电荷转移电阻Rt均逐渐减小，同时腐蚀电极表面双电层结构中的充放电能力不发生改变.

关键词: 铁素体不锈钢, 盐酸酸洗, 电化学腐蚀, 极化曲线, 阻抗图谱

Abstract: The corrosion process of ferritic stainless steel in hydrochloric acid solution was researched by electrochemical workstation and microstructure analysis. The results showed that the corrosion process of ferritic stainless steel in hydrochloric acid solution includes three periods: penetrating of ions into the passive film， thickening of corrosion production film and equilibrium of polarizing reactions. Uniform corrosion is the only way found in the periods of penetrating the passive film and thickening of corrosion production film， while abundant intercrystalline corrosion and a few pitting corrosions appear in the period of equilibrium of polarizing reactions. When the hydrochloric acid is above 10%， the corrosion process is completely controlled by the anodic reactions and the passive zone totally disappeared. Both the solution resistance Rs and the charge-transfer resistance Rt decrease with the increase of the concentration of hydrochloric acid， meanwhile the capacities of charging and discharging of the electric double layer in the surface of the stainless steel anode do not change obviously.

Key words: ferritic stainless steel, hydrochloric acid pickling, electrochemical corrosion, polarization curve, EIS(electrochemical impedence spectroscopy)

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