STATE‐OF‐THE‐ART SURVEY ON HOT CORROSION IN MARINE GAS TURBINE ENGINES

Abstract

This summary describes a state-of-the-art survey of hot corrosion problems which can seriously limit the suitability of gas-turbine engines for marine propulsion systems. Catastrophic attack of nickel- and cobalt-base superalloys at temperatures above 1550 F is attributed to the action of a molten slag that forms by the reaction of ingested sea salt and sulfur contained in the fuel. A general lack of agreement was foudn to exist among investigators on the mechanisms of sulfidation corrosion, methods of sorting and screening materials, resistance os specific materials to attack, and proposed solutions to the problem. Nevertheless, the collected information provided valuable guidance in formulating the Navy's Marine Gas-Turbine Alloy Development Program. A description of this program and specifications selected for standardized equipment to evaluate sulfidation resistance are presented. (Author)