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  • ISSN：0577-6686
机械工程学报

机械工程学报 ›› 2015, Vol. 51 ›› Issue (4): 58-65.doi: 10.3901/JME.2015.04.058

• 材料科学与工程 • 上一篇    下一篇

不同敏化温度和冷凝液成分对430铁素体不锈钢电化学腐蚀行为影响

郝文魁1 刘智勇1 黄天杰2 郭 静1 杜翠薇1 李晓刚1   

  1. 1. 北京科技大学腐蚀与防护中心 北京 100083
    2. 吉林油田公司采油工艺研究院 松原 138000
  • 出版日期:2015-02-20 发布日期:2015-02-20
  • 基金资助:
    国家科技基础性工作专项(2012FY113000)、国家自然科学基金(50901041)和国家科技支撑计划(2011BAK06B01-01)资助项目

Effects of Sensitized under Different Temperature and Composition of Condensate on Electrochemical Behavior of 430 Ferritic Stainless Steel

HAO Wenkui1 LIU Zhiyong1 Huang Tianjie2 GUO Jing1 DU Cuiwei1 LI Xiaogang1   

  1. 1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083
    2. Oil Production Technology Institute, Jilin Oil Field Company, Songyuan 138000
  • Online:2015-02-20 Published:2015-02-20

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摘要： 利用电化学测量技术，研究不同温度敏化后的430铁素体钢在模拟汽车冷凝液环境中的电化学行为及汽车冷凝液成分变化对430铁素体不锈钢电化学行为的影响。结果表明，850～1 150 ℃的敏化温度范围内，430铁素体不锈钢随着敏化温度的升高，晶粒度逐渐增大，在模拟汽车冷凝液环境中，零电流电位和电荷转移电阻逐渐降低，耐蚀性下降；430铁素体不锈钢在Cl–分别与SO42–或SO32–共存的条件下，比在Cl–与CO32–共存环境中更容易发生腐蚀，腐蚀速度更高；Cl–存在的溶液中，SO32–具有较大的加速腐蚀作用，且随着SO32–浓度的增加，维钝电流升高，腐蚀过程有逐渐加剧的趋势；Cl–和SO32–共存溶液中，CO32–在一定程度上抑制了430铁素体不锈钢腐蚀过程的进行，降低了腐蚀速度，SO42–加速了腐蚀过程的发生，提高了腐蚀速度。

关键词: 电化学, 冷凝液, 模拟腐蚀, 铁素体不锈钢

Abstract: Electrochemical behavior of the 430 ferritic stainless steel (FSS), sensitized under different temperature, and the effect of composition of condensate on the electrochemical behavior are investigated in simulated automotive condensate environment. Results show that the 430 FSS sensitized under temperature within range of 850 ℃ to 1 150 ℃ is characterized by increasing grain size along with sensitization temperature, and both the corrosion potential and the charge transfer resistance of it decreases in the simulated solution, in solution containing Cl– ion, the existence of SO42– or SO32– is found to be able to accelerate corrosion processes of 430 FSS other than that of CO32–. In solution with Cl–, SO32– plays an important role in accelerating the occurrence of corrosion, which results in the increase of passive current density and the corrosion rate with the increase of concentration of SO32–. In addition, the solution contains both Cl– and SO32–, CO32– inhibites the corrosion process of the ferritic stainless steel to reduce the corrosion rate, while SO42– increases the corrosion rate.

Key words: condensate, electrochemical, ferritic stainless steel, simulate the corrosion

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