沉积硫对FeS及FeCO<sub>3</sub>膜结构及耐蚀性影响

doi:10.11902/1005.4537.2015.030

中国腐蚀与防护学报

2016, Vol. 36

Issue (1): 79-86 DOI: 10.11902/1005.4537.2015.030

本期目录 | 过刊浏览

沉积硫对FeS及FeCO₃膜结构及耐蚀性影响

沈秋燕,刘宏芳,刘烈炜(

)

华中科技大学化学与化工学院材料与环境化学研究所武汉 430074

Influence of Sulfur Deposition on Corrosion Behavior of Carbon Steel L360 Covered with FeS- or FeCO₃-film

Qiuyan SHEN,Hongfang LIU,Liewei LIU(

)

School of Chemistry and Chemical Engineering, Institute of Materials and Environmental Chemistry,Huazhong University of Science and Technology, Wuhan 430074, China

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摘要:

在常压,80 ℃条件下采用阳极电解NaHCO₃溶液制备FeCO₃膜,利用Na₂S在高温下水解生成H₂S及H₂S与碳钢反应生成FeS的方法制备FeS膜.采用静态失重,电化学阻抗谱,动电位极化和环境扫描电镜等技术研究膜的耐蚀性能及沉积硫下膜的破坏规律.结果表明,pH值为7和3的模拟溶液中,无硫粉存在时FeCO₃和FeS膜均具有较好的耐蚀性,且FeCO₃膜的耐蚀性最好;与中性条件相比,膜在酸性溶液中耐蚀性较差.沉积硫下膜的耐蚀性基本失效,且在pH值为7时预膜试片均发生局部腐蚀,其中FeCO₃膜下的局部腐蚀最严重且从边缘扩展,FeS膜下腐蚀则较均匀,而在pH值为3时试样均属于均匀腐蚀.

关键词 ： FeCO3膜, FeS膜, 耐蚀性, 硫沉积

Abstract：

A FeCO₃ film and FeS film were prepared on carbon steel L360 by anodic electrolyzing the steel in NaHCO₃ solution and immersing the steel in Na₂S solution respectively in air at 80 ℃. Then, the corrosion performance of the steel covered with the two films beneath sulfur-deposition in an artificial formation water was studied by means of electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and environmental scanning electron microscope (ESEM). The results indicated that for the case without S deposits, the two films showed good protectiveness in the artificial solutions with pH 7 and 3 respectively, and the FeCO₃ film was better than the FeS film. The two films were better in the neutral solution than in acidic solution. However, for the case with S deposits, the two films loosed their protectiveness in the two solutions. Moreover, in the solution with pH 7, the steel beneath FeCO₃ film suffered from local corrosion seriously, while the steel beneath FeS film suffered from uniform corrosion. Besides, in the solution with pH 3, the steels with or without films all suffered from uniform corrosion.

Key words： FeCO3 film FeS film corrosion resistance sulfur deposition

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引用本文:

沈秋燕,刘宏芳,刘烈炜. 沉积硫对FeS及FeCO₃膜结构及耐蚀性影响[J]. 中国腐蚀与防护学报, 2016, 36(1): 79-86.
Qiuyan SHEN, Hongfang LIU, Liewei LIU. Influence of Sulfur Deposition on Corrosion Behavior of Carbon Steel L360 Covered with FeS- or FeCO₃-film. Journal of Chinese Society for Corrosion and protection, 2016, 36(1): 79-86.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.030 或 https://www.jcscp.org/CN/Y2016/V36/I1/79

图1 L360碳钢试片在不同溶液中浸泡后所得膜的XRD和Raman谱

图2 膜的SEM像及EDS分析结果

表1 L360碳钢在模拟溶液中的腐蚀速率

图3 L360碳钢在模拟溶液中的EIS谱

图4 L360碳钢在模拟溶液中的电化学阻抗谱等效电路图

图5 L360碳钢在模拟溶液中的极化曲线

图6 模拟溶液中L360碳钢的拟后结果

图7 FeCO3膜试片沉积硫腐蚀截面形貌图

图8 L360碳钢硫沉积腐蚀形貌图

表2 L360碳钢在模拟溶液中的EIS谱拟合电化学参数Rct,Rf1及Rp的值

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