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中国腐蚀与防护学报  2015, Vol. 35 Issue (3): 227-232    DOI: 10.11902/1005.4537.2014.089
  本期目录 | 过刊浏览 |
温度对X80管线钢酸性红壤腐蚀行为的影响
杨霜1,2,唐囡3,闫茂成1(),赵康文2,孙成1,许进1,于长坤1
2. 沈阳理工大学环境与化学工程学院 沈阳 110016
3. 国网江西省电力科学研究院 南昌 330096
Effect of Temperature on Corrosion Behavior of X80 Pipeline Steel in Acidic Soil
Shuang YANG1,2,Nan TANG3,Maocheng YAN1(),Kangwen ZHAO2,Cheng SUN1,Jin XU1,Changkun YU1
1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. College of Environment and Chemical Engineering, Shenyang Ligong University, Shenyang 110016, China
3. Electric Power Research Institute of Jiangxi Province, State Grid Corporation, Nanchang 330096, China
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摘要: 

使用电化学阻抗谱 (EIS) 研究X80管线钢在不同温度酸性红壤中的腐蚀行为,应用动力学和过渡态理论分析X80管线钢腐蚀过程的反应动力学特征。结果表明,X80钢在红壤中的EIS由高频区的土壤容抗弧和低频区的界面过程容抗弧组成。环境温度对X80钢红壤腐蚀影响显著：随温度的升高,土壤电阻和电荷转移电阻均呈减小趋势,腐蚀速率增大。反应动力学分析表明,X80钢在酸性红壤中的腐蚀是体系混乱度减小的吸热反应。
关键词 ： 管线钢,  阴极保护,  酸性土壤,  EIS,  动力学分析    
Abstract：

Corrosion of X80 pipeline steel in an acidic red soil collected from Yingtan area of Southeast China was studied in a temperature range 20~75 ℃ by electrochemical impedance spectroscopy (EIS). Theory concerning corrosion dynamics and transition state was applied to analyze the process and kinetics of the corrosion reaction. The results show that EIS of X80 steel in the red soil contains a capacitive arc related with soil at the high frequency region and a capacitive arc from the interface process at low frequency region. With increasing temperature, the soil resistivity and charge transfer resistance decrease, and the corrosion rate increases. Kinetics analysis shows that corrosion of X80 steel in the acidic red soil is an endothermic reaction system companied with decrease of disorder degree.
Key words： pipeline steel    cathodic protection    acidic soil    EIS    kinetic analysis
    
基金资助:国家自然科学基金重点项目(51131001),国家电网科技项目 (521820130014)和教育部留学回国人员科研启动基金项目资助
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引用本文:

杨霜,唐囡,闫茂成,赵康文,孙成,许进,于长坤. 温度对X80管线钢酸性红壤腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2015, 35(3): 227-232.
Shuang YANG, Nan TANG, Maocheng YAN, Kangwen ZHAO, Cheng SUN, Jin XU, Changkun YU. Effect of Temperature on Corrosion Behavior of X80 Pipeline Steel in Acidic Soil. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 227-232.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.089      或      https://www.jcscp.org/CN/Y2015/V35/I3/227

图1  X80钢在各温度下酸性红壤中的EIS谱
图2  X80钢在红壤腐蚀过程中的EIS等效电路
图3  由图2中等效电路对X80钢EIS谱进行拟合的结果
Temperature ℃ Rs kΩcm2 Y0,s Scm-2s-n n1 Rct kΩcm2 Y0,dl Scm-2s-n n2
20 6.072 7.89×10-11 1 6.556 1.71×10-4 0.701
30 4.394 7.55×10-11 1 3.468 1.65×10-4 0.836
40 3.388 4.36×10-10 0.869 1.758 1.86×10-4 0.765
50 3.051 1.58×10-9 0.762 1.312 1.83×10-4 0.793
65 2.641 1.79×10-9 0.760 0.675 1.91×10-4 0.787
70 2.397 2.10×10-9 0.754 0.606 2.45×10-4 0.642
75 2.334 2.66×10-10 0.913 0.493 1.90×10-4 0.744
表1  EIS拟合得到的电化学参数
图4  电化学阻抗谱参数Rs与Rct随温度的变化
T / ℃ Ea kJmol-1 ΔG0 kJmol-1 ΔHa0 kJmol-1 ΔSa0 kJmol-1
20 38.95 65.45 36.52 ?0.0988
30 38.95 66.00 36.43 ?0.0976
40 38.95 66.32 36.35 ?0.0958
50 38.95 67.57 36.27 ?0.0969
65 38.95 68.71 36.14 ?0.0964
70 38.95 69.38 36.10 ?0.0970
75 38.95 69.75 36.06 ?0.0968
表2  X80钢红壤腐蚀过程中的反应活化能、活化自由能、活化焓及活化熵
图5  温度对腐蚀速率的影响及拟合Arrhenius曲线
图6  (Rct-1/T) 与1/ T的关系及过渡态曲线拟合结果
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