不同温度下X80钢在高pH土壤模拟溶液中的腐蚀电化学行为
Electrochemical Behavior of X80 Steel in Simulated Soil Solutions with High pH at Different Temperatures
摘 要
采用动电位极化、金相显微镜及电化学阻抗谱等方法研究了X80钢在不同温度(25 ℃, 45 ℃和65 ℃)的高pH土壤模拟溶液(0.5 mol·L-1 Na2CO3+1.0 mol·L-1NaHCO3)中的腐蚀电化学行为。动电位极化及金相显微镜结果表明, 随着温度的升高, X80钢腐蚀速率增加, 钝化膜耐蚀性降低, 且65℃时最为严重; 不同温度下钝化膜的电化学阻抗谱均呈现高、中频段容抗弧和低频段Warburg阻抗特征, 随着温度的升高, X80钢表面钝化膜致密性逐渐变差, 对基体的保护作用逐渐降低。
温度
动电位极化
钝化膜
电化学阻抗谱(EIS)
X80 steel
temperature
potentialdynamic polarization
passive film
electrochemical impedance spectroscopy(EIS)
Abstract
The electrochemical behavior of X80 steel in simulated soil solutions with hjgh pH (0.5 mol·L-1Na2CO3+1.0 mol·L-1NaHCO3) at different temperatures (25 ℃, 45 ℃and 65 ℃) was investigated by potentiodynamic polarization, metallurgical microscopy and electrochemiscal impedance spectroscopy(EIS).The results of potentiodynamic polarization and metallurgical microscopy showed that the corrosion resistance of the steel and its passive films were weakened gradually as the temperature increasesd, and the worst condition was at 65 ℃. All electrochemical impedance spectroscopy(EIS) of passive films at different temperatures showed the characters of double capacitive arcs and Warburg impedance. As the temperature increased, the compactness of passive films on X80 steel surface became worse and thus the protection of passive film for X80 was weakened gradually.
中图分类号 TG174
所属栏目 试验研究
基金项目 国家自然科学基金(51174171)
收稿日期 2012/6/16
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备注王霞, 教授, 博士,
引用该论文: WANG Xia,WANG Fei,ZHANG Peng. Electrochemical Behavior of X80 Steel in Simulated Soil Solutions with High pH at Different Temperatures[J]. Corrosion & Protection, 2013, 34(4): 287
被引情况:
【1】滕飞,胡钢, "几种气相缓蚀剂对铸铁材料的缓蚀行为",腐蚀与防护 35, 785-788(2014)
【2】谢飞,杨晓峰,王丹,王永彪,齐季,丰华岐, "库尔勒土壤模拟溶液的pH对X80管线钢电化学腐蚀行为的影响",机械工程材料 39, 59-62(2015)
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【2】孙成, 韩恩厚, 李洪锡, 等.原位测试研究土壤环境因素对碳钢的腐蚀影响[J].中国腐蚀与防护学报, 2002, 22(4):207-210.
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【4】曹君飞, 陈普信, 徐克, 等.温度对不同含水率土壤中碳钢腐蚀行为的影响[J].材料保护, 2008, 41(3):11-14.
【5】张国良, 李光福, 周建江, 等.电极电位和温度对X70钢在高pH值模拟土壤环境中应力腐蚀破裂的影响[J].腐蚀与防护, 2007, 28(9):437-441.
【6】黄峰, 曲炎淼, 邓照军, 等.不同组织X80钢在高pH值土壤模拟溶液中的点蚀电化学行为[J].中国腐蚀与防护学报, 2010, 30(1):29-34.
【7】曹楚南.腐蚀电化学原理[M].北京:化学工业出版社, 2002.
【8】费小丹, 李明齐, 许红梅, 等.湿度对X70钢在卵石黄泥土中腐蚀行为影响的电化学研究[J].腐蚀科学与防护技术, 2007, 19(1):35-39.
【9】Xu C M, Zhang Y H, Cheng G X, et al. Pitting corrosion behavior of 316L stainless steel in the media of sulphate-reducing and iron-oxidizing bacteria [J].Materials Characterization, 2008, 59(3):245-250.
【10】Glass G K, Hassanein A M, Buenfeld N R. Obtaining impedance information on the steel-concrete interface [J].Corrosion, 1998, 54(11):887-897.
【11】Castro E B, Valentini C R, Moina C A, et al. The influence of ionic composition on the electrodissolution and passivation of iron electrodes in potassium carbonate-bicarbonate solutions in the 8.4~10.5 pH range at 25 ℃[J].Corrosion Science, 1986, 26(7):781-789.
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