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<p>In the present study, (Ti,Nb)N-based composite coatings with a thickness of 250&#xa0;μm are prepared using reactive plasma spraying technology, and the effect of Nb content on structure, conductivity, and corrosion resistance is investigated. The (Ti,Nb)N-based composite coatings with a crystal size of 40-200&#xa0;nm have multi-layered structures, and each layer is composed of NbTiN<sub>2</sub>, Ti<sub>3</sub>O, and Nb. As the Nb content increases, the density of the coating increases, and the Nb-30 wt.% coating exhibits the highest density. The Nb-30 wt.% coating exhibits the lowest interfacial contact resistance (12.58 mΩ&#xa0;cm<sup>2</sup>) under a compaction force of 1.5&#xa0;MPa. In a simulated proton exchange membrane fuel cell (PEMFC) environment, the Nb-30 wt.% coating demonstrated superior corrosion resistance and stability. In the potentiostatic polarization tests at 0.6 and 1.2&#xa0;V, compared with the other two coatings, the corrosion current density of the Nb-30 wt.% coating stabilizes first. The Nb-30 wt.% coating exhibits a higher corrosion potential and a lower corrosion current density compared to 45# steel. During prolonged corrosion testing, defects in the coating are gradually sealed by corrosion products generated from the reaction between the corrosive solution and the NiCrAlY bonding layer, resulting in a "self-sealing" effect and enhanced corrosion resistance.</p>

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Influence of Microstructure on the Conductivity and Corrosion Resistance in the (Ti,Nb)N-Based Protective Coating

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Dongshu Zhao,
  • Jianing Liu,
  • Yuxin Wang,
  • Zhihui He,
  • Xing Yang,
  • Yanchun Dong,
  • Yong Yang,
  • Hongjian Zhao

摘要

In the present study, (Ti,Nb)N-based composite coatings with a thickness of 250 μm are prepared using reactive plasma spraying technology, and the effect of Nb content on structure, conductivity, and corrosion resistance is investigated. The (Ti,Nb)N-based composite coatings with a crystal size of 40-200 nm have multi-layered structures, and each layer is composed of NbTiN2, Ti3O, and Nb. As the Nb content increases, the density of the coating increases, and the Nb-30 wt.% coating exhibits the highest density. The Nb-30 wt.% coating exhibits the lowest interfacial contact resistance (12.58 mΩ cm2) under a compaction force of 1.5 MPa. In a simulated proton exchange membrane fuel cell (PEMFC) environment, the Nb-30 wt.% coating demonstrated superior corrosion resistance and stability. In the potentiostatic polarization tests at 0.6 and 1.2 V, compared with the other two coatings, the corrosion current density of the Nb-30 wt.% coating stabilizes first. The Nb-30 wt.% coating exhibits a higher corrosion potential and a lower corrosion current density compared to 45# steel. During prolonged corrosion testing, defects in the coating are gradually sealed by corrosion products generated from the reaction between the corrosive solution and the NiCrAlY bonding layer, resulting in a "self-sealing" effect and enhanced corrosion resistance.