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Erosion-corrosion of plasma as sprayed and laser remelted Stellite-6 coatings in a coal fired boiler |
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| Affiliation: | 1. Dept. Of Chemical Engineering, Materials and Environment, Sapienza University of Rome, Italy;2. INSTM Reference Laboratory for Engineering of Surface Treatments, Rome, Italy;3. Centro Sviluppo Materiali S.p.A., Lamezia Terme (CZ) Branch Office, Italy;1. School of Mechanical, Materials & Energy Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab, India;2. Department of Chemistry, Indian Institute of Technology Ropar, Rupnagar, Punjab, India;3. High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul, Republic of Korea;4. International Advanced Research Centre for Powder Metallurgy & New Materials (ARCI), Hyderabad 500005, India |
| Abstract: | Unacceptable levels of surface degradation of metal containment walls and heat exchanger tubing by a combined erosion-corrosion (E-C) mechanism have been experienced in some boilers. The recent use of coatings to protect the heat exchanger tubes of fluidized bed combustor from E-C problems has been suggested by many authors. The laser remelting of the surface coating is suggested as a promising technique to improve its physical properties.Aim of the present investigation is to evaluate the erosion-corrosion (E-C) behaviour of plasma as sprayed and laser remelted Stellite-6 (St-6) coatings on boiler tube steels in the actual coal fired boiler environment. The cyclic experimental studies were performed in the platen superheater zone of a coal fired boiler where the temperature was around 755 °C and the study was carried out upto 10 cycles each of 100 h duration followed by 1 h cooling at ambient temperature. Coated steels were found to possess higher resistance to E-C than the uncoated steels. The highest degradation resistance has been indicated by the T11 steel coated and subsequently laser remelted. |
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