Electrochemical noises of LC4, LY12 and pure Al in NaCl solution
Cheng, YL; Cao, FH; Zhang, Z; Zhang, JQ; Wang, JM; Cao, CN
Corresponding AuthorCheng, YL()
AbstractElectrochemical noise (EN) test of aluminum alloys LC4, LY12 and pure aluminum in 2.0% (mass fraction) NaCl solution (pH=7.01) was reported. The potential fluctuation of the electrodes was recorded in time domain and simultaneously processed by fast Fourier transform method to gain spectra power dendsity (SPD) curves in frequency domain. It is found that EN characteristic varies with materials, that is, in time domain, pure aluminum and LC4 can stochastically exhibit sudden potential drop, which results in a sharp peak in potential-time curves, but LY12 does not. And the three features in SPD curve: W (white noise level), f(c) (cutoff frequency), and K (the slope of the high frequency domain), all change with the corrosion process and reach their extremum when pitting occurs. Any single parameter cannot correctly predict the strength and trend of pitting. However, two parameters S-E and S-G derived from the SPD curves can correctly predict whether pitting has occurred or not. That is, for different materials, pitting corrosion usually occurs when S-E >5 and S-G <1,
Keywordelectrochemical noise aluminum alloy pitting S-E S-G
Indexed BySCI
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000173742700014
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Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorCheng, YL
Affiliation1.Zhejiang Univ, Dept Chem, Hangzhou 310027, Peoples R China
2.Chinese Acad Sci, State Key Lab Corros & Protect Met, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Cheng, YL,Cao, FH,Zhang, Z,et al. Electrochemical noises of LC4, LY12 and pure Al in NaCl solution[J]. ACTA METALLURGICA SINICA,2002,38(1):74-78.
APA Cheng, YL,Cao, FH,Zhang, Z,Zhang, JQ,Wang, JM,&Cao, CN.(2002).Electrochemical noises of LC4, LY12 and pure Al in NaCl solution.ACTA METALLURGICA SINICA,38(1),74-78.
MLA Cheng, YL,et al."Electrochemical noises of LC4, LY12 and pure Al in NaCl solution".ACTA METALLURGICA SINICA 38.1(2002):74-78.
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