Accession Number:

AD0745474

Title:

Hot Corrosion in Gas Turbines,

Descriptive Note:

Corporate Author:

BATTELLE COLUMBUS LABS OHIO METALS AND CERAMICS INFORMATION CENTER

Personal Author(s):

Report Date:

1972-06-01

Pagination or Media Count:

61.0

Abstract:

The problem of accelerated corrosion of high-temperature gas-turbine alloys in circumstances where sodium chloride or other salts are ingested with the combustion air or in the fuel has been known for many years, and is usually attributed largely to the presence of sodium sulfate, which is either present in the ingested salts or formed by reaction between sodium chloride and sulfur in the fuel. The problem has become more important because of two related developments the increase in turbine inlet temperatures and the reduction of chromium content in modern superalloys. In the report, a brief outline of the early research is presented, to elucidate the nature of the problem. The thermochemistry of the more important reactions involved is then described. The incidence of the attack in the engine is difficult to predict, and depends very much on the particular alloy since a complete fundamental characterization of the process is impossible, there has been considerable interest in testing procedures, and the more important methods are described in the next section. For the same reason, research in the last few years has followed two separate paths one concerned with phenomenological testing of alloys and the other concerned with the determination of the reaction mechanism. These two types of research are described separately. Author

Subject Categories:

  • Properties of Metals and Alloys
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE