表面技术Issue(5)：53-57,82,6.DOI:10.16490/j.cnki.issn.1001-3660.2015.05.010
超声条件下脉冲电镀Ni-纳米Al2 O3复合镀层及其显微硬度研究
Research on Microhardness of Ni-Nano Al2 O3 Composite Coatings Prepared by Pulse Electroplating under Ultrasound Condition
摘要
Abstract
Objective To optimize pulse parameters in order to prepare the composite coating with high microhardness. Methods Ni-nano Al2 O3 composite coatings were prepared by pulse electroplating under ultrasound condition, and the influences of average current density, duty cycle, frequency and electroplating time on the microhardness were also investigated. Results The microhard-ness of Ni-nano Al2 O3 composite coatings increased first and then decreased with the increase of average current density, duty cycle and frequency, and it tended to decrease approximately with the electroplating time prolonging. Conclusion The Ni-nano Al2 O3 composite coating prepared under the condition of average current density 8 A/dm2 , duty cycle 0. 6, frequency 1. 5 kHz and elec-troplating time 3 min had the highest microhardness of about 427. 1HV. It was concluded that nano Al2 O3 particles of high compos-ite quantity had effects of dispersion strengthening and grain refinement strengthening and improved the density of composite coating structure, thus improving microhardness.关键词
显微硬度/Ni-纳米Al2 O3 复合镀层/平均电流密度/占空比/频率/施镀时间Key words
microhardness/Ni-nano Al2 O3 composite coating/average current density/duty cycle/frequency/electroplating time分类
化学化工引用本文复制引用
周言敏,李建芳..超声条件下脉冲电镀Ni-纳米Al2 O3复合镀层及其显微硬度研究[J].表面技术,2015,(5):53-57,82,6.
