【摘 要】
：
电刷镀纳米晶镀层的组织及其强化机理采用直流、脉冲和脉冲换向电流制备了Ni和n- SiO_2/Ni电刷镀镀层,利用SEM、AFM、TEM和XRD等技术对镀层的表面形貌、显微组织和晶粒尺寸等
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电刷镀纳米晶镀层的组织及其强化机理采用直流、脉冲和脉冲换向电流制备了Ni和n- SiO_2/Ni电刷镀镀层,利用SEM、AFM、TEM和XRD等技术对镀层的表面形貌、显微组织和晶粒尺寸等进行了分析测量。结果表明：电刷镀层表面呈胞状组织,镀层的晶粒尺寸均在纳米量级,说明电刷镀技术是一个古老而未被认识的纳米技术；复合电刷镀过程中纳米颗粒的作用及脉冲换向电流,能进一步提高镀层的形核率及抑制品粒的生长,从而减小纳米晶的尺寸。镀层的硬度与纳米晶的尺寸有很好的对应关系。
The structure and mechanism of nanocrystalline coating by brush plating were studied. Ni and n-SiO 2 / Ni brush plating coatings were prepared by direct current, pulse and pulse current reversal. The surface morphology of the coating was characterized by SEM, AFM, TEM and XRD. Appearance, microstructure and grain size were analyzed and measured. The results show that the surface of brush plating is cellular and the grain size of the coating is in the order of nanometers, which indicates that brush plating is an ancient and unknown nanotechnology. The role of nano-particles and pulsing Commutation current, can further improve the coating nucleation rate and inhibit the growth of grain, thereby reducing the size of nanocrystals. The hardness of the coating has a good correspondence with the size of the nanocrystal.
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