High Temperature Oxidation and Corrosion of Spark Plasma Sintered FeCrAlTiY-10 Mass% MoSi2 Coating on Low Carbon Steel

Abstract

In the present study, we prepared the FeCrAlTiY-10 mass% MoSi2 coating on low carbon steel using the spark plasma sintering (SPS) technique. Its resistance against oxidation and corrosion was studied in air and atmosphere containing 20 mass% NaCl at 700oC for 8 cycles. The results show that a dense coating layer is composed by FeCr containing Al and MoSi2 phases. After high temperature oxidation test, a thin protective Al2O3 layer was formed. While mix oxide scales composing of (Cr,Fe)2O3, Al2O3, and Fe3O4 were formed after high temperature corrosion test. Althought, the affected area after corrosion test was more severe than after oxidation test, the corroded sample somehow had a lower mass gain compared to oxidized sample after 8 cycles exposure. This could be related to the effect of chlorine ions and oxide spallation during cyclic corrosion test.