环保型硬铬镀层的显微硬度研究  

Study on Microhardness of Eco-friendly Hard Chromium Coatings

作　　者：崔楠[1] 吴扬[2] 张颖[3] CUI Nan;WU Yang;ZHANG Ying(Department of Mechanical and Electrical Engineering,Tangshan Vocational and Technical College,Tangshan 063000,China;Department of Agriculture and Forestry Engineering,Tangshan Vocational and Technical College,Tangshan 063000,China;College of Environmental Energy,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]唐山职业技术学院机电工程系,河北唐山063000 [2]唐山职业技术学院农林工程系,河北唐山063000 [3]北京工业大学环能学院,北京100124

出　　处：《电镀与环保》2019年第6期4-6,共3页Electroplating & Pollution Control

摘　　要：在环保型三价铬镀液中电镀硬铬,并研究了温度、脉冲频率、平均电流密度和占空比对硬铬镀层显微硬度的影响。结果表明:硬铬镀层的显微硬度随温度的升高变化不大,随脉冲频率的提高和平均电流密度的增加先增大后减小,随占空比的增加逐渐增大。当温度为50℃、脉冲频率为3 kHz、平均电流密度为30 A/dm^2、占空比为60%时,可以获得具有纳米晶结构的硬铬镀层。该镀层为体心立方结构,平均晶粒尺寸约为42.7 nm,显微硬度达到8 230 MPa。Hard chromium coatings were electroplated from eco-friendly trivalent chromium bath, and the influences of temperature, pulse frequency, average current density and duty cycle on the microhardness of hard chromium coating were investigated. The results showed that the microhardness of hard chromium coating changed little with the rise of temperature, increased first and then decreased with the increase of pulse frequency and average current density, and increased gradually with the increase of duty cycle. When temperature was 50 ℃, pulse frequency was 3 kHz, average current density was 30 A/dm^2 and duty cycle was 60%, a nanocrystalline hard chromium coating can be obtained. The coating was body-centered cubic structure, the average grain size was about 42.7 nm and the microhardness reached 8 230 MPa.

关 键 词：硬铬镀层 显微硬度 环保型三价铬 组织结构 

分 类 号：TQ153[化学工程—电化学工业]