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<p>Ti6Al4V alloy, with its high strength, excellent corrosion resistance, and good biocompatibility, is increasingly being used in the field of dental implants. Selective Laser Melting (SLM) technology provides an efficient manufacturing method for producing Ti6Al4V alloy medical implants. However, the effects of different process parameters on the corrosion behavior of Ti6Al4V alloy formed by SLM in simulated artificial saliva are not yet fully understood. This study investigated the effects of different laser powers and scanning speeds on the corrosion performance of SLM-formed Ti6Al4V alloy. Simulated artificial saliva was used as the electrolyte, and analyses were conducted using metallographic microscopy, scanning electron microscopy (SEM), x-ray diffraction (XRD), electrochemical testing, immersion experiments, and x-ray photoelectron spectroscopy (XPS). For SLM-formed Ti6Al4V alloy under different laser power and scanning speed conditions, metallographic microscope observations indicated that the sample surface defects were minimal under the process parameters of 180W laser power and 1000&#xa0;mm/s scanning speed. SEM observations revealed that the microstructures of the samples under different process parameters all contained α/α′ phase and β phase. XRD analysis indicated that the microstructure of the sample formed under the process parameters of 180W/1400&#xa0;mm/s had the highest content of β phase and the lowest content of α/α′ phase. Corrosion morphology observations showed that the corrosion mode of Ti6Al4V formed by SLM under different process parameters in simulated artificial saliva was pitting corrosion. XPS detection results indicate that samples with a higher content of β phase in their microstructure have a higher content of stable TiO<sub>2</sub> in their passivation film, resulting in a more stable and dense passivation film with better corrosion resistance. Electrochemical test results indicate that samples formed at 180&#xa0;W and 1000&#xa0;mm/s exhibit the best corrosion resistance compared to other process parameters.</p>

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Process Parameters and Corrosion Behavior of Selective Laser Melting Ti6Al4V Alloy in Artificial Saliva: Process Optimization and Corrosion Resistance Mechanism

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • Chenyang Fan,
  • Zhen Zhang,
  • Zhanyong Zhao,
  • Liqing Wang,
  • Yunlong Li,
  • Kai Ma,
  • Peikang Bai,
  • Fude Wang

摘要

Ti6Al4V alloy, with its high strength, excellent corrosion resistance, and good biocompatibility, is increasingly being used in the field of dental implants. Selective Laser Melting (SLM) technology provides an efficient manufacturing method for producing Ti6Al4V alloy medical implants. However, the effects of different process parameters on the corrosion behavior of Ti6Al4V alloy formed by SLM in simulated artificial saliva are not yet fully understood. This study investigated the effects of different laser powers and scanning speeds on the corrosion performance of SLM-formed Ti6Al4V alloy. Simulated artificial saliva was used as the electrolyte, and analyses were conducted using metallographic microscopy, scanning electron microscopy (SEM), x-ray diffraction (XRD), electrochemical testing, immersion experiments, and x-ray photoelectron spectroscopy (XPS). For SLM-formed Ti6Al4V alloy under different laser power and scanning speed conditions, metallographic microscope observations indicated that the sample surface defects were minimal under the process parameters of 180W laser power and 1000 mm/s scanning speed. SEM observations revealed that the microstructures of the samples under different process parameters all contained α/α′ phase and β phase. XRD analysis indicated that the microstructure of the sample formed under the process parameters of 180W/1400 mm/s had the highest content of β phase and the lowest content of α/α′ phase. Corrosion morphology observations showed that the corrosion mode of Ti6Al4V formed by SLM under different process parameters in simulated artificial saliva was pitting corrosion. XPS detection results indicate that samples with a higher content of β phase in their microstructure have a higher content of stable TiO2 in their passivation film, resulting in a more stable and dense passivation film with better corrosion resistance. Electrochemical test results indicate that samples formed at 180 W and 1000 mm/s exhibit the best corrosion resistance compared to other process parameters.