Gas Turbine Bucket Corrosion Protection Developments

Abstract

This paper describes a joint General Electric/ARAMCO program for improving rotating gas turbine parts lives in desert environments with high concentrations of alkali salts and sulfur-containing fuels. A description of the environment is given along with a definition of the hot corrosion problem. A series of buckets coated with experimental or developmental coatings produced by a variety of processes such as pack cementation, physical vapor deposition, plasma spray and sheet claddings are described and results from actual field trials are discussed. Pt-Cr-Al pack cementation coatings were observed to perform well. Next generation overlay coatings of the MCr-AlY-type applied by plasma spraying electron beam and sheet cladding processes also performed well.

Corrosion and Corrosion Control in Gas Turbines: Part II — The Turbine Section

“…Only limited service behaviour data are available on this latter system and these data, e.g. [20], do not indicate a significant life improvement over the uncoated IN 738 service life. The initial application of a Pt-layer (or e.g.…”

Platinum Modified Aluminides-Present Status

“…The principal use for LDC-2E and RT22A coatings during the late 70's and early 80's was to provide hot corrosion protection in land based gas turbine applications. This was due in large part to the outstanding performance obtained with these coatings under Type I hot corrosion conditions (Lindblad et. al., 1979;Bauer et.…”