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-SA213T-11 (T11), and 2.25Cr-1Mo steel ASTM-SA213-T-22(T22), were used as substrate steels. Ni-22Cr-10Al-1Y powder was sprayed as a bond coat 150 mum thick before a 200 mum final coating of Ni-20Cr was applie...

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Bibliographic Details
Published in:Journal of thermal spray technology 2006-03, Vol.15 (1), p.131-140
Main Authors: BUTA SINGH SIDHU, PRAKASH, S
Format: Article
Language:English
Subjects:
20 FOSSIL-FUELED POWER PLANTS
Applied sciences
Boiler tubes
BOILERS
Carbon tools steels
CHROMIUM
Chromium molybdenum steels
Coal
Coating
CORROSION RESISTANCE
Degradation
Erosion rates
Exact sciences and technology
Metallic coatings
Metals. Metallurgy
NICKEL
Nickel base alloys
Production techniques
SPRAY COATING
SPRAYED COATINGS
Sprays
STEELS
Superalloys
Superheaters
Surface treatment
TUBES
WEAR RESISTANCE
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Summary:Boiler tube steels, namely low carbon steel ASTM-SA210-Grade A1 (GrA1), 1Cr-0.5Mo steel ASTM-SA213T-11 (T11), and 2.25Cr-1Mo steel ASTM-SA213-T-22(T22), were used as substrate steels. Ni-22Cr-10Al-1Y powder was sprayed as a bond coat 150 mum thick before a 200 mum final coating of Ni-20Cr was applied. Coatings were characterized prior to testing in the environment of a coal fire boiler. The uncoated and coated steels were inserted in the platen superheater zone of a coal fired boiler at around 755 deg 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.
ISSN:1059-9630
1544-1016
DOI:10.1361/105996306X92695