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Effect of Cerium Content on Hydrogen Resistance of ZrH1.8 MAO Coatings
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Affiliation:

1.School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;2.Inner Mongolia Key Laboratory of Thin Film and Coatings Technology, Hohhot 010051, China

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Fund Project:

National Natural Science Foundation of China (51964035); Natural Science Foundation of Inner Mongolia Autonomous Region (2019MS05020, 2020LH05017); Science and Technology Major Project of Inner Mongolia Autonomous Region (2018-810)

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    Abstract:

    The ceria-stabilized zirconia (CSZ) coating with an excellent hydrogen resistance performance was prepared by micro-arc oxidation (MAO) with cerium addition. The thickness, bonding strength, morphology, phase structure, chemical valence, and hydrogen resistance of ceramic coatings were investigated by coating thickness gauge, auto-scratch tester, scanning electron microscopy, energy dispersive X-ray spectrometer, X-ray diffraction, and X-ray photoelectron spectroscopy, and vacuum dehydrogenation experiment. Results show that CSZ ceramic coatings are mainly composed of monoclinic zirconia (m-ZrO2), tetragonal zirconia (t-ZrO2), and t-Zr0.82Ce0.18O2. With increasing the cerium content, the thickness of coating is increased. When the cerium content is 9mol%, the thickness of CSZ ceramic coating reaches the maximum of 135.5 μm, the bonding force is 52.46 N, and the hydrogen permeation reduction factor (PRF) is 19, which indicates an excellent hydrogen resistance. The cerium addition inhibits the phase transformation from t-ZrO2 to m-ZrO2, thereby promoting the formation of stable t-ZrO2 at elevated temperatures.

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[Li Shijiang, Yan Shufang, Chen Weidong, Ma Wen. Effect of Cerium Content on Hydrogen Resistance of ZrH1.8 MAO Coatings[J]. Rare Metal Materials and Engineering,2022,51(3):793~799.]
DOI:10.12442/j. issn.1002-185X.20201000

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History
  • Received:December 25,2020
  • Revised:January 22,2021
  • Adopted:February 04,2021
  • Online: March 30,2022
  • Published: March 30,2022