High-Temperature Corrosion Behavior of a Nickel-Based Superalloy in HCl-Containing Atmosphere
Received date: 2023-02-20
Revised date: 2023-08-20
Online published: 2023-12-25
Supported by
National Key Research and Development Program of China(2021YFA1600603);Science Center for Gas Turbine Project(P2022-C-IV-001-001);National Natural Science Foundation of China(52271042);National Natural Science Foundation of China(51911530154);National Natural Science Foundation of China(91860201);National Natural Science Foundation of China(U2141206);National Science and Technology Major Project(J2019-VI-0010-0124)
Superalloys are widely used in aviation, aerospace, energy, transportation, and petrochemical industries due to their excellent properties, such as high-temperature strength, plasticity, fracture toughness, oxidation resistance, and hot corrosion resistance. They are primarily employed in aircraft engines and gas turbines within aviation, marine, and power generation sectors. Furthermore, due to the unique properties of superalloys and continuous advancements of superalloy technology, their applications are expanding into increasingly extreme service environments. In order to simulate the harsh working conditions of materials under high temperature and high concentration HCl environment, the hot corrosion behavior of a nickel-based superalloy was investigated at 960 oC in a mixed atmosphere of 5%HCl + 0.5%O2 + Ar (volume fraction) using XRD, SEM, EDS, and EPMA techniques. Hot corrosion tests were conducted for 200 h. Analysis of corrosion kinetics, types and distribution of corrosion products, and cross-sectional elemental mapping revealed two distinct stages (0-75 h and 75-200 h), both showing an initial increase followed by a decrease in corrosion rate. Volatile chlorides containing Mo, Ti, and Cr formed extensively. The corrosion layer exhibited a poorly protective (Cr, Ti)-rich oxide layer, while no continuous Al2O3 layer was observed. The Ta-rich spinel layer inhibited outward diffusion of metal ions. The corrosion layer of the experimental alloy did not exhibit any significant chloride concentration on its cross-section. In addition to HCl and O2 in the atmosphere, Cl2 generated through chlorination and oxidation processes reacted with the alloy and played an important role in accelerating oxidation at 960 oC, without evidence of intermediate-temperature activated oxidation.
ZHOU Yiming , HAN Yongjun , XIE Guang , ZHENG Wei , XIAO Yanbin , PAN Yang , ZHANG Jian . High-Temperature Corrosion Behavior of a Nickel-Based Superalloy in HCl-Containing Atmosphere[J]. Acta Metall Sin, 2025 , 61(5) : 770 -782 . DOI: 10.11900/0412.1961.2023.00070
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