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97141 New Coatings for Protection against Corrosion in Fossil Fuel Combustion Environments

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Product Number: 51300-97141-SG
ISBN: 97141 1997 CP
Author: T. Shmyreva, F. Easterly, A. Verstsk, S. Baranovski
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A new technique of Ni-Cr 50/50 coating processing has been developed for fossil fuel boiler tube protection against fire-side corrosion, The technology involves the electric arc process where molten wires are atomized by a supersonic jet of hot propane-air combustion products. The small size and high velocity of atomized particles lead to the formation of dense coatings, while the reducing environment in the starting jet section prevents the material from rapid oxidation. Gas permeation measurements revealed that combustion arc sprayed coatings are substantially less permeable than high velocity oxygen fuel and regular electric arc coatings. Elevated temperature corrosion tests proved the superior performance of combustion arc sprayed coatings in reducing H2S containing environment and under KCI+ Na2SO4 salts deposits in air. Keywords boiler, tire-side corrosion, combustion, supersonic jet, electric arc, mating, apparent porosity, gas permeable, oxidation hydrogen sulfide corrosion, salt-ash corrosion, depth of sulfur permeation
A new technique of Ni-Cr 50/50 coating processing has been developed for fossil fuel boiler tube protection against fire-side corrosion, The technology involves the electric arc process where molten wires are atomized by a supersonic jet of hot propane-air combustion products. The small size and high velocity of atomized particles lead to the formation of dense coatings, while the reducing environment in the starting jet section prevents the material from rapid oxidation. Gas permeation measurements revealed that combustion arc sprayed coatings are substantially less permeable than high velocity oxygen fuel and regular electric arc coatings. Elevated temperature corrosion tests proved the superior performance of combustion arc sprayed coatings in reducing H2S containing environment and under KCI+ Na2SO4 salts deposits in air. Keywords boiler, tire-side corrosion, combustion, supersonic jet, electric arc, mating, apparent porosity, gas permeable, oxidation hydrogen sulfide corrosion, salt-ash corrosion, depth of sulfur permeation
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