Study on the Corrosion Behaviour of Nickel-Base Alloy 625 in Landfill Leachate Treated by Supercritical Water Oxidation

Abstract:

Experiments were conducted to study the corrosion behaviors of nickel-base alloy 625 under various temperature and oxygen fluxes, since severe corrosion always happens in landfill leachate treated by supercritical water oxidation. It indicates that under the condition of various oxygen fluxes, corrosion rates of nickel-base alloy 625 have similar variation, but at different temperature, such variation of corrosion rates can not be found, which implies oxygen fluxes may have more effects on corrosion rate than temperature. Meanwhile, oxide films of nickel-base alloy 625 changed obviously from low oxygen flux to high oxygen flux. The precipitation on the surfaces of alloys are confirmed as NiCrO4, which may form by the combination of dissolved Ni²⁺ and CrO₄^2-.

• Periodical: Advanced Materials Research (Volume 908)
• Pages: 93-97
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.908.93
• Online since: March 2014
• Authors: Min Yan Xiao*
• Keywords: Corrosion, Landfill Leachate, Nickel-Base Alloy, Supercritical Water Oxidation

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