The relevance of corrosion data obtained from laboratory experiments to the performance of Ni–Cr–base alloys in service in gas turbines is considered. The gas turbine is used in a variety of environments and operating conditions, and an attempt is made to relate these various factors to the corrosion of engine components. The test methods commonly used are considered, and it is concluded that burner rigs provide the best means of simulating the engine environment. Particular emphasis is placed on the choice of contaminant concentration used in burner rig testing, and it is shown that conditions should be selected so as to achieve a simulation of deposition rates found on blades by using equivalent contaminant flux rates. Finally, the behaviour of some coated components in tests and service is described.
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