本发明涉及一种激光增材制造钛合金工件的等离子抛光液及其制备和应用，属于金属表面处理技术领域。一种激光增材制造钛合金工件的等离子抛光液，其特征在于：所用等离子抛光液为水溶液，由下述组分组成：甲基磺酸500-750ml/L，NH₂SO₄1‑3g/L，磺基水杨酸1‑7ml/L，氯化钠5‑10g/L。本发明的等离子抛光液绿色环保，原材料易得，对加工环境无污染；进行等离子抛光时所需电压更低，有效的降低了生产的能耗，适应绿色制造的发展方向，因此有利于推广。使用此等离子抛光液对激光增材制造异形钛合金工件进行抛光，试样失重率较小，可以有效降低钛合金表面粗糙度，提高整体光泽度，得到高质量的钛合金工件表面。

The present invention relates to a plasma polishing solution for laser additive manufacturing of titanium alloy workpieces and its preparation and application, belonging to the field of metal surface treatment technology. A plasma polishing solution for laser additive manufacturing of titanium alloy workpieces, characterized in that the plasma polishing solution used is an aqueous solution composed of the following components: 500-750ml/L methylsulfonic acid, 1‑3g/L NH₂SO₄, 1-7ml/L sulfosalicylic acid, and 5-10g/L sodium chloride. The plasma polishing solution of the present invention is environmentally friendly, with readily available raw materials and no pollution to the processing environment; The required voltage for plasma polishing is lower, effectively reducing production energy consumption and adapting to the development direction of green manufacturing, which is beneficial for promotion. Using this plasma polishing solution to polish irregularly shaped titanium alloy workpieces produced by laser additive manufacturing has a low weight loss rate of the sample, which can effectively reduce the surface roughness of the titanium alloy, improve the overall glossiness, and obtain high-quality titanium alloy workpiece surfaces.