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| ANALYSES OF SURFACE OXIDE FILMS ON GROUND ALLOY 690TT AFTER IMMERSION FOR DIFFERENT TIMES |
| ZHANG Zhiming, WANG Jianqiu, HAN En-Hou, KE Wei |
| State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Cite this article:
ZHANG Zhiming WANG Jianqiu HAN En-Hou KE Wei. ANALYSES OF SURFACE OXIDE FILMS ON GROUND ALLOY 690TT AFTER IMMERSION FOR DIFFERENT TIMES. Acta Metall Sin, 2011, 47(7): 823-830.
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Abstract The morphologies and structures of surface oxide films grown on ground Ni base alloy 690TT after immersion in the simulated hydrogenated primary water of pressured water reactors (PWRs) for different times were analyzed by various methods. After immersion for 35 h,\linebreak the ground alloy 690TT was covered with compact oxide particles. With the increase of the immersion time, the sample surfaces were covered with scattered big oxide particles and compact small oxide particles. Regardless of the immersion time, the grown oxide films are composed of spinel oxides and metallic Ni. After immersion for 720, 1440 and 2160 h, the oxide films are composed of three layers: the outmost layer is the separated big oxide particles which are rich in Fe and Ni; the intermediate layer is the compact small oxide particles rich in Cr, Fe and Ni; the inner layer is the continuous Cr oxides. The peak decompositions of the XPS results revealed that the Cr oxides in the inner layer are probably Cr2O3. The intermediate and inner layers in the oxide films could restrain the outward diffusion of metal atoms and also the inward diffusion of the oxygen atoms and then protect the matrix from further corrosion well. The average corrosion rate of the intermediate and inner layer decreased gradually with the immersion time increasing. Grinding treatment accelerated the growth of protective oxide film on alloy 690TT in the studied solution.
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Received: 06 April 2011
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| Fund: Supported by National Basic Research Program of China (No.2011CB610502) and National Natural Science Foundation of China (No.51025104) |
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