汽车活塞销镀Ni-Co合金镀层表面改性及性能研究

摘要

利用电镀技术,在汽车活塞销表面制备Ni-Co合金镀层实现表面改性.概述了活塞销表面改性的工艺过程,观察了表面改性后活塞销的形貌,检测了Ni-Co合金镀层与活塞销基体的结合强度以及表面改性后活塞销的硬度、抗拉强度及耐摩擦磨损性能.结果表明,Ni-Co合金镀层与活塞销基体结合牢固,表面改性后活塞销的表面平整均匀,硬度和抗拉强度均提高,表现出较好的耐摩擦磨损性能.Ni-Co合金镀层有效改善了活塞销的表面状况,使活塞销的硬度提高约17％,抗拉强度提高约7.2％,磨损量和磨损速率分别下降17.5％和17.9％.%For the sake of realizing surface modification,Ni-Co alloy coating was prepared on automobile piston pin surface by electroplating.Process of the surface modification was elaborated,surface morphology of the piston pin after surface modification was observed by utilizing instruments and equipments,bonding strength between the Ni-Co alloy coating and piston pin substrate,hardness,tensile strength as well as friction wearing performance of the piston pin after surface modification were also tested.Results showed that the Ni-Co alloy coating combined firmly with the piston pin substrate,the piston pin surface after modification was smooth and uniform,presented higher hardness,higher tensile strength and better friction wearing performance.The Ni-Co alloy coating had effectively improved the surface status of the piston pin,which made hardness increased by 17％,tensile strength increased by 7.2％,wearing mass loss and wearing rate decreased by 17.5％ and 17.9％,respectively.