Nickel-chromium plasma spray coatings: A way to enhance degradation resistance of boiler tube steels in boiler environment
Boiler tube steels, namely low carbon steel ASTM-SA210-Grade A1 (GrA1), 1Cr-0.5Mo steel ASTM-SA213-T-11 (T11), and 2.25Cr-1Mo steel ASTM-SA213-T-22 (T22), were used as substrate steels. Ni-22Cr-10AI-1Y powder was sprayed as a bond coat 150 {mu}m thick before a 200 {mu}m final coating of Ni-20Cr was applied. Coatings were characterized prior to testing in the environment of a coal fired boiler. The uncoated and coated steels were inserted in the platen superheater zone of a coal fired boiler at around 755{sup o}C for 10 cycles, each 100 h. Coated steels showed lower degradation (erosion-corrosion) rate than uncoated steels showed. The lowest rate was observed in the case of Ni-20Cr coated T11 steel. Among the uncoated steels, the observed rate of degradation was the lowest for the T22 steel.
- OSTI ID:
- 20741038
- Journal Information:
- Journal of Thermal Spray Technology, Vol. 15, Issue 1; ISSN 1059-9630
- Country of Publication:
- United States
- Language:
- English
Similar Records
Erosion-corrosion of as-plasma-sprayed and laser-remelted NiCrAlY bond coats in working conditions of a coal-fired boiler
Evaluation of the behavior of shrouded plasma spray coatings in the platen superheater of coal-fired boilers