Erosion-Corrosion of As-Plasma-Sprayed and Laser-Remelted NiCrAlY Bond Coats in Working Conditions of a Coal-Fired Boiler

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Erosion-Corrosion of As-Plasma-Sprayed and Laser-Remelted NiCrAlY Bond Coats in Working Conditions of a Coal-Fired Boiler

BUTA SINGH SIDHU; PRAKASH, S

Corrosion (Houston, Tex.), 01/2008, Volume: 64, Issue: 1

Journal Article

Ni-22Cr-10Al-1Y plasma spray coating has been formulated on boiler tube steels, namely, low-carbon steel ASTM SA210-Grade A1, 1Cr-0.5Mo steel ASTM SA213-T-11, and 2.25Cr-1Mo steel ASTM SA213-T-22. The coated steels also have been laser-remelted using a Nd:YAG laser. The degradation behavior of as-sprayed and laser-remelted coatings have been evaluated in actual conditions in a coal-fired boiler for 1,000 h at 755°C. The laser remelting has been found to be effective to increase the degradation resistance of plasma-sprayed boiler steels. ASTM SA213-T-22-coated and laser-remelted steel has proved to be most effective in resistance to degrading species. PUBLICATION ABSTRACT

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