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化学学报
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化学学报 ›› 2008, Vol. 66 ›› Issue (10): 1151-1158. 上一篇    下一篇

研究论文

温度、pH值和氯离子对X80钢钝化膜内点缺陷扩散系数的影响

李党国*,1,2，冯耀荣2，白真权2，朱杰武1，郑茂盛1   

  1. (1西安交通大学材料科学与工程学院 西安 710049)
    (2中国石油天然气集团公司管材研究所 西安 710065)
  • 投稿日期:2007-11-09 修回日期:2007-12-18 发布日期:2008-05-28
  • 通讯作者: 李党国

Influences of Temperature, pH Value and Chloride Ion on the Diffusivity of Point Defect in the Passive Film on X80 Pipeline Steel

LI, Dang-Guo*,1,2, FENG, Yao-Rong2, BAI, Zhen-Quan2, ZHU, Jie-Wu1, ZHENG, Mao-Sheng1   

  1. (1 School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049)
    (2 Tubular Goods Research Center of China National Petroleum Corporation, Xi'an 710065)
  • Received:2007-11-09 Revised:2007-12-18 Published:2008-05-28
  • Contact: LI, Dang-Guo

PDF

867

被引次数

34 | 12

借助于Mott-Schottky和点缺陷模型(PDM)研究了溶液温度、pH值以及氯离子对X80管线钢在模拟土壤环境中所形成钝化膜内点缺陷扩散系数D0的影响. 结果表明: 随着溶液温度的升高、溶液pH值的降低以及氯离子浓度的增大, 钝化膜内的施主密度呈现增大的趋势. 依据点缺陷模型可以得到钝化膜内点缺陷(假设点缺陷为氧空位或铁离子间隙)的扩散系数D0达到10－16～10－17 cm2•S－1, 且D0随着溶液温度的升高、溶液pH值的降低及氯离子浓度的增加而增大.

关键词: 钝化膜, 点缺陷, 扩散系数D0, X80管线钢, Mott-Schottky分析

The influences of solution temperature, pH value and chloride ion concentration on the diffusivity of point defect (D0) in the passive film on X80 pipeline steel, were investigated by Mott-Schottky plot analysis and point defect model. The results showed that the donor density increased with increasing solution temperature, increasing chloride ion concentration and decreasing pH value. On the base of a point defect model (PDM), the diffusivity of point defect (assuming that the donors are oxygen vacancies and/or iron interstices) was calculated to be of 10－16～10－17cm2•S－1. D0 increases with increasing solution temperature, decreasing pH value and increasing chloride ion concentration.

Key words: passive film, point defect, diffusivity D0, X80 pipeline steel, Mott-Schottky analysis