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

发布时间：2018-05-16 11:24

本文选题：铁素体不锈钢 + 电化学　；参考：《机械工程学报》2015年04期

【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。
[Abstract]:The electrochemical behavior of 430 ferrite steel sensitized at different temperatures in simulated automotive condensate environment and the effect of the composition of automobile condensate on the electrochemical behavior of 430 ferrite stainless steel were studied by electrochemical measurement technique. The results show that the grain size of ferrite stainless steel increases with the increase of sensitizing temperature, and the zero current potential and charge transfer resistance decrease gradually in the simulated automobile condensate environment. The corrosion resistance of ferrite stainless steel decreased in corrosion resistance was more likely to occur in the presence of Cl ~ (2 +) and SO42 ~ (2 +) or SO32 ~ (2 +) than in the co-existing environment of Cl ~ (2 +) and CO32 ~ (2 +). In the solution with higher corrosion rate, so _ (32) O _ (2) can accelerate the corrosion, and with the increase of the concentration of SO32 ~ (2 +), the obtuse current increases. The corrosion process of 430 ferrite stainless steel has been gradually intensified. The corrosion process of 430 ferrite stainless steel is restrained to a certain extent, the corrosion rate is reduced and the corrosion process is accelerated and the corrosion rate is increased by increasing the corrosion rate in the co-existing solution of Cl ~ (2 +) and SO32 ~ (2 +).
【作者单位】：北京科技大学腐蚀与防护中心;吉林油田公司采油工艺研究院;
【基金】：国家科技基础性工作专项(2012FY113000) 国家自然科学基金(50901041) 国家科技支撑计划(2011BAK06B01-01)资助项目
【分类号】：TG142.71;TG172

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