| 因次分析法在电化学噪声分析中的应用 |
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| 引用本文： | 张昭,张鉴清,曹楚南,李劲风,王建明. 因次分析法在电化学噪声分析中的应用[J]. 物理化学学报, 2001, 17(7): 651-654. DOI: 10.3866/PKU.WHXB20010716 |
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| 作者姓名： | 张昭 张鉴清 曹楚南 李劲风 王建明 |
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| 作者单位： | Department of Chemistry, Zhejiang University, Hangzhou 310027;2.State Key La boratory for Corrosion and Protection,Shenyang 110015;3.Materials College, Fuz hou University,Fuzhou 350002 |
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| 基金项目： | 国家重点基础研究发展规划基金(G19990650)、国家自然科学基金(50071054)和金属腐蚀与防护国家重点实验室资助项目 |
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| 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.
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| 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 |
| 收稿时间： | 2000-12-01 |
| 修稿时间： | 2000-12-01 |
Application of Dimension Analysis in Electrochemical Noise Technique |
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| Zhang Zhao Zhang Jian-Qing, Li Jin-Feng Wang Jian-Ming Cao Chu-Nan. Application of Dimension Analysis in Electrochemical Noise Technique[J]. Acta Physico-Chimica Sinica, 2001, 17(7): 651-654. DOI: 10.3866/PKU.WHXB20010716 |
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| Authors: | Zhang Zhao Zhang Jian-Qing Li Jin-Feng Wang Jian-Ming Cao Chu-Nan |
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| Affiliation: | Department of Chemistry, Zhejiang University, Hangzhou 310027;2.State Key La boratory for Corrosion and Protection,Shenyang 110015;3.Materials College, Fuz hou University,Fuzhou 350002 |
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| Abstract: | Pitting corrosion of aluminum alloy 2024-T3 in NaCl solution was studied using electrochemical noise technique. The spectral analysis results showed that the more positive the values of cut-off frequency(f_c), the slope of high-frequency linear part of SPD(k) and white noise level(W) are, the more easily the pit initiates, but none of them can be used to depict the corrosion process individually. Two new parameters(S_E and S_G) were derived by using dimensional analysis method, and the value of S_E characterize the severity of pitting of corroding material. While the meaning of the other parameter(S_G) remains for further investigation. |
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| Keywords: | Dimension analysis Electrochemical noise Fast Fourier transform Maximum entropy method Spectral power density Pitting corrosion |
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