Engine experience must be the final arbiter of the most suitable materials and coatings to minimize turbine corrosion. Facts and examples obtained on Rolls-Royce industrial and marine gas turbines are presented. Rig tests provide useful advance information by filtering out unsatisfactory materials and coatings before fixing engine standard for service trials. However, for definitive answers, most rigs are limited in one form or another. Running results show that different engine types under similar environmental conditions give different rates of corrosion. Cooling configuration has highlighted sulphidation in two or more forms and has defined their positions on the hardware. Extended cyclic running, under aggressive conditions, with various material and coating combinations gives results which suggest the need for two layer coating systems.

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