镍-铁-磷/金刚石复合沉积工艺与性能研究

Technology for Electrodeposition of Ni-Fe-P/Diamond Composite Coating and Properties of the Composite Coating

以三元合金为基体的复合电沉积层综合了一般耐磨镀层的性能和所镶嵌的固体微粒的性能。为开发新型多元非晶态合金耐磨复合沉积层，以复合沉积层耐磨减摩性为主要衡量指标并综合考虑其他性能指标，用正交试验法进行了镍-铁-磷／金刚石复合电沉积工艺与性能的研究。结果表明，在试验所采用的复合电沉积工艺控制范围内，可获得金刚石微粒弥散分布的镍-铁-磷／金刚石复合电沉积层，通过调整沉积工艺参数，能得到不同金刚石微粒复合量的复合电沉积层；在镀态下该复合沉积层（基质）呈非晶态结构；较佳综合性能复合层的电沉积工艺参数为：镀液中金刚石微粒（0．5-1．0μm）含量6g／L；NaH2P02·H20含量2g／L；FeSO4-7H2O含量70g/L，其对制备具有良好摩擦学特性的镍-铁-磷／金刚石复合沉积层具有重要的参考价值。

Ternary alloy-based electroplated composite coatings doped with hard granules usually have good comprehensive properties,owing to the combination of the wear-resistant coatings and incorporated granules.This makes it feasible to develop novel wear-resistant composite coatings by introducing desired solid particulates into the plating bath for multi-element alloy plating.Thus orthogonal test was used to investigate the technology for the electrodeposition of Ni-Fe-P/diamond composite coating,with the friction and wear behaviors of the composite coatings to be considerably taken into account.Results showed that it was feasible to prepare the titled composite coating using the selected plating technology,and the ternary alloy matrix in the resulting as-deposited composite coating had amorphous structure.Moreover,the diamond particulates (grit size 0.5～1.0 μm) were uniformly distributed in the amorphous composite coating and the content of diamond therein could be adjusted by properly controlling the bath composition and plating parameters.The desired plating bath was suggested to be composed of 6 g/L diamond, 2 g/L NaH-2PO-2·H-2O,and 70 g/L FeSO-4·7H-2O.