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| Corrosion Behavior of High Performance Offshore Platform Steel with Chromium and Nickel Addition in the Environment Containing Chloride Ions |
| Yan-lei ZHOU,Xiang-jun ZHANG,Tao JIA,Zhen-yu LIU |
| State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract The characterization of corrosion products formed on a high performance offshore platform steel in the environment containing chloride ions has been investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), electron probe microanalysis (EPMA) and electrochemical impedance spectroscopy (EIS). The results reveal that the corrosion process can be divided into the initial stage and the later stage. The main constituents of rust layers are ��-FeOOH, ��-FeOOH, ��-FeOOH, Fe3O4 and large amounts of amorphous compounds. With increasing corrosion time, the mass fraction of ��-FeOOH and Fe3O4 increased, while that of ��-FeOOH and ��-FeOOH changed slightly. The enrichment of Cr and Ni at the inner/outer interface, especially the side of inner rust, can be observed in the later corrosion stage of Cr-Ni steel, which can promote the formation of compact inner rust layer, impeding the transmission of corrosion mediums and slowing down the electrochemical reaction process.
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Received: 12 May 2014
Published: 05 June 2015
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| Fund:High Technology Research and Development Program of China;Fundamental Research Funds for the Central Universities;Fundamental Research Funds for the Central Universities;A Project Supported by Scientific Research Fund of Liaoning Provincial Education Department |
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Corresponding Authors:
Yan-Lei ZHOU
E-mail: zhouyanlei84@163.com
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2015, Vol. 22 
