EFFECT OF Ni-La_2O_3 ELECTRODEPOSITED COMPOSITE FILM ON THERMAL CYCLING OXIDATION OF Ni

Acta Metall Sin

1996, Vol. 32

Issue (2): 180-186 DOI:

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EFFECT OF Ni-La_2O_3 ELECTRODEPOSITED COMPOSITE FILM ON THERMAL CYCLING OXIDATION OF Ni

PENG Xiao; LITiefan; LI Meishuan; MA Xinqing; PING Dehai(State Key Laboratory of Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015)(Laboratory of Atomic Imaging of Solids; Institute of Metal Reserch; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1995-06-07; in revised form 1995-10-06)

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Abstract The thermal cycling oxidation resistance of Ni with a Ni-La_2O_3 electrodeposited composite film of 30 μm in thickness is significantly improved in comparison to Ni with and without Ni-plating for 100 h-cyclic oxidation at 1273 K. The rapid growth and severe cracking of scale-on Ni with or without Ni-plating occurred during the thermal cycling process, but the application of Ni-La_2O_3 electrodeposited composite film on Ni resulted in a markable reduction of NiO growth and the scale has finer grain, non-cracking morphology. Electron probe microanalyses revealed that in the total NiO scale with an average thickness of about 50 μm, La_2O_3 was located in the region of about 31 μm near the scale / gas interface. High resolution electron microscopy showed that in the codeposited film La_2O_3 nanoparticles below 5 nm is in the dispersive or cluster state- Therefore, it is proposed that the modification of oxidation mechanism and mechanical property of the scale of Ni With Ni-La_2O_3 electrodeposited composite film may resulted from the partial dissolution of La_2O_3 with nano-size, and the segregation of La~(3+) at the NiO grain boundaries, which prevent the short distance diffusion of Ni~(2+).(Correspondent. PENG Xiao, Institute of Corrosion and Protection of Metals, Chinese Academy of Sciences,Shenyang 110015)

Key words: electrodeposited composite film Ni La_2O_3 thermal cycling oxidation

Received: 18 February 1996

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1996/V32/I2/180

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