目的 研究磁流体的极性对钛合金光滑表面和织构表面摩擦学性能的影响。方法 以水基磁流体、煤油基磁流体、去离子水和煤油为润滑剂，在UMT?3摩擦磨损试验机上分别进行钛合金光滑表面和织构表面的摩擦磨损实验，得到极性不同的磁性颗粒对不同表面的摩擦因数、磨损量和磨损形貌的影响规律。结果 在光滑钛合金表面，极性磁性颗粒使得摩擦因数下降了8.42%，磨痕宽度下降了8.47%，磨损方式由严重的磨粒磨损和黏着磨损转变为轻微的磨粒磨损。非极性磁性颗粒使得摩擦因数上升了33.94%，磨痕宽度上升了42.20%，磨损方式由轻微的黏着磨损转变为严重的磨粒磨损。在织构表面，极性磁性颗粒的减摩作用进一步增强，而非极性磁性颗粒并没有明显的减摩作用。结论 采用不同极性磁流体润滑时，极性磁性颗粒更容易吸附在钛合金表面，从而增加油膜的厚度和刚度，减小其摩擦因数。

The paper aims to study the effect of magnetic fluid polarity on the tribological properties of smooth and textured surface of titanium alloy. The friction and wear experiments of smooth and textured surfaces of titanium alloy are carried out on UMT-3 friction and wear tester with water-based ferrofluid, kerosene-based ferrofluid, deionized water and kerosene as lubricants. The effects of magnetic particles with different polarity on friction coefficient, wear amount and wear morphology of different surfaces are obtained. The results show that:on the smooth surface of titanium alloy, the friction coefficient decreases by 8.42% and the wear scar width decreases by 8.47%. The non-polar magnetic particles increase the friction coefficient by 33.94% and the wear scar width by 42.20%. The wear mode changes from slight adhesive wear to severe abrasive wear. On the textured surface, the friction reducing effect of polar magnetic particles is further enhanced, while that of non-polar magnetic particles is not obvious. When lubricated by different polarity magnetic fluid, the polar magnetic particles will be more easily adsorbed on the surface of titanium alloy, thus increasing the thickness and stiffness of oil film and reducing the friction coefficient.