Renewed interest in direct coal-fired gas turbines has led to a close examination of the potentially corrosive effects of coal combustion products on turbine blade materials. Short-term tests using a subscale turbine combustor were run with coal-water fuels (CWF) having coal ash levels around 1%. Deposits formed at gas temperatures of 1100°C (2000°F) on the CoCrAIY-coated specimens cooled to a turbine vane surface temperature of 980°C (1800°F). The deposit-coated specimens were subsequently exposed for 1484 h in a furnace-simulated turbine atmosphere at 980°C (1800°F). Examination of the test specimens showed that two atypical forms of corrosion occurred during exposure to combustor products. Accelerated oxidation was observed after the furnace tests. Additional work is recommended to more fully explore the effects of alternative coal feedstock and degree of coal cleaning on corrosion for this application.