Kiatisereekul, A.; Siripongsakul, T.; Fakpan, K. Erosion Behavior of Stellite-6 and WC-12Co Coatings on SA213-T22 Boiler Steel. Coatings2023, 13, 1444.
Kiatisereekul, A.; Siripongsakul, T.; Fakpan, K. Erosion Behavior of Stellite-6 and WC-12Co Coatings on SA213-T22 Boiler Steel. Coatings 2023, 13, 1444.
Kiatisereekul, A.; Siripongsakul, T.; Fakpan, K. Erosion Behavior of Stellite-6 and WC-12Co Coatings on SA213-T22 Boiler Steel. Coatings2023, 13, 1444.
Kiatisereekul, A.; Siripongsakul, T.; Fakpan, K. Erosion Behavior of Stellite-6 and WC-12Co Coatings on SA213-T22 Boiler Steel. Coatings 2023, 13, 1444.
Abstract
At Mae-Moh power plant, Thailand, superheater tubes, which are exposed in fly ash environ-ment, often degrade due to solid particle erosion. To extend the service lifetime of the superheater tubes, the high velocity oxy-fuel (HVOF) thermal spray technique is used to deposit a protective coating on the material, SA213-T22 steel. In this work, the solid particle erosion of the Co-28Cr and WC-12Co coatings was investigated using erodent particle impingement at the angles of 30o and 90o with an average particle size of 60 μm. The erosion behavior of SA213-T22 with and without Co-28Cr and WC-12Co coatings was explained using ductile and brittle erosion modes. The erosion test resulted in the brittle mode for both Co-28Cr and WC-12Co coatings, while SA213-T22 without coating indicated the ductile mode. On the investigation of surface morphology, the Co-28Cr coating showed mostly microcracks in contrast with the WC-12Co coating, fracture, de-bonding and deep cavities were also observed. Erosion resistance of the Co-28Cr coating was significantly higher than the WC-12Co coating, due to high hardness, low porosity and high density of the coating.
Keywords
High velocity oxy-fuel; WC-Co; Co-28Cr; microhardness; erosion; T22 steel
Subject
Chemistry and Materials Science, Surfaces, Coatings and Films
Copyright:
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