摘要
为提高汽车零件冲压模具用导柱表面的耐磨性能,在导柱基材20Cr钢表面电沉积Ni-SiO_2纳米复合镀层。利用扫描电镜、能谱仪和透射电镜观察分析复合镀层的表面形貌、元素组成和显微组织,并利用显微硬度计和摩擦磨损试验机检测纳米复合镀层的硬度和耐磨性能。结果表明:纳米复合镀层的形貌质量较好,组织致密,平均晶粒尺寸为(50~100)nm;主要含Ni、Si、O等元素,其中SiO_2的质量分数约为7.8%;平均硬度约为660HV,是20Cr钢的1.1倍;耐磨性能优于20Cr钢,平均摩擦因数约为0.4,是20Cr钢平均摩擦因数的3/4。纳米复合镀层能够为20Cr钢提供有效的表面磨损防护,将纳米复合镀层用在汽车零件冲压模具用导柱上可提高导柱表面的耐磨性能。
In order to improve the surface wear resistance of guide pillar of stamping die for automobile parts,Ni-SiO2 nanocomposite coating was electrodeposited on the surface of 20 Cr steel guide pillar. The surface morphology,element composition and microstructure of nano-composite coating were observed and analyzed by using scanning electron microscope,energy-dispersive spectrometer and transmission electron microscope. The hardness and wear resistance of nano-composite coating were tested by using microhardness measuring instrument and friction and wear testing machine. Results show that the nano-composite coating has better morphology and compact structure,the average grain size is（50-100）nm. It is mainly composed of Ni,Si and O,the mass fraction SiO2 is about 7.8%. The average hardness is about 660 HV,which is 1.1 times the hardness of 20 Cr steel.The wear resistance of nano-composite coating is better than that of 20 Cr steel,the average friction coefficient is about 0.4,which is three fourths of the average friction coefficient of 20 Cr steel. Nano-composite coating can offer effective surface wear protection for 20 Cr steel,and the surface wear resistance of guide pillar of stamping die for automobile parts is improved by nanocomposite coating.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2017年第6期66-69,共4页
Ordnance Material Science and Engineering
基金
陕西省科学技术研究发展计划项目(2016GY-157)
