摘要
为了探讨钛合金表面Ni-P化学镀层中磷含量对镀层组构、耐磨性及机理的影响,在TC4钛合金表面制备了不同磷含量的Ni-P化学镀层。借助扫描电镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)观察了Ni-P化学镀层的形貌和组织结构,测试了其硬度、磨损量和摩擦系数;探讨了Ni-P化学镀层中磷含量对镀层硬度和耐磨性的影响,初步分析了磨损机理。结果表明:随着Ni-P化学镀层中磷含量的增加,镀层的瘤状结构和晶界逐渐减少,晶粒尺度逐渐增大,并由晶态向非晶态转变;镀层的硬度降低,磨损量增加,摩擦系数降低;低磷Ni-P化学镀层表现出磨料磨损和轻微的黏着磨损特征,中磷和高磷Ni-P化学镀层表现出严重的黏着磨损和磨料磨损特征。
Ni-P alloy coatings with different P contents were successfully prepared on the surface of TC4 titanium alloy by making use of electroless plating technology.The morphology and microstructure of as-prepared Ni-P alloy coatings were analyzed by scanning electron microscopy,energy dispersive spectrometry and X-ray diffraction.Furthermore,the hardness as well as wear mass loss and friction coefficient of as-prepared Ni-P alloy coatings was measured in relation to the effect of P content,and the wear mechanism of the alloy coatings was discussed.It was found that the amount of hump-like structure and grain boundary of Ni-P coatings gradually decreased with increasing P content,and the size of the grains gradually increased therewith,which was accompanied by crystal to amorphous transformation.Besides,the hardness and friction coefficient of the alloy coatings declined with increasing P content,and their wear mass loss rose therewith.In the meantime,as-prepared electroless Ni-P coatings with low P contents were dominated by abrasive wear and mild adhesion wear,while those with moderate and high P contents were dominated by severe adhesion wear and abrasive wear.
出处
《材料保护》
CAS
CSCD
北大核心
2013年第1期5-7,共3页
Materials Protection
基金
航空科学基金(2012ZE56015)
轻合金加工科学与技术国防重点学科实验室开放基金(gf201001002)资助
关键词
化学镀Ni—P
TC4钛合金
镀层磷含量
镀层组构
镀层形貌
耐磨性
electroless Ni-P alloy coatings
TC4 titanium alloy
phosphorus content
microstructure
morphology
wear resistance
