Acta Metall Sin  2012, Vol. 48 Issue (8): 957-964    DOI: 10.3724/SP.J.1037.2012.00298

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MICROSTRUCTURE AND HIGH TEMPERATURE OXIDATION RESISTANCE OF NANOCRYSTALLINE Ni–CeO2 COMPOSITE COATINGS DEPOSITED BY DOUBLE–PULSED ELECTRO DEPOSITION

ZHOU Xiaowei, SHEN Yifu, GU Dongdong

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016

ZHOU Xiaowei SHEN Yifu GU Dongdong. MICROSTRUCTURE AND HIGH TEMPERATURE OXIDATION RESISTANCE OF NANOCRYSTALLINE Ni–CeO₂ COMPOSITE COATINGS DEPOSITED BY DOUBLE–PULSED ELECTRO DEPOSITION. Acta Metall Sin, 2012, 48(8): 957-964.

Abstract References Related Articles Recommended Metrics Download:  PDF(2750KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Ni–CeO2 nanocomposite coatings were successfully electrodeposited from a standard Watts–nickel solution by a pulsed current (PC) method under ultrasonic field (UF). The surface morphology, microstructural evolution and phase composition of both pure Ni and Ni–CeO2 coatings were characterized using E–SEM, TEM and XRD, respectively. The curves of oxidation kinetics and DSC analysis were employed to evaluate high temperature oxidation resistance and thermal stability of these coatings. The experimental results indicate that the effect of acoustic streaming produced by ultrasonic field can effectively promote the uniform distribution of CeO2 nanoparticles in electrolyte. The adding of 20 g/L CeO2 can make the Ni grains refined in the Ni–CeO2 coating. During annealing at 873 K for 2 h, a sort of precipitated phase named NiCe2O4 is formed along the edge of crack propagation in this coating to bond or heal up the existing grain–boundaries, and to make them far from the initiation and extension of thermal cracks. A large volume fraction of grain–boundaries act as diffusion channels to make NiCe2O4 precipitated and form a continuous and compact layer enriched with Ce alloying element leading to inhibition of mutual diffusion between O and Ni atoms in this layer and reduction of the oxidation rate. According to different endothermic peaks of DSC curves, the activation energy of crystallization calculated by Kissinger equation displays the better thermal stability of 243.3 kJ/mol for Ni grains in the Ni–CeO2 coating than 159.2 kJ/mol for pure Ni coating, and the corresponding endothermic peak is about 130 K higher than that of the latter. Key words:  thermal stability      high temperature oxidation resistance      double–pulsed electro deposition      activation energy       Ni–CeO2      Received:  24 May 2012      ZTFLH:  TG172.5     TG153.1   Fund:  Supported by Funding of Jiangsu Innovation Program for Graduate Education (No.CXLX12–0151) Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors ZHOU Xiao-Wei URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00298     OR     https://www.ams.org.cn/EN/Y2012/V48/I8/957 [1] Li L, Huang S G, Xu L P, Biest O V D, Vleugels J. J Mater Sci Technol, 2001; 17: 529 [2] Abbas M I, Ibrahim K, Wu Z Y, Zhang J, Liu F Q, Qian H J. Acta Metall Sin (Engl Lett), 2001; 14: 539 [3] Ibrahim K, Wu Z Y, Zhang J, Abbas M I, Liu F Q, Qian H J. Acta Metall Sin (Engl Lett), 2001; 14: 511 [4] Sen R J, Bhattacharya S, Das S, Das K. J Alloys Compd, 2010; 489: 650 [5] Wang H X, Li Y G, Chu C L. 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