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In modern industrial world, engineering components are prone to
more rapid surface degradation such as erosion-corrosion,
overheating, wear, solid particle abrasion, high temperature
corrosion, etc. Due to above surface degradation, major problems
causes tube wall thinning, results in premature failure of the
super heater and reheater tubes. Alloys used at high temperature
should possess good mechanical properties along with erosion -
corrosion resistance. The present study behavior of boiler steel
ASTM-SA213 T-22 (used in most of the power plants in the Northern
India) has been investigated for high temperature erosion-corrosion
behavior in the uncoated as well as coated condition. Detonation
Gun thermal spraying process was used for coating on boiler steel.
SEM/EDAX, XRD and X-ray mapping analysis done to reveal the
microstructure and compositional features of boiler steel. The
microstructure indicates uniform and dense coating.
Thermogravimetric techniques is used to investigate the
erosion-corrosion behavior at 900 C for 1000 hours. SEM/EDAX, XRD
and X-ray mapping techniques were used to analyze the corrosion
products."
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