The hot corrosion of low-pressure plasma-sprayed coating, GT-29 (Co-29Cr-6Al-1Y) on a γ′-strengthened nickel base superalloy, IN-738, was characterized at both 871 °C and 983 °C in a simulated gas turbine environment. The test results show that at 871 °C the dense, defect-free, low-pressure, plasma-sprayed GT-29 coatings provide good corrosion protection up to 8000 hr. The mechanism of protection was the formation of a dense, adherent Al2O3 scale underneath a mixed oxide scale; scale was maintained by a uniformly dispersed Al rich β(CoAl) reservoir. At 982 °C, the coating corrosion protection exceeded 5000 hours and also utilized a protective Al2O3 scale. Due to the higher test temperature, interdiffusion of O, S, Al, Co, and Cr was higher and internal sulfidation/oxidation of the coating occurred; however, the rates were much lower than uncoated IN-738. Field tests were run (13051 and 19842 hr) to evaluate the low-pressure, plasma-sprayed GT-29 coatings’ corrosion resistance on turbine buckets. Metallographic inspection of the field-tested coatings verified the simulated burner-rig test results and demonstrated that the low-pressure plasma process provides an attractive alternative to other coating processes for producing hot-corrosion resistant coatings.
Skip Nav Destination
Article navigation
January 1981
This article was originally published in
Journal of Engineering for Power
Research Papers
Low-Pressure Plasma-Spray Coatings for Hot-Corrosion Resistance
R. W. Smith,
R. W. Smith
General Electric Company, Schenectady, N.Y. 12345
Search for other works by this author on:
W. F. Schilling,
W. F. Schilling
General Electric Company, Schenectady, N.Y. 12345
Search for other works by this author on:
H. M. Fox
H. M. Fox
General Electric Company, Schenectady, N.Y. 12345
Search for other works by this author on:
R. W. Smith
General Electric Company, Schenectady, N.Y. 12345
W. F. Schilling
General Electric Company, Schenectady, N.Y. 12345
H. M. Fox
General Electric Company, Schenectady, N.Y. 12345
J. Eng. Power. Jan 1981, 103(1): 146-153 (8 pages)
Published Online: January 1, 1981
Article history
Received:
December 19, 1979
Online:
September 28, 2009
Citation
Smith, R. W., Schilling, W. F., and Fox, H. M. (January 1, 1981). "Low-Pressure Plasma-Spray Coatings for Hot-Corrosion Resistance." ASME. J. Eng. Power. January 1981; 103(1): 146–153. https://doi.org/10.1115/1.3230687
Download citation file:
16
Views
Get Email Alerts
Cited By
Experimental Identification Of Blade Tip Rub Forces At Engine Relevant Temperatures And Speeds
J. Eng. Gas Turbines Power
Study Of Tandem Rotor Dual Wake Interaction With Downstream Stator Under Unsteady Numerical Approach
J. Eng. Gas Turbines Power
Experimental Design Validation of a Swirl-Stabilized Burner With Fluidically Variable Swirl Number
J. Eng. Gas Turbines Power (April 2025)
Experimental Characterization of a Bladeless Air Compressor
J. Eng. Gas Turbines Power (April 2025)
Related Articles
Hot Corrosion of Gas Turbine Components
J. Eng. Power (January,1979)
Pack Cementation Coatings for Superalloys: A Review of History, Theory, and Practice
J. Eng. Gas Turbines Power (January,1988)
Aero Engine Test Experience With CMSX-4® Alloy Single-Crystal Turbine Blades
J. Eng. Gas Turbines Power (April,1996)
Role of Platinum in Thermal Barrier Coatings Used in Gas Turbine Blade Applications
J. Eng. Gas Turbines Power (February,2010)
Related Proceedings Papers
Related Chapters
Surface Analysis and Tools
Tribology of Mechanical Systems: A Guide to Present and Future Technologies
Effect of Hydrogen on Corrosion of Zircaloy-4 under Irradiation
Zirconium in the Nuclear Industry: 20th International Symposium
Combined Cycle Power Plant
Energy and Power Generation Handbook: Established and Emerging Technologies