X65 MS耐酸管线钢在H<sub>2</sub>S环境中腐蚀产物膜的演变

doi:10.11902/1005.4537.2015.101

中国腐蚀与防护学报

2015, Vol. 35

Issue (5): 386-392 DOI: 10.11902/1005.4537.2015.101

本期目录 | 过刊浏览

X65 MS耐酸管线钢在H₂S环境中腐蚀产物膜的演变

董洋洋,黄峰(

),程攀,胡骞,刘静

Evolution of Corrosion Product Scales on an Acid Proof Pipeline Steel X65 MS in H₂S Containing Environment

Yangyang DONG,Feng HUANG(

),Pan CHENG,Qian HU,Jing LIU

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

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摘要:

采用场发射扫描电镜 (FE-SEM) 和X射线衍射 (XRD) 等表面测试技术,结合腐蚀失重法和电化学阻抗法对酸性环境用X65 MS管线钢在不同H₂S浓度和不同pH值的5%NaCl溶液中自然浸泡24 h后所形成的腐蚀产物膜的形貌、物相组成以及界面电化学性能进行了观察和分析,并对试样在其中的腐蚀规律进行了初步探讨。结果表明,在pH值相同时,X65 MS管线钢的平均腐蚀速率随H₂S浓度的增加而增大,在H₂S浓度相同且当浓度比[H₂S]/[H₃O⁺]<10^1.5时,腐蚀速率随着pH值的升高而降低,当[H₂S]/[H₃O⁺]>10^1.5时,腐蚀速率与pH值和H₂S浓度无关；在实验介质条件下形成的腐蚀产物膜主要是FeS的3种不同晶相,分别是非晶态FeS,晶态FeS和四方相FeS,且会随着pH值和H₂S浓度的不同而发生变化,此腐蚀产物膜对钢基体不具保护性。

关键词 ： X65 MS管线钢, H₂S浓度, pH值, 硫铁腐蚀产物膜

Abstract：

The corrosion behavior of X65 MS pipeline steel in 5%NaCl solutions with different concentrations of H₂S and pH values, and the morphology, composition and phase constituent of the corrosion product scales were investigated by means of mass-loss method, electrochemical impedance spectroscope, field emission scanning electron microscopy (FE-SEM) and X-ray diffractometer (XRD). The results showed that, in the solutions with the same pH value, the average corrosion rate of X65 MS pipeline steel increased with the increasing H₂S concentration. When the ratio [H₂S]/[H₃O⁺]<10^1.5, the average corrosion rate of the steel decreased with the increasing pH, on the contrast, which was independent to both of pH value and H₂S concentration if the ratio [H₂S]/[H₃O⁺]>10^1.5. Besides, the formed corrosion product scales on X65 MS pipeline steel were mainly composed of amorphous ferrous sulfide, iron sulfide and mackinawite, the amount of each phase varied with the pH value and H₂S concentration of the solutions. It is noted that all the corrosion product scales exhibited relatively poor protectiveness.

Key words： X65 MS pipeline steel H₂S pH corrosion product scale iron sulfides

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基金资助:国家自然科学基金项目 (51201119) 资助

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引用本文:

董洋洋, 黄峰, 程攀, 胡骞, 刘静. X65 MS耐酸管线钢在H₂S环境中腐蚀产物膜的演变[J]. 中国腐蚀与防护学报, 2015, 35(5): 386-392.
Yangyang DONG, Feng HUANG, Pan CHENG, Qian HU, Jing LIU. Evolution of Corrosion Product Scales on an Acid Proof Pipeline Steel X65 MS in H₂S Containing Environment. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 386-392.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.101 或 https://www.jcscp.org/CN/Y2015/V35/I5/386

图1 X65管线钢的显微组织像

图2 实验装置简图

图3 X65管线钢在不同H2S浓度和不同pH值下的平均失重腐蚀速率曲线

图4 在不同H2S浓度和不同pH值下所得到的腐蚀产物膜的SEM像

图5 在不同H2S浓度和不同pH值下所得到的腐蚀产物膜的XRD谱

图6 X65管线钢在不同pH值和不同H2S浓度下的EIS谱

表1 X65管线钢在不同pH值和不同H2S浓度下得到的EIS拟合结果

图7 等效电路图

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