尿素对土壤中Q235钢腐蚀的影响

中国腐蚀与防护学报

2013, Vol. 33

Issue (3): 216-220

本期目录 | 过刊浏览

尿素对土壤中Q235钢腐蚀的影响

李喜明¹ 金哲² 刘五铸³ 孙成¹ 张洪伟² 许进¹ 闫茂成¹ 于长坤¹ 王振尧¹

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. 中国石油管道沈阳技术分公司沈阳 110031;
3. 中国石油天然气股份有限公司辽阳石化分公司机动设备处辽阳 111003

Effects of Urea on Corrosion Behavior of Q235 Steel in Soil

LI Ximing¹, JIN Zhe², LIU Wuzhu³, SUN Cheng¹, ZHANG Hongwei², XU Jin¹,
YAN Maocheng¹, YU Changkun¹, WANG Zhenyao¹

1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. Shenyang Technology Branch Office, PetroChina, Shengyang 110031, China;
3. Mobile Equipment Office, Liaoyang Petrochemical Company, PetroChina, Liaoyang 111003, China

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摘要: 利用电化学阻抗(EIS)和极化曲线等测试技术在湿度为30%的土壤中，研究了浓度为0.1%(质量分数)的氮肥尿素对碳钢腐蚀行为的影响。结果表明，实验初期尿素吸附在试样表面，阻抗谱呈现一个时间常数，且出现感抗。随着埋放时间的延长，尿素分解产生NH₃，土壤pH值减小。碳钢的自腐蚀电位随时间正移，腐蚀速率降低。后期阻抗谱上出现Warburg扩散，表明腐蚀过程受扩散控制。

关键词 ：碳钢, 尿素, 电化学阻抗(EIS)
中图分类号：TG172.4, 文献标识码：A, 文章编号：1005-4537(2013)03-0216-05

Abstract：The effect of urea (0.1%, mass fraction) on corrosion of Q235 steel in soil with humidity of 30% was investigated by electrochemical impendence spectroscopy (EIS) and polarization curve. At the initial experiment period, urea was adsorbed on the surface of carbon steel, and one time constant with an inductive reactance arc appeared in the EIS. Along with the time, urea was decomposed into ammonia, hence pH decreased. The potential of carbon steel increased and its corrosion rate decreased over experiment time. Warburg impedance was found at the later stage, which indicated that the process was controlled by concentration polarization.

Key words： carbon steel urea EIS

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引用本文:

李喜明金哲刘五铸孙成张洪伟许进闫茂成于长坤王振尧. 尿素对土壤中Q235钢腐蚀的影响[J]. 中国腐蚀与防护学报, 2013, 33(3): 216-220.
. Effects of Urea on Corrosion Behavior of Q235 Steel in Soil. Journal of Chinese Society for Corrosion and protection, 2013, 33(3): 216-220.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2013/V33/I3/216

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