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CHEN Liyan, CHENG Jie, WU Yuping, LONG Weiyang. Influence of Cr content on hot corrosion behavior of Nickel-based alloy coatings at high temperature[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(4): 103-106. DOI: 10.12073/j.hjxb.20170424
Citation: CHEN Liyan, CHENG Jie, WU Yuping, LONG Weiyang. Influence of Cr content on hot corrosion behavior of Nickel-based alloy coatings at high temperature[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(4): 103-106. DOI: 10.12073/j.hjxb.20170424
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Influence of Cr content on hot corrosion behavior of Nickel-based alloy coatings at high temperature

  • College of Mechanics and Materials, Hohai University, Nanjing 210098, China

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  • Received Date: November 13, 2014
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  • Three coatings were deposited on 20G steel by high velocity arc spay technique. Microstructures of these coatings were characterized by optical microscope, scanning electric microscope equipped with EDS. Phases were identified by X-ray diffraction analysis. Hot corrosion trials of these high Cr content coatings were conducted under the mixed sulfates Na2SO4+K2SO4 layer at 650 ℃. The results showed that hot corrosion kinetic curves fitted well to the parabolic laws, NiO and Cr2O3 protective oxide scales have been formed on the surface of four corroded coatings. As the increasing Cr content, the Cr2O3 content in the protective oxide scales was gradually increased and the NiO content was reduced, resulted in a significantly enhance in hot corrosion resistance. The corrosion resistance properties of the Ni-30Cr, Ni-45Cr and Ni-50Cr were approximately 10, 15 and 20 times higher than that of 20G steel. In addition, the hot corrosion resistance of Ni-50Cr coating was about 1.4 times of that of Ni-Cr-Ti coating (Tafa 45CT).
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