Development of Low-Pressure Turbine Coatings Resistant to Steam-Borne Corrodents. Vol. 2: Detailed Studies

摘要

Previous evaluations were made to select four high-potential coatings for further testing: ion-vapor-deposited aluminum, sulfamate-nickel electroplate, nickel-cadmium electroplate, and Teflon. Results of six-month field U-bend test exposures in an operating steam turbine are reported. These results generally corroborate the selection of the four high-potential coatings. Fatigue testing at 100 Hz has been initiated in high-purity water and 22% NaCl (both pH 4 solutions). Tests to date generally show a benefit in using one or more of the four candidate coatings. Double U-bend kettle tests are scheduled to start in 1981 in nine test solutions. Test turbine blades have been coated with three of the candidate coatings. These blades will be placed in an operating steam turbine for a one-year test period. (ERA citation 08:045987)