Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 22, Issue 8, Pages 1981-1988Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(11)61417-9
Keywords
Ni-P coating; pulse electrodeposition; overpotential; depositional mechanism; CeO2
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Funding
- Jiangsu Innovation program for Graduate Education [CXLX12_0151]
- Fundamental Research Funds for Central Unibersities, China
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Nano-CeO2 (RE) particles were co-deposited into Ni-P binary composite coatings by applying pulse current (PC) under ultrasonic (U) field. Morphology, chemical content and crystal microstructure were characterized by environmental scanning electron microscopy (E-SEM) with energy dispersive X-ray analysis (EDXA), XRD diffractometry and transmission electron microscopy (TEM). Experimental results show that Ni-P coating reinforced with 15g/L nano-CeO2, in amorphous state and with compact structure, can be improved in the microhardness from HV(0.2)580 to HV(0.2)780 by annealing at 600 degrees C for 2 h. The highest content of codeposited Ce and deposition rate can reach 2.3% and 68 mu m/h, respectively. Furthermore, the effect of RE adsorption and pulse overpotential on depositional mechanism was investigated. n-CeO2 particles or Ce4+ ions with strong adsorption capacity acted as the catalytic nucleus to improve densification effectively. During annealing at 600 degrees C for 2 h, n-CeO2 particles will uniformly adsorb on crystal grain to preferentially pad and heal up gaps of cracking Ni boundaries, promoting dispersion strengthening with refiner-grained structure.
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