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The characteristics of development of the carbon steel passivation membrane during the pitting corrosion process

Y. L. ZHU1,2,* , J. H. WANG1, J. Y. ZHAO2

Affiliation

  1. School of Materials Science and engineering Tianjin university China 30072
  2. Jiangsu Key Laboratory for Clad Materials , Wuxi Yinbang clad Material Co., Ltd, China, 214000

Abstract

The passivity and pitting behavior of Q235 carbon steel in the 0.5M NaHCO 3 solution with different concentrations of Cl were studied by electrochemical measurements. The polarization curves show that the anti corrosion capability of the carbon steel decreased with the increase of the chloride ion concentration whether the mater ial was immersed in the 0.5M NaHCO 3 for pre treatment before testing or not. The electrochemical noise method (EN) was applied in the experiment to record the fluctuation signal of current and potential. The pitting corrosion process of carbon steel was di stinguished into three stages: metastable state, intermediate state and stable state through k means cluster of EN. Most parameters of Noise resistance R n , frequency F n , current wavelet dimension W i were developed to characterize the three stages of pittin g process. The clustering method was confirmed correct by the metallographic images of the three stages..

Keywords

Carbon steel , Pitting Electrochemical noise, Cluster , Wavelet.

Submitted at: April 27, 2015
Accepted at: June 24, 2015

Citation

Y. L. ZHU, J. H. WANG, J. Y. ZHAO, The characteristics of development of the carbon steel passivation membrane during the pitting corrosion process, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 7-8, pp. 930-937 (2015)