|
|
ANALYSES OF SURFACE OXIDE FILMS ON ELECTROPOLISHED 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 |
|
Cite this article:
ZHANG Zhiming WANG Jianqiu HAN En-Hou KE Wei. ANALYSES OF SURFACE OXIDE FILMS ON ELECTROPOLISHED ALLOY 690TT AFTER IMMERSION FOR DIFFERENT TIMES. Acta Metall Sin, 2011, 47(7): 831-838.
|
Abstract The corrosion of Ni base alloys in high temperature and high pressure water is affected by samples surface statuses. The morphologies and structures of surface oxide films grown on electropolished (EP) alloy 690TT after immersion in the simulated hydrogenated primary water of pressured water reactors (PWRs) for different times were analyzed by AFM, SEM, TEM, EDS and XPS. After immersion for 15 and 35 h, the EP alloy 690TT samples were covered with columnar oxides. With the increase of the immersion time, the sample surfaces were covered with scattered big oxide particles and loose needle-like oxides. Regardless of the immersion time, the formed 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 loose needle--like oxides rich in Ni; the inner layer is the continuous and compact Cr oxides. The peak decomposition of the XPS revealed that the Cr oxides in the inner layer are probably Cr2O3. Only the inner layer in the oxide film could restrain the outward diffusion of metal atoms and also the inward diffusion of the oxygen atoms and then played the role of barrier layer well. Electropolishing treatment disadvantaged the fast growth of protective oxide film on alloy 690TT in the studied solution. The average corrosion rate of the inner layer does not decrease gradually with increasing the immersion time. After immersion for 2160 h, the oxide film still could not protect the matrix from further corrosion.
|
Received: 12 May 2011
|
Fund: Supported by National Basic Research Program of China (No.2011CB610502) and National Natural Science Foundation of China (No. 51025104) |
[1] Chinese Academic of Engineering. Study of the National Development Strategy on Medium– and Long–Term Program for Energy: Electrical Power, Oil and Gas, Nuclear Power and Environment. Beijing: Science Press, 2011: 218(中国工程院. 中国能源中长期(2030, 2050)发展战略研究: 电力?油气?核能?环境卷. 北京: 科学出版社, 2011: 218)[2] Staehle R W. International Seminar on Materials Problems in Light Water Nuclear Power Plants: Status, Mitigation, Future Problems, Suzhou: Institute of Metal Research, Chinese Academy of Sciences, Suzhou Nuclear Power Research Institute, the Second Research and Design Institute of Nuclear Industry, Feb 20–23, 2005[3] Sun H. PhD Thesis, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 2010(孙华. 中国科学院金属研究所博士学位论文, 沈阳, 2010)[4] Staehle R W, Gorman J A. Corrosion, 2003; 59: 931[5] Han E H, Wang J Q, Wu X Q, Ke W. Acta Metall Sin, 2010; 46: 1379(韩恩厚, 王俭秋, 吴欣强, 柯 伟. 金属学报, 2010; 46: 1379)[6] Lee S J, Lai J J. J Mater Process Technol, 2003; 140: 206[7] Ziemniak S E, Hanson M, Sander P C. Corros Sci, 2008; 50: 2465[8] Robertson J. Corros Sci, 1991; 32: 443[9] Ding X S. Nucl Power Eng Technol, 2000; 13(4): 37(丁训慎. 核电工程与技术, 2000; 13(4): 37)[10] Terachi T, Totsuka N, Yamada T, Nakagawa T, Deguchi H, Horiuchi M, Oshitani M. J Nucl Sci Technol, 2003; 40: 509[11] Ziemniak S E, Hanson M. Corros Sci, 2006; 48: 498[12] Ziemniak S E, Hanson M. Corros Sci, 2002; 44: 2209[13] Zhang Z M, Wang J Q, Han E H, Ke W. Acta Metall Sin, 2011; 47: 823(张志明, 王俭秋, 韩恩厚, 柯伟. 金属学报, 2011; 47: 823)[14] Hermas A A. Corros Sci, 2008; 50: 2498[15] Stefanov P, Stoychev D, Stoycheva M, Marinova T. Mater Chem Phys, 2000; 65: 212[16] Sun H, Wu X Q, Han E H. Corros Sci, 2009; 51: 2840[17] McIntype N S, Rummery T E, Cook M G, Owen D. J Electrochem Soc, 1976; 123: 1164[18] Machet A, Galtayries A, Zanna S, Klein L, Maurice V, Jolivet P, Foucault M, Combrade P, Scott P, Marcus P. Electrochim Acta, 2004; 49: 3957[19] McIntype N S, Zetaruk D G, Owen D. J Electrochem Soc, 1979; 126: 750[20] Carette F, Lafont M C, Chatainier G, Guinard L, Pieraggi B. Surf Interface Anal, 2002; 34: 135[21] Machet A, Galtayries A, Marcus P, Combrade P, Jolivet P, Scott P. Surf Interface Anal, 2002; 34: 197[22] Sun M C, Wu X Q, Zhang Z E, Han E H. J Supercrit Fluids, 2008; 47: 309[23] Panter J, Viguier B, Clou´e J M, Foucault M, Combrade P, Andrieu E. J Nucl Mater, 2006; 348: 213[24] Zhang Z M, Wang J Q, Han E H, Ke W. Corros Sci, 2011, submitted[25] Zhang Z M, Wang J Q, Han E H, Ke W. Corros Sci, 2011, accepted[26] Li M S. High Temperature Corrosion of Metals. Beijing: Metallurgical Industry Press, 2001: 162(李美栓. 金属的高温腐蚀. 北京: 机械工业出版社, 2001: 162)[27] Marchetti L, Perrin S, Raquet O, Pijolat M. Mater Sci Forum, 2008; 595–598: 529[28] Lister D H, Davidson R D, Mcalpine E. Corros Sci, 1987; 27: 113[29] Zhang Z M, Wang J Q, Han E H, Ke W. J Mater Sci Technol, 2011, accepted |
No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
|
Shared |
|
|
|
|
|
Discussed |
|
|
|
|