Interpretation of electrochemical noise by wavelet transform and fractal analysis

被引：0
|
作者：
Jong Jip Kim
机构：
[1] Korea Research Institute of Standards and Science,
来源：
Metals and Materials International | 2011年 / 17卷
关键词：
metals; tempering; corrosion; tensile test; Hurst parameter;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Electrochemical noise(EN) was measured during pitting and stress corrosion tests in 3.5 % NaCl solutions for type 403 stainless steel tempered at 520 °C and 610 °C. The energy contributions of smooth crystal and detail crystals in three frequency divisions were analyzed after wavelet transform and compared with the change in the Hurst parameter based on the rescaled range analysis. The contribution of smooth crystal to the total energy is greater than that of low-frequency detail crystal in general corrosion and stable pit formation, but it is less in both meta-stable pitting and growth of stable pits. Crack growth rate can be estimated qualitatively by the evaluation of the energy contributions of smooth and detail crystals, and correlation was found between the change in the Hurst parameter and that in the energy contribution of smooth crystal or one of detail crystals in three frequency divisions.
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页码：777 / 782
页数：5
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