The electrochemical corrosion performance of thermally treated (TT) Alloy 690 (UNS N06690) was investigated in 200°C pressurized water before and after mechanical polishing/grinding. The surface analysis of the specimens was performed using atomic force microscopy, x-ray photoelectron spectroscopy, transmission electron microscopy coupled with energy dispersive spectroscopy, and focused ion beam microscopy. A Cr-rich outer layer formed during the TT process was detected at the surface of the as-received Alloy 690TT specimens. As a result of the greater formation of the Cr-based oxide film, the as-received specimen showed a more desirable corrosion behavior in both oxygenated and deoxygenated water environments. The near-surface microstructure of the as-received specimen was changed by mechanical polishing/grinding of the surface. The ground specimen showed a higher degree of deformation/dislocation than the polished specimen.
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1 December 2015
CORROSION SCIENCE SECTION|
November 01 2015
Electrochemical Corrosion Performance of Mechanically Polished Alloy 690TT at High-Temperature Water (200°C)
Farzin Arjmand;
Farzin Arjmand
*School of Mechanical Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, PR China.
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Lefu Zhang
Lefu Zhang
‡
*School of Mechanical Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, PR China.
‡Corresponding author: lfzhang@sjtu.edu.cn.
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CORROSION (2015) 71 (12): 1481–1489.
Article history
Received:
May 28 2015
Revision Received:
September 17 2015
Accepted:
September 18 2015
Citation
Farzin Arjmand, Lefu Zhang; Electrochemical Corrosion Performance of Mechanically Polished Alloy 690TT at High-Temperature Water (200°C). CORROSION 1 December 2015; 71 (12): 1481–1489. doi: https://doi.org/10.5006/1791
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