Effect of Pack Al Content on Growth Kinetics at 650 °C of Ni₂Al₃ Coating Layer on Nickel-Electroplated Creep Resistant Ferritic Steels

Abstract:

The hybrid Ni₂Al₃/Ni coating was formed on creep resistant ferritic steels by firstly nickel electroplating and then partially aluminising the Ni layer at 650 °C by pack cementation process using powder mixtures of Al, AlCl₃ and Al₂O₃. The effect of pack Al content (W) on growth kinetics of the outer Ni₂Al₃ layer of the coating was investigated by varying it from 2 to 10 wt% whilst keeping the pack AlCl₃ content constant at 2 wt% and aluminising conditions at 650°C/4h. It was revealed that, once W was above a minimum level, the growth of the outer Ni₂Al₃ layer thickness depended linearly on W^1/2. The possible reasons for such growth kinetics were discussed.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 2008-2012
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.2008
• Online since: November 2011
• Authors: D.J. Wu, W.H. Hua, Zhi Dong Xiang, C.Y. Zhu
• Keywords: Ferritic Steels, Nickel Aluminide Coating, Nickel Electroplating, Pack Cementation

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