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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 3    June 2005

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Corrosion electrochemical behavior of brass tubes in circulating cooling seawater
LU Yu-zhuo(卢玉琢)1, SONG Shi-zhe(宋诗哲)1, 2, YIN Li-hui(尹立辉)1

1. School of Materials Science and Engineering, Tianjin University, 
Tianjin 300072, China; 
2. State Key Laboratory for Corrosion and Protection of Metals, 
Shenyang 110016, China

Abstract:Electrochemical impedance spectroscopy(EIS) and electrochemical noise(EN) were used to study the corrosion electrochemical behavior of brass tubes in circulating cooling seawater using the developed sensor. EIS study shows that the inhibitor can lead to the formation of corrosion products on metal surface, which will then inhibit the corrosion process. When the flow rate of the seawater increases, the diffusion of oxygen speeds up and the action of filming on HAl77-2 tube accelerates, resulting in decrease of corrosion rate. EN analysis shows that the flow rate of the seawater has little effect on pitting susceptivity of HSn70-1 tube; however the pitting susceptivity of HAl77-2 tube increases with increasing flow rate. Good agreement is observed between the spectral noise resistance Rsn(f) calculated from EN data and the modulus of impedance. It is shown that the electrochemical noise technique can be used in corrosion monitoring.

 

Key words: brass tube; seawater; electrochemical impedance spectroscopy; electrochemical noise

ISSN 1672-7029
CN 43-1423/U

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