欢迎访问《电化学(中英文)》期刊官方网站,今天是
研究论文

铬对碳钢在NaHCO_3/NaCO_3缓冲溶液中所成钝化膜半导体性能的影响

  • 李金波 ,
  • 朱杰武 ,
  • 郑茂盛
展开
  • 西北大学凝聚态物理与材料研究所,西北大学凝聚态物理与材料研究所,西北大学凝聚态物理与材料研究所 陕西西安710049,西安交通大学材料科学与工程学院,陕西西安710065,陕西西安710049,陕西西安710049

收稿日期: 2007-08-28

  修回日期: 2007-08-28

  网络出版日期: 2007-08-28

Influence of Chromium on the Semi-Conductive Property of Passive Film Formed on Carbon Steel in Bicarbonate/Carbonate Buffer Solution

  • LI Jin-bo ,
  • ZHU Jie-wu ,
  • ZHENG Mao-sheng
Expand
  • (1.Insitute of Condensed Physics and Materials,Northwest University,Xi'an 710069,China,2.School of Material Science and technology of Xi'an Jiaotong University,Xi'an 710049,China

Received date: 2007-08-28

  Revised date: 2007-08-28

  Online published: 2007-08-28

摘要

应用电化学阻抗谱技术研究铬对碳钢钝化膜半导体性能的影响.实验表明,在碳酸氢钠/碳酸钠缓冲溶液中碳钢形成的钝化膜具n型半导体特性,而含有3%铬的碳钢钝化膜则呈n-p型半导体特性,随着成膜电位的增加,以上两种钝化膜之Mott-Schottky直线部分的斜率均呈增大的趋势,表明成膜电位升高,膜内的杂质密度减小,但铬的加入使得碳钢钝化膜的施主密度增加约一个数量级,从而增加了碳钢点蚀发生的趋势.EIS分析表明:铬的加入降低了钝化膜的传递电阻R1和膜电阻R2,特别是膜电阻R2下降达3个数量级,这就有可能增加碳钢在高pH值环境中的腐蚀.

本文引用格式

李金波 , 朱杰武 , 郑茂盛 . 铬对碳钢在NaHCO_3/NaCO_3缓冲溶液中所成钝化膜半导体性能的影响[J]. 电化学, 2007 , 13(3) : 274 -278 . DOI: 10.61558/2993-074X.1821

Abstract

The influence of chromium on the semi-conductive property of the passive film formed at carbon steel in bicarbonate/carbonate buffer solution,is investigated by using electrochemical impedance spectroscopy(EIS).The results showed that the passive film fomed at carbon steel appeared an n-type semi-conductive property,but if the passive film formed at carbon steel with 3% chromium content exhibited an a-p semi-conductive charatcer.The slopes of Mott-Schottky plot of two passive films increased with rising the formation potential,it indicating the defect density of the film decreasing,but for the passive film formed at carbon steel with chromium additive,its donor density was lower about one order of magnitude than that of passive film formed at carbon steel,this showed that the addition of chromium can increase the occurrence of the pitting corrosion.EIS experimental results raveled chromium increased the values of transfer impedance R1 and film impedance R2.Especially,the film impedance R2 was lower about three order magnitudes than that of carbon steel,it illustrated that the addition of chromium may increase the corrosion occurrence in the environment with high pH value.

参考文献

[1]Moraes F D de,Shadley J R,Chen J F,et al.Charac-terization of CO2corrosion product scales related to En-vironmental Conditions[C].Corrosion 2000. [2]ZHENG Jiashen(郑家燊).Fault-block oil&gas field(in Chinese),1996,3(1):62. [3]ZGANG Xueyuan(张学元).Oilfield Chemistry,1997,14(2):190. [4]Bai Zhenquan,Chen Changfeng,Lu Minxu,et al.A-nalysis of EIS charateristics of CO2corrosion of well tubesteels with corrosion scale[J].Applied Surface Sci-ence,2006,252:7578. [5]Sikora J,Sikora E,Macdonald D D.[J].Electrochim-ca Acta,2000,45:1875. [6]Stimming U,in:M.Froment(Ed.),Passivity of Metalsand Semiconductors,Elsevier,Amsterdam,1983,P.477. [7]MacDougall B R,Graham M J,in:Marcus P,Oudar J(Eds.),Corrosion Mechanism in Theory and Practice,Marcel Dekker,New York,1995. [8]Macdonald D D.The point defect model[J].J Electro-chem Soc,1992,139:3434.
文章导航

/