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<p>Fretting wear and liquid lead-bismuth eutectic (LBE) corrosion pose a serious threat to the structural integrity of heat-transfer tubes in lead-bismuth-cooled fast reactors. To address this coupled degradation, CrAlN and CrAlSiN coatings were deposited on 316H stainless steel by multi-arc ion plating. Their microstructure, corrosion resistance in static LBE at 480&#xa0;°C for 2000&#xa0;h, and fretting wear behavior under molten LBE (280&#xa0;°C and 480&#xa0;°C, displacement amplitudes of 60&#xa0;μm and 120&#xa0;μm) were investigated. The as-deposited coatings were dense, adherent, and exhibited a nanolayered structure. After prolonged corrosion, both coatings showed only slight surface oxidation and effectively blocked Pb-Bi penetration and Ni outward diffusion. Fretting tests demonstrated that the coatings significantly reduced wear volume (by factors of 1.5–2.7) compared with the uncoated substrate. The CrAlSiN coating reduced wear volume by factors of 1.1–1.5 compared with the CrAlN coating. The coatings exhibited a hardness up to approximately 28 GPa, which is 9.3–9.5 times that of the 316H substrate, along with significantly enhanced H/E and H<sup>3</sup>/E<sup>2</sup> ratios. The protective mechanism is attributed to the coatings’ high hardness, favorable H/E and H<sup>3</sup>/E<sup>2</sup> ratios, and their layered nanostructure, which acts as a barrier and undergoes sequential wear. This work confirms that CrAlN-based coatings are promising surface solutions for enhancing the longevity of components in LBE-cooled nuclear systems.</p>

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Fretting Wear and Corrosion Behavior Study of CrAlN and CrAlSiN Coatings in Lead-Bismuth Environment (LBE)

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Zuhan Yuan,
  • Jiaojiao Ma,
  • Bangyang Xiao,
  • Xiujie He,
  • Naibin Jiang

摘要

Fretting wear and liquid lead-bismuth eutectic (LBE) corrosion pose a serious threat to the structural integrity of heat-transfer tubes in lead-bismuth-cooled fast reactors. To address this coupled degradation, CrAlN and CrAlSiN coatings were deposited on 316H stainless steel by multi-arc ion plating. Their microstructure, corrosion resistance in static LBE at 480 °C for 2000 h, and fretting wear behavior under molten LBE (280 °C and 480 °C, displacement amplitudes of 60 μm and 120 μm) were investigated. The as-deposited coatings were dense, adherent, and exhibited a nanolayered structure. After prolonged corrosion, both coatings showed only slight surface oxidation and effectively blocked Pb-Bi penetration and Ni outward diffusion. Fretting tests demonstrated that the coatings significantly reduced wear volume (by factors of 1.5–2.7) compared with the uncoated substrate. The CrAlSiN coating reduced wear volume by factors of 1.1–1.5 compared with the CrAlN coating. The coatings exhibited a hardness up to approximately 28 GPa, which is 9.3–9.5 times that of the 316H substrate, along with significantly enhanced H/E and H3/E2 ratios. The protective mechanism is attributed to the coatings’ high hardness, favorable H/E and H3/E2 ratios, and their layered nanostructure, which acts as a barrier and undergoes sequential wear. This work confirms that CrAlN-based coatings are promising surface solutions for enhancing the longevity of components in LBE-cooled nuclear systems.