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, AlCl3and Al2O3. The effect of pack Al content (W) on growth kinetics of the outer Ni2Al3layer of the coating was investigated by varying it from 2 to 10 wt% whilst keeping the pack AlCl3content 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 Ni2Al3layer thickness depended linearly on W1/2. The possible reasons for such growth kinetics were discussed.
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