钛合金表面化学镀Ni-P-MoS_2耐磨性能研究

Wear Resistance of Electroless Ni-P-MoS_2 Coating on TC4 Titanium Alloy

以TC4钛合金为基体制备出Ni-P-MoS2化学复合镀层,分析了pH值、MoS2微粒浓度以及表面活性剂种类、浓度对复合镀层耐磨性能的影响,并观察了镀层磨损后的形貌。结果表明:复合镀层的耐磨性随镀液中MoS2颗粒浓度和pH值的升高先增强后减小。在MoS2颗粒浓度为2g/L和pH为6.0时,阳离子表面活性剂十六烷基三甲基溴化铵与阴离子表面活性剂十二烷基硫酸钠的共同作用能有效促进MoS2微粒与Ni-P合金的共沉积,在钛合金表面形成一层均匀的固体润滑膜,显著降低摩擦系数。镀层中MoS2粒子起到很好的固体自润滑作用,减小了粘着磨损的发生。

In this paper,TC4 titanium alloy was used as substrate,and electroless Ni-P-MoS2 composite coatings were obtained successfully on its surface. The influences of pH,MoS2 concentration on the composite coating were discussed. Furthermore,the coating morphology after the wear test was observed. The results show that the wear resistance of composite coating increased first and then decreased with the increase of MoS2 particles concentration in the bath and pH. When the MoS2 concentration is 2 g /L and the pH is 6. 0,the combined action of cationic surfactant-hexadecyl trimethyl ammonium bromide( CTMAB) and anionic surfactant-sodium dodecyl sulfate( SDS) can promote the co-deposition of MoS2 particles and Ni-P alloy and the formation of uniform solid lubricating film on titanium alloy surface,therefore leading to the marked decrease of friction coefficient. MoS2 particles can bring good solid self lubricating effect on the surface of coating and lessen the occurrence of the adhesive wear.