Hot Corrosion Behavior of Modified Aluminide Coatings on Cobalt-Base Superalloys

摘要

Marine gas turbines experience a number of detrimental operating conditions as a result of environment and fuel variation. There are two types of hot corrosion which occur in marine and other types of gas turbines known as low temperature hot corrosion and high temperature hot corrosion. Protective coatings are necessary and have been widely used to improve hot corrosion resistance for superalloys operating in this environment. Considerable data can be obtained from the literature on systems applied to nickel-base superalloys while little data are available on similarly coated cobalt-base superalloys. This study was initiated to evaluate the behavior of modified coatings on a series of cobalt-base superalloys in both high and low temperature hot corrosion.