Type 1 and 2 hot corrosion attack has been observed on certain marine gas turbine engines in the area of the first stage turbine hardware. In order to improve the service life of these engines, laboratory testing of the current, baseline coating and several candidate replacement coatings was initiated using a low-velocity, atmospheric-pressure burner-rig (LVBR). This paper examines the LVBR results of these high temperature coatings on Alloy 509 to determine the relative hot corrosion resistance relative to the baseline coating.
Keywords: hot corrosion, aluminide coatings, overlay coatings, Alloy 509, sulfidation, MCrAlY coatings, marine gas turbine