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| ELECTROCHEMICAL NOISE ANALYSIS OF 304 STAINLESS STEEL PITTING CORROSION IN FERRIC CHLORIDE SOLUTION |
| LI Ji, ZHAO Lin, LI Bowen,ZHENG Liqun, HAN En-Hou |
| Environmental Corrosion Research Center,Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Abstract The localized corrosion behavior of 304 stainless steel immersed in 0.5 mol/L FeCl3 solution was investigated for a long-term monitoring as long as 350 h by electrochemical noise (EN) technique. The EN data was analyzed mainly by spectrum analysis, time-domain statistical analysis and wavelet transform. The whole process can be divided into four parts, which can be differentiated clearly according to the characteristic EN transient peaks. The variations of current standard deviation, Rn and PI during the whole monitoring period all give the coincident result. The 3D energy distribution plots(EDP) give the energy contribution of each detail crystals during the whole monitoring time. The figure which only concerns contribution of detail crystals shows that, the energy accumulation in band d4~d6 increases with the metastable pits occurrence. And as this process stepped into stable pitting stage, a max of the energy contribution occurs during the band d5~d8.
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Received: 22 May 2011
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Corresponding Authors:
ZHAO Lin
E-mail: zhaolin@imr.ac.cn
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