MONITORING INITIAL PITTING CORROSION OF 45 STEEL IN NaHCO3-NaCl SOLUTION BY ESPI

J Chin Soc Corr Pro

2009, Vol. 29

Issue (3): 210-214 DOI:

技术报告

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MONITORING INITIAL PITTING CORROSION OF 45 STEEL IN NaHCO_3-NaCl SOLUTION BY ESPI

WANG Meifeng^1;2; DU Nan²; LI Xiaogang¹; ZHAO Qing²; LIU Gang²

1. Corrosion and Protection Center; University of Science and Technology Beijing; Beijing 100083
2. Key Laboratory of Nondestructive Testing (Nanchang Hangkong University); Ministry of Education; Nanchang 330063

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Abstract

ESPI were firstly used to monitor the real-time, in-situ　 corrosion behavior of 45 steel in　 0.5 mol/L NaHCO₃+0.05 mol/L NaCl solution during anodic polarization. By　 comparison between the ESPI image and the digital photo of the　 sample surface; it was found that at the same position where a　 speckle appeared, a pit appeared after the polarization experiment.　 It can be concluded that the bright speckles in the ESPI images were　 caused by the pitting corrosion products. Accordingly, the size,　 position and time of initial pitting corrosion could be deduced. The pitting potential (E_b) of 45 steel determined by the　method under the condition is -0.15 V;\linebreak meanwhile, the polarization current is 12.2 μA. Information of the pitting growth could be obtained by　 changes of the speckles in ESPI results.

Key words: pitting corrosion 45 steel NaHCO₃-NaCl ESPI

ZTFLH:

TG142

Fund:

江西省自然科学基金项目（CA200700132），江西省教育厅项目（DB200801230）

Corresponding Authors: LI Xiaogang E-mail: lixiaogang99@263.net

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Cite this article:

WANG Meifeng DU Nan LI Xiaogang ZHAO Qing LIU Gang. MONITORING INITIAL PITTING CORROSION OF 45 STEEL IN NaHCO_3-NaCl SOLUTION BY ESPI. J Chin Soc Corr Pro, 2009, 29(3): 210-214.

URL:

https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2009/V29/I3/210

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