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<p>This study employs a hybrid mixture of Si<sub>3</sub>N<sub>4</sub> powder and ZrO<sub>2</sub> ceramic spheres in ultrasonic shot peening (USP) to improve corrosion resistance in GCr15 bearing steel. The effects of varying peening durations were systematically evaluated by characterizing surface morphology, microhardness, X-ray diffraction patterns, XPS spectra, grain/dislocation distributions, textural strength, and electrochemical behavior (including OCP, EIS, PDP measurements). Results reveal that the 8-min USP-treated sample exhibits optimal corrosion resistance, demonstrating a polarization resistance (Rp) of 1683.40 Ω·cm²—approximately 214% higher than 536.34 Ω·cm² for the untreated sample. The longer treatment times (e.g., 12&#xa0;min) reduce the texture intensity and increase the surface roughness, which negatively affect the corrosion resistance. The enhanced corrosion performance is attributed to two key factors: (1) the formation of a protective Si<sub>3</sub>N<sub>4</sub> coating and a dense oxide film (comprising Cr<sub>2</sub>O<sub>3</sub>, Fe<sub>2</sub>O<sub>3</sub>, and Fe<sub>3</sub>O<sub>4</sub>) that effectively inhibits corrosive species penetration, and (2) microstructural modifications including grain refinement, elevated dislocation density, and enhanced texture intensity induced by severe plastic deformation during USP. These findings provide insights into how hybrid ceramic media USP can improve the corrosion resistance of bearing steels.</p>

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Enhanced Corrosion Resistance of GCr15 Bearing Steel Via Ultrasonic Shot Peening with ZrO2/Si3N4 Hybrid Media for in Situ Formation of Protective Si3N4 Coating and Oxide Layer

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Zhuan Zhao,
  • Anqi Lin,
  • Qiuhao Chen,
  • Yunqi Zhong,
  • Pei He,
  • Wenhao Dou,
  • Jinrui Xiao,
  • Bokai Liao

摘要

This study employs a hybrid mixture of Si3N4 powder and ZrO2 ceramic spheres in ultrasonic shot peening (USP) to improve corrosion resistance in GCr15 bearing steel. The effects of varying peening durations were systematically evaluated by characterizing surface morphology, microhardness, X-ray diffraction patterns, XPS spectra, grain/dislocation distributions, textural strength, and electrochemical behavior (including OCP, EIS, PDP measurements). Results reveal that the 8-min USP-treated sample exhibits optimal corrosion resistance, demonstrating a polarization resistance (Rp) of 1683.40 Ω·cm²—approximately 214% higher than 536.34 Ω·cm² for the untreated sample. The longer treatment times (e.g., 12 min) reduce the texture intensity and increase the surface roughness, which negatively affect the corrosion resistance. The enhanced corrosion performance is attributed to two key factors: (1) the formation of a protective Si3N4 coating and a dense oxide film (comprising Cr2O3, Fe2O3, and Fe3O4) that effectively inhibits corrosive species penetration, and (2) microstructural modifications including grain refinement, elevated dislocation density, and enhanced texture intensity induced by severe plastic deformation during USP. These findings provide insights into how hybrid ceramic media USP can improve the corrosion resistance of bearing steels.