Alternating Current Corrosion Behavior of X80 Steel in 0.5 mol/L NaHCO3 Solution
摘 要
采用极化曲线、电化学阻抗谱(EIS)、金相显微镜等方法,研究了不同交流电流密度下X80钢在0.5 mol/L NaHCO3溶液中的腐蚀行为。结果表明,随着交流电流密度的升高,X80在NaHCO3中阳极区表现为不同程度的钝化特征,阴极区变化不大,阻抗谱均呈现高中频容抗弧和低频Warburg阻抗特征,反应过程主要受扩散控制;X80钢表面先发生点腐蚀,然后向均匀腐蚀发展,腐蚀产物含有铁的氧化物或铁、钙的碳酸盐等。
Abstract
The corrosion behavior of X80 steel in solution of 0.5 mol/L NaHCO3 with alternating current was investigated by polarization curves,electrochemical impedance spectroscopy (EIS),optical microscopy,etc. The results show that: as AC current density increased,the polarization curve of X80 in NaHCO3 solution presented alternating passivation characteristics at anode and little change at cathode,and the EIS showed a character of capacitive arc and Warburg impedance,implying a diffusion-controlled reaction process;X80 steel surface suffered pitting firstly and then expanded to an uniform corrosion,and its corrosion product was a mixture of iron oxides,iron or calcium carbonate,et al.
中图分类号 TG174.3 DOI 10.11973/fsyfh-201509011
所属栏目 试验研究
基金项目 中石油集团公司工程建设分公司项目(2011GJTC-01-03)
收稿日期 2014/8/28
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备注吴红梅,硕士在读,从事油田材料的腐蚀机理与防护技术研究。
引用该论文: WANG Xia,ZHANG Peng,WANG Fei,WU Hong-mei. Alternating Current Corrosion Behavior of X80 Steel in 0.5 mol/L NaHCO3 Solution[J]. Corrosion & Protection, 2015, 36(9): 846
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参考文献
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【4】李自力,丁清苗,张迎芳,等. 用电化学方法建立交流干扰下X70钢的最佳阴极保护电位[J]. 腐蚀与防护,2010,31(6):436-439.
【5】翁永基,王宁. 碳钢交流电腐蚀机理的探讨[J]. 中国腐蚀与防护学报,2011,31(4):270-274.
【6】姜子涛,杜艳霞,董亮,等. 交流电对Q235钢腐蚀电位的影响规律研究[J]. 金属学报,2011,47(8):997-1002.
【7】陈冬梅. X-65型钢管电化学氢渗透分析及其对应力腐蚀断裂的影响[J]. 舰船防化,2011(1):42-49.
【8】魏宝明. 金属腐蚀理论及应用[M]. 北京:化学工业出版社,2008:80-83.
【9】李谋成,林海潮,曹楚南. 碳钢在土壤中腐蚀的电化学阻抗谱特征[J]. 中国腐蚀与防护学报,2000,20(2):111-117.
【10】聂向晖,李晓刚,杜翠薇. Q235在不同含水量滨海盐土中腐蚀的电化学阻抗谱分析[J]. 材料工程,2009(6):15-19.
【11】王文杰,邱于兵,金名惠. X70钢在库尔勒土中腐蚀初期的电化学阻抗谱特征[J]. 材料保护,2007,40(12):18-21.
【12】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.
【13】HAMADOU L,KADRI A,BENBRAHIM N. Characterisation of passive films formed on low carbon steel in borate buffer solution by electrochemical impedance spectroscopy[J]. Applied Surface Science,2005,252(5):1510.
【14】GLASS G K,HASSANEIN A M,BUENFELD N R. Obtaining impedance information on the steel concrete interface[J]. Corrosion,1998,54:887.
【15】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,1986,26:781.
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