Lingzhong DU
,
Binshi XU
,
Shiyun DONG
,
Xin LI
,
Hua YANG
,
Weiyi TU
,
Zixin ZHU
材料科学技术（英文）
Ni-matrix composite coating containing Al2O3 nano-particles is prepared by brush plating. The effects of the nano-particles on the microstructure, microhardness and tribological properties of the composite coating under the lubrication of a diesel oil containing sand are investigated. The results show that the microstructure of the composite coating is finer than that of the pure nickel coating due to the codeposition of the nano-particles. When the nano-particle concentration in the electroplating bath reaches 20 g/L, the microhardness, and wear resistance of the composite coating is as much as 1.6 times and 1.3～2.5 times of those of the pure nickel coating respectively. The main hardening mechanism of the composite coating is superfine crystal grain strengthening and dispersion strengthening. The composite coating is characterized by scuffing as it slides against Si3N4 under the present test conditions.
关键词:
Brush plating
,
null
,
null
,
null
罗建东
,
曾德长
,
张弢
表面技术
doi:10.3969/j.issn.1001-3660.2009.06.002
以目前应用最广泛的刷镀镀层之一--镍-磷镀层为对象,利用自制多功能刷镀电源、原子力显微镜等设备,测得了刷镀时间与刷镀电流之间的关系,通过数据处理求得了二者之间的函数关系,在此基础上进一步求得了电流密度(刷镀电流/刷镀面积)与刷镀时间之间的函数关系;利用原子力显微镜测得镀层界面处、接近界面处和远离界面处的镀层颗粒形貌,结合刷镀电流密度与刷镀时间之间的关系,建立了刷镀镀层生长的模型.模型具有重要的指导意义:根据所建立的模型可以控制镀层颗粒的大小,改善镀层质量,为实际生产提供参考和指导.
关键词:
刷镀
,
镍-磷镀层
,
生长机理
,
镀层模型
