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<p>High-strength biodegradable Zn alloys lack tribocorrosion studies. This study developed a Zn-0.5Li alloy achieving yield strength (307.5 MPa), ultimate tensile strength (466.5 MPa), and hardness (119.2 HV), 8.3, 4.7, and 3.6 times higher than pure Zn. In phosphate-buffered saline (PBS), the alloy’s high strength and dense Li<sub>3</sub>PO<sub>4</sub> corrosion products reduced wear by 70% compared to pure Zn. Under open-circuit potential conditions, material loss of the alloy comprises 12% mechanical wear, 85% corrosion-induced wear, and 3% wear-induced corrosion. Micro-galvanic corrosion between Zn and β-LiZn<sub>4</sub> phases promotes cracking and detachment, which enhances corrosion-induced wear. A 20 nm bovine serum albumin adsorption layer on the alloy surface forms after 24 h immersion, reducing wear area by 81% during tribocorrosion. This work establishes a microstructure-driven anti-tribocorrosion mechanism, guiding future Zn alloy design.</p>

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Tribocorrosion mechanism of biodegradable high-strength Zn-0.5Li alloy and pure Zn with bovine serum albumin adsorption

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月6日

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  • Bo-Yao Li,
  • Wen-Bo Geng,
  • Zhang-Zhi Shi,
  • Wei Yin,
  • Hai-Jun Zhang,
  • Yu Yan,
  • Da-Wei Zhang,
  • Lu-Ning Wang

摘要

High-strength biodegradable Zn alloys lack tribocorrosion studies. This study developed a Zn-0.5Li alloy achieving yield strength (307.5 MPa), ultimate tensile strength (466.5 MPa), and hardness (119.2 HV), 8.3, 4.7, and 3.6 times higher than pure Zn. In phosphate-buffered saline (PBS), the alloy’s high strength and dense Li3PO4 corrosion products reduced wear by 70% compared to pure Zn. Under open-circuit potential conditions, material loss of the alloy comprises 12% mechanical wear, 85% corrosion-induced wear, and 3% wear-induced corrosion. Micro-galvanic corrosion between Zn and β-LiZn4 phases promotes cracking and detachment, which enhances corrosion-induced wear. A 20 nm bovine serum albumin adsorption layer on the alloy surface forms after 24 h immersion, reducing wear area by 81% during tribocorrosion. This work establishes a microstructure-driven anti-tribocorrosion mechanism, guiding future Zn alloy design.