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Nickel-chromium plasma spray coatings: A way to enhance degradation resistance of boiler tube steels in boiler environment

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Abstract

Boiler tube steels, namely low carbon steel ASTM-SA-210-Grades A1 (GrA1), 1Cr-0.5Mo steel ASTM-SA213-T-11 (T11), and 2.25Cr-1 Mo steel ASTM-SA213-T-22(T22), were used as substrate steels. Ni-22Cr-10Al-1Y powder was sprayed as a bond coat 150 μm thick before a 200 μm final coating of Ni-20Cr was applied Coatings were characterized prior to testing in the environment of a coal fire boiler. The uncoated and coated steels were inserted in the platen superheater zone of a coal fired boiler at around 755°C for 10 cycles, each 100 h. Coated steels showed lower degradation (erosion-corrosion) rate than uncoated steels showed. The lowest rate was observed in the case of Ni-20Cr coated T11 steel. Among the uncoated steels, the observed rate of degradation was the lowest for the T22 steel.

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Authors and Affiliations

  1. Department of Mechanical Engineering GZS, College of Engineering and Technology Bathinda (Punjab), 151001, India

    Buta Singh Sidhu

  2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, 247667, Roorkee, India

    S. Prakash

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  1. Buta Singh Sidhu
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  2. S. Prakash
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Sidhu, B.S., Prakash, S. Nickel-chromium plasma spray coatings: A way to enhance degradation resistance of boiler tube steels in boiler environment. J Therm Spray Tech 15, 131–140 (2006). https://doi.org/10.1361/105996306X92695

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  • DOI: https://doi.org/10.1361/105996306X92695

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