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| Microstructure Characteristic and Electrochemical Corrosion Behavior of Surface Nano-crystallization Modified Carbon Steel |
| Zhao-jun CHENG1,Dan SONG1,2,3,Jin-yang JIANG2,Jing-hua JIANG1,Xiao-long MA4,Kai YOU1,Ai-bin MA1,3 |
1. College of Mechanics and Materials, Hohai University, Nanjing 210098, Jiangsu, China
2. School of Materials Science and Engineering, Southeast University, Nanjing 211100, Jiangsu, China
3. Suqian Research Institute of Hohai University, Suqian 223800, Jiangsu, China
4. Department of Material Science and Engineering, North Carolina State University, Raleigh 27606, US |
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Abstract The surface nano-crystallization (SNC) of carbon steel was achieved via a high-speed rotating wire-brushing process. Microstructure characteristics of SNC steel were systematically studied. The SNC steel surface exhibited marked deformed plastic flows and high surface roughness. Due to the accumulated strains, a deformed gradient layer with thickness of 40-50 ��m was produced, and the grain size of the topmost zone was about 50-100 nm. X-ray photoelectron spectroscopy (XPS) analysis indicated that enhanced Fe oxides and Cr oxides were generated. Electrochemical corrosion tests, including open circuit potential (OCP), electrochemical impendence spectroscopy (EIS), potentiodynamic polarization (PDP) and potentiostatic polarization (PP) were conducted to study the corrosion behavior of SNC steel in 3.5 mass% NaCl solution, where an improved corrosion resistance was observed. The resulted improvement resulted from the dominated positive effects (the attached Cr alloying element and enhanced oxide film) against the negative effects (the higher roughness and the improved corrosion activity of surface microstructure).
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Received: 27 April 2016
Published: 15 December 2016
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| Fund:National Basic Research Program of China;Natural Science Foundation of China;Natural Science Foundation of Jiangsu Province of China;Joint innovation fund project of Jiangsu province of China;��Six talent Peak�� Project of Jiangsu Province;Fundamental Research Funds for The Central Universities;Research innovation project of college graduates of Jiangsu Province;Practice innovation project of college graduates of Jiangsu Province |
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Corresponding Authors:
Jinghua jiang
E-mail: jinhua-jiang@hhu.edu.cn
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2016, Vol. 23 
