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首页> 外文期刊>International Journal of Electrochemical Science >Electrochemical Corrosion Behaviour of X70 Steel in Zinc (II)- Contaminated Sand Soil
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Electrochemical Corrosion Behaviour of X70 Steel in Zinc (II)- Contaminated Sand Soil

机译：X70钢在锌（II）污染的沙土中的电化学腐蚀行为

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As a common pipeline material, X70 steel has been extensively used in China (West-East Gas Pipeline Project), México and other countries. The macro-/micromorphology and surface composition of X70 steel in sand soil at exposure time of 35 d have been characterized using Canon 6D SLR cameras, SEM and EDS. To further study the effect of the heavy metal Zn (Ⅱ) on the corrosion performance of X70 steel in sand soil, electrochemical corrosion tests (exposure times of 7 d and 35 d), polarization curves and EIS measurements have been conducted utilizing an electrochemical workstation. Additionally, six sand soil samples with various contents of Zn (Ⅱ) were prefabricated. The results demonstrated that the addition of Zn (Ⅱ) in sand soil clearly accelerated the corrosion process and affected the corrosion performance of X70 steel in sand soil. In non-contaminated sand soil, the corrosion products of X70 steel were mainly composed of Fe2O3 and FeOOH etc… whereas the inner and outer layer iron- containing compounds constituted the corrosion products in Zn ( Ⅱ )-contaminated sand soil. Moreover, the addition of Zn (Ⅱ) in sand soil increased the degree of coverage and diversification of the corrosion products. The corrosion behaviour of X70 steel in non/low-contaminated sand soil (Czinc ( Ⅱ) ≤ 0.034%) exhibited localized corrosion, whereas in high-contaminated sand soil (Czinc (Ⅱ) = 0.068%- 0.680%), uneven general corrosion was confirmed. Furthermore, in contaminated sand soil, the corrosion degree of X70 was the most severe at a Zn (Ⅱ) content of 0.034%. A high content of Zn (Ⅱ ) (0.034%) accelerated the corrosion process. In addition, the Warburg impedance was observed in the EIS data of X70 steel in sand soil at exposure time of 35 d, and the reaction control step of the electrode reaction changed from activation control to diffusion control for X70 steel in Zn (Ⅱ)- contaminated sand soil.
机译：作为一种常见的管道材料，X70钢已在中国（西气东输工程），墨西哥和其他国家广泛使用。使用佳能6D单反相机，SEM和EDS表征了X70钢在暴露35 d时在沙土中的宏观/微观形貌和表面组成。为进一步研究重金属Zn（Ⅱ）对X70钢在砂土中腐蚀性能的影响，采用电化学工作站进行了电化学腐蚀试验（暴露时间分别为7 d和35 d），极化曲线和EIS测量。另外，还预制了六个含锌量不同的砂土样品。结果表明，砂土中Zn（Ⅱ）的添加明显促进了腐蚀过程，影响了X70钢在砂土中的腐蚀性能。在未污染的沙土中，X70钢的腐蚀产物主要由Fe2O3和FeOOH等组成，而内层和外层含铁化合物构成被Zn（Ⅱ）污染的沙土的腐蚀产物。此外，在沙土中添加Zn（Ⅱ）可增加腐蚀产物的覆盖度和多样性。 X70钢在无/低污染的沙土（Czinc（Ⅱ）≤0.034％）中的腐蚀行为表现出局部腐蚀，而在高污染的沙土中（Czinc（Ⅱ）= 0.068％-0.680％），一般腐蚀不均匀已经被证实。此外，在受污染的沙土中，Zn（Ⅱ）的含量为0.034％时，X70的腐蚀程度最严重。高含量的Zn（Ⅱ）（0.034％）加速了腐蚀过程。此外，在暴露时间为35 d的X70钢在沙土中的EIS数据中观察到Warburg阻抗，并且电极反应的反应控制步骤从X70钢在Zn（Ⅱ）-中的活化控制转变为扩散控制。受污染的沙土。

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