Iron aluminide coatings by electrodeposition of aluminum from an organic bath and subsequent annealing

Abstract

Oxidation-resistant Fe-Al alloy coatings were formed on Fe substrate by a process using electrodeposition of Al and annealing. Electrodeposition in a dimethylsulfone-aluminum chloride bath containing an additive at 110°C yielded a dense Al layer adherent to the Fe substrate. Annealing of the Fe substrate with the electrodeposited Al layer generated an Fe2Al 5 layer on the surface at 700°C and 800°C, and an FeAl layer at 900°C through interdiffusion. Oxidation tests at 600°C and 800°C confirmed that the FeAl layer formed through the process could act as an oxidation-resistant coating. © 2012 ISIJ.