Abstract
X-ray diffraction analysis has been used to study the oxide phase composition of the surface of nickel-base alloys, which have different alloying levels under air conditions, and in tests with an ash film environment. Several stages of phase reaction and the directivity of phase reactions during oxidation have been revealed. The lattice parameter of the spinel oxide depends on the alloy content (mainly Cr/Al ratio). The surface structure of gas turbine blades after service in power plants and gas compressor stations has been examined. The different types of sulphate, oxide and sulphide compounds formed on the uncoated blade surface have been established. This suggested the development of sulphide-oxide corrosion process. The surface study of MCrAlY-coated blades revealed the formation of different types oxides during operation.
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