物理化学学报 >> 2001, Vol. 17 >> Issue (07): 651-654.doi: 10.3866/PKU.WHXB20010716

研究简报 上一篇    下一篇

因次分析法在电化学噪声分析中的应用

张昭;张鉴清;李劲风;王建明;曹楚南   

  1. 浙江大学化学系,杭州 310027; 2腐蚀与防护国家重点实验室,沈阳 110015;3福州大学材料学院,福州 350002
  • 收稿日期:2000-12-01 修回日期:2001-02-26 发布日期:2001-07-15
  • 通讯作者: 张鉴清 E-mail:cncao@sun.zju.edu.cn

Application of Dimension Analysis in Electrochemical Noise Technique

Zhang Zhao;Zhang Jian-Qing;Li Jin-Feng;Wang Jian-Ming;Cao Chu-Nan   

  1. Department of Chemistry, Zhejiang University, Hangzhou 310027; 2State Key La boratory for Corrosion and Protection,Shenyang 110015; 3Materials College, Fuz hou University,Fuzhou 350002
  • Received:2000-12-01 Revised:2001-02-26 Published:2001-07-15
  • Contact: Zhang Jian-Qing E-mail:cncao@sun.zju.edu.cn

摘要: 采用电化学噪声技术,研究了铝合金2024-T3在NaCl溶液中孔蚀过程的电化学噪声特 征.结果表明:电化学噪声的时域数据通过传统的FFT变换后得到的频域曲线SPD的特征参数(W 、、k和fc)均不能单独正确地刻画材料表面孔蚀的强度和趋势.基于因次分析法的基本原理 和对材料腐蚀过程影响因素的分析,从电化学噪声频域曲线SPD的特征参数出发,导出了能正 确表征材料表面孔蚀强度和趋势的两个参数SE和SG.其中,SE正比于孔蚀的强度IS,而SG的意 义仍在进一步的研究之中.

关键词: 因次分析法, 电化学噪声, FFT变换, 最大熵值法, 谱功率密度, 孔蚀

Abstract: Pitting corrosion of aluminum alloy 2024-T3 in NaCl solution was stud ied using electrochemical noise technique. The spectral analysis results showed that the more positive the values of cut-off frequency(fc), the slope of high- frequency linear part of SPD(k) and white noise level(W) are, the more easily th e pit initiates, but none of them can be used to depict the corrosion process in dividually. Two new parameters(SE and SG) were derived by using dimensional anal ysis method, and the value of SE characterize the severity of pitting of corrodi ng material. While the meaning of the other parameter(SG) remains for further in vestigation.

Key words: Dimension analysis, Electrochemical noise, Fast Fourier transform,  Maximum entropy method, Spectral power density, Pitting corrosion