The phenomenology of the corrosion processes in the turbine section, including the conditions which govern corrosion behaviour, like temperature, pressure, fuel quality and presence of sulphur are discussed.

Various methods to combat the corrosion attack are described: limits to be imposed on fuel and intake air impurities, the use of fuel additives, and the application of corrosion resistant materials and coatings. The background to and the merits of these methods are discussed.

Furthermore service experience with current and advanced coating systems in marine, industrial and aircraft gas turbines is reported.

Corrosion processes in the compressor section are discussed in part I.

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