Effect of Chloride on electrochemical corrosion behavior of 300M ultra high strength steel

doi:10.11890/1006-7191-104-301

Acta Metallurgica Sinica (English Letters) ›› 2010, Vol. 23 ›› Issue (4): 301-311.DOI: 10.11890/1006-7191-104-301

Effect of Chloride on electrochemical corrosion behavior of 300M ultra high strength steel

孙敏¹,董超芳²,肖葵 ³,李晓刚³

1. 北京科技大学材料科学与工程学院
2. 北京科技大学腐蚀与防护中心
3. 北京科技大学

收稿日期:2010-02-26 修回日期:2010-04-23 出版日期:2010-08-25 发布日期:2010-08-11
通讯作者: 孙敏

Electrochemical corrosion behavior of 300M ultra high strength steel in chloride containing environment

Min SUN, Kui XIAO, Chaofang DONG, Xiaogang LI

Corrosion and Protection Center, School of Material and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received:2010-02-26 Revised:2010-04-23 Online:2010-08-25 Published:2010-08-11
Contact: Xiaogang LI

摘要/Abstract

关键词: 300M steel, electrochemical corrosion, chloride

Abstract:

The electrochemical corrosion behavior of 300M ultra high strength steel in chloride containing environment was investigated by potentiodynamic polarization technique, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The results show that uniform corrosion occurs on 300M steel during the electrochemical measurements because no anodic passivation phenomenon is observed on polarization curves within the measurement range. The tests also show that 300M steel is highly susceptible to chloride containing solution, which is characterized by corrosion current density increasing with the addition of chlorides, and corrosion potential shifting towards positive direction and corrosion resistance decreasing, positively suggesting that chloride ions speed up the corrosion rate of 300M steel. Meanwhile corrosion products on the 300M steel surface formed during the salt spray test are too loose and porous to effectively slow down the corrosion rate. Additionally, a schematic structure of uniform corrosion mechanism can explain that 300M steel has better property of stress corrosion cracking (SCC) resistance than stainless steels.

Key words: 300M ultra high strength steel, Electrochemical corrosion, Chloride

孙敏董超芳肖葵李晓刚. Effect of Chloride on electrochemical corrosion behavior of 300M ultra high strength steel[J]. Acta Metallurgica Sinica (English Letters), 2010, 23(4): 301-311.

Min SUN, Kui XIAO, Chaofang DONG, Xiaogang LI. Electrochemical corrosion behavior of 300M ultra high strength steel in chloride containing environment[J]. Acta Metallurgica Sinica (English Letters), 2010, 23(4): 301-311.

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Effect of Chloride on electrochemical corrosion behavior of 300M ultra high strength steel

Electrochemical corrosion behavior of 300M ultra high strength steel in chloride containing environment

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