Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (12): 2275-2281.doi: 10.3866/PKU.WHXB20081221

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Electrochemical Distribution Behavior of the Galvanic Corrosion of Brass-16Mn Steel Couple in Aqueous NaCl Solution

HUANGFu Shu-Jun, WANG Jia, HAN Xia, HU Jie-Zhen, ZHENG Ying-Ying   

  1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, Shandong Province, P. R. China; State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China; 3Shandong SERI Petrotech Development Co., Ltd, Dongying 257237, Shandong Province, P. R. China
  • Received:2008-07-23 Revised:2008-09-18 Published:2008-12-04
  • Contact: WANG Jia E-mail:jwang@ouc.edu.cn

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Abstract: A scanning microelectrode was used to measure the potential and current distributions on the metal surface of a brass-16Mn steel galvanic couple that was corroded in aqueous NaCl solutions with various concentrations. The potential and current distributions varied with the solution concentration and were also dependent on the distance from the brass-16Mn steel couple joint. These distributions were more symmetrical when the concentration of the solution was higher. The potential polarized greatly and the current density was larger near the couple joint. The potential and current distribution results were confirmed by surface observations of the corroded sample after the immersion test. Experimental results showed that corrosion was concentrated around the joint when solution concentration was low and was distributed more symmetrically as the solution concentration increased.

Key words: Brass, 16Mn steel, Micro-electrode, Galvanic corrosion, Potential distribution, Current distribution

MSC2000: 

  • O646