模拟工业-海岸大气中SO2对Q235B钢腐蚀行为的影响

金属学报, 2014, 50(7): 802-810. doi: 10.3724/SP.J.1037.2013.00738

模拟工业-海岸大气中SO2对Q235B钢腐蚀行为的影响

陈文娟 ^1, , 郝龙 ^2, , 董俊华 ^3, , 柯伟 ^4, , 文怀梁 ^5,

1.中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016

2.中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016

3.中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016

4.中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016

5.中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016

关键词： Q235B钢 , 干/湿交替 , 工业-海岸大气腐蚀 , 锈层

EFFECT OF SO2 ON CORROSION EVOLUTION OF Q235B STEEL IN SIMULATED COASTAL-INDUSTRIAL ATMOSPHERE

Keywords： Q235B steel , dry/wet cyclic , coastal-industrial atmospheric corrosion , rust

采用循环干/湿模拟腐蚀增重实验、动电位极化曲线、电化学阻抗谱和XRD方法,研究了模拟海岸-工业大气中SO2对Q235B钢腐蚀行为的影响.结果表明,在腐蚀初期SO2抑制了Q235B钢的腐蚀;在腐蚀后期,SO2促进了Q235B钢的腐蚀.当SO2的浓度较低时,腐蚀速率随SO2浓度的升高而增大;当SO2的浓度较高时,腐蚀速率随SO2浓度的升高而减小.工业-海岸大气中的SO2组分可以抑制腐蚀产物中γ-FeOOH和ββ-FeOOH的生成,而促进α-FeOOH生成.低碳钢腐蚀速率随SO2浓度变化出现的极值现象与SO2导致的锈层相组分变化密切相关.

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模拟工业-海岸大气中SO2对Q235B钢腐蚀行为的影响

EFFECT OF SO2 ON CORROSION EVOLUTION OF Q235B STEEL IN SIMULATED COASTAL-INDUSTRIAL ATMOSPHERE

参考文献