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<p>The poor surface quality of selectively laser melted Ti6Al4V limited its application in critical fields. When using the solution with the solvent of ethylene glycol, electropolishing (EP) is an environmentally friendly method to improve surface roughness. However, the influence of the water absorption property of ethylene glycol on the surface roughness is rarely reported. In this study, polarization curve tests indicated that the solution with a suitable drying time had a better passivation ability than the undried solution. After EP with a voltage of 18&#xa0;V and drying time of 24&#xa0;h, the surface roughness Ra was reduced by 61.73% compared to the undried solution. Besides, the proportion of oxide products on the electropolished surface with undried and dried NaCl-EG was 86% and 98.87%, respectively. This proved that a more compact and uniform film generated on the surface with the dried solution. Furthermore, the response surface method was employed to further analyze the effect of polishing time, solution temperature and solution concentration on the surface roughness during the electropolishing process with a dried NaCl-EG solution. The results showed that the polishing time was the most significant factor. Finally, under the electropolishing with optimized parameters, the best surface roughness Ra was reduced to 0.399&#xa0;μm, which had a relative deviation of 6.39% to the predicted value.</p>

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Surface roughness improvement of selective laser melted Ti6Al4V using electropolishing with the dried NaCl-EG solution

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Xiaokang Yue,
  • Mingming Liu,
  • Tianyu Li,
  • Junsheng Zhang,
  • Shunhua Chen

摘要

The poor surface quality of selectively laser melted Ti6Al4V limited its application in critical fields. When using the solution with the solvent of ethylene glycol, electropolishing (EP) is an environmentally friendly method to improve surface roughness. However, the influence of the water absorption property of ethylene glycol on the surface roughness is rarely reported. In this study, polarization curve tests indicated that the solution with a suitable drying time had a better passivation ability than the undried solution. After EP with a voltage of 18 V and drying time of 24 h, the surface roughness Ra was reduced by 61.73% compared to the undried solution. Besides, the proportion of oxide products on the electropolished surface with undried and dried NaCl-EG was 86% and 98.87%, respectively. This proved that a more compact and uniform film generated on the surface with the dried solution. Furthermore, the response surface method was employed to further analyze the effect of polishing time, solution temperature and solution concentration on the surface roughness during the electropolishing process with a dried NaCl-EG solution. The results showed that the polishing time was the most significant factor. Finally, under the electropolishing with optimized parameters, the best surface roughness Ra was reduced to 0.399 μm, which had a relative deviation of 6.39% to the predicted value.