Development of a metal dusting resistant coating by Sn and Al pack cementation

S. Madloch, M.C. Galetz, C. Geers, M. Schütze

Surface and Coatings Technology  299 (2016), 29-36, DOI: 10.1016/j.surfcoat.2016.04.067

A new coating against metal dusting is developed by the combination of a catalytic inhibition approach with a classical oxide barrier. Coatings were manufactured by co-deposition of tin and aluminum on nickel plated alloy 800H via powder pack cementation with different dwell times. The resulting coatings consist of two phases, a nickel-aluminide phase as oxide forming reservoir and an underlying nickel-tin phase which catalytically inhibits carbon deposition. Coated samples were exposed to H2-22%CO-10%H2O as a laboratory metal dusting environment as well as air at 620 °C. Cross sectional analysis revealed no sign for metal dusting and the formation of a thin alumina layer at the surface.

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