最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

Corrosion resistance of rare earth permanent magnet material NdFeB was achieved by electrodeposited Cu-graphene (Cu-GR) composite films. The impact of the films on corrosion performances was studied by examining the morphology, water contact angle, and surface microhardness. The results show that the hydrophobicity and the hardness are enhanced as the concentration of graphene in the plating solution increases from 0 g·L^-1 to 0.9 g·L^-1. The characterization through SEM/EDS and XPS verifies the uniform dispersion of graphene sheets in the electrodeposited coating and the composition of Cu-GR composites. The electrochemical performance of the Cu-GR composite coating was investigated by potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS), and it is demonstrated that the electrochemical performance becomes more stable and the corrosion resistance is improved with the addition of graphene in the composites. For the sintered NdFeB samples coated with Cu-GR composite films with different graphene concentrations the best protective effect is obtained for the film prepared from the plating solution with a graphene concentration of 0.3 g·L^-1.