摘要
在Q235碳钢表面先预浸镀铜,然后采用超声-电沉积方法获得Cu-SiC纳米复合镀层。研究了纳米SiC含量对纳米复合镀层表面形貌的影响,讨论了阴极电流密度、超声功率、温度和电沉积时间对复合镀层显微硬度的影响,获得了较佳的工艺条件:镀液中SiC纳米颗粒含量9g/L,阴极电流密度6A/dm2,超声波功率200W,镀液温度30°C,电沉积时间40min。在此条件下制备Cu-SiC纳米复合镀层,测试了镀层的结合力,并与普通铜镀层进行比较,研究了复合镀层的表面形貌、显微硬度以及在3.5%NaCl溶液中的电化学阻抗谱(EIS)。结果表明,所制备的复合镀层结合力良好,其表面颗粒尺寸在0.5～1.0μm之间(小于普通铜镀层的1～4μm),显微硬度和反应电阻分别为294.6HV和2446.5.cm2(大于普通铜镀层的162.0HV和1538.7.cm2)。Cu-SiC纳米复合镀层具有较好的机械性能和耐腐蚀性能。
A Cu-SiC nanocomposite coating was prepared by ultrasonic-assisted electrodeposition on the surface of Q235 carbon steel previously treated by dip plating of copper The effect of nano-SiC content on surface morphology of the composite deposit was studied. The influence of the cathodic current density, ultrasonic power, bath temperature, and electrodeposition time on microhardness of Cu-SiC composite coating were discussed. The good process conditions were obtained as follows： the content of SiC nano particles in bath 9 g/L, cathodic current density 6 A/dm2, ultrasonic power 200 W, bath temperature 30 ℃, and electrodeposition time 40 min. The adhesion strength of the Cu-SiC nanocomposite coating obtained under the above conditions was tested. The surface morphology, microhardness, and electrochemical impedance behavior in3.5% NaCl solution of Cu-SiC composite coating were compared with a common Cu coating. The results showed that the prepared composite coating features good adhesion strength, surface particle size range of 0.5-1.0 lam （smaller than that of the common copper coating 1-4 μm）, as well as microhardness 294.6 HV and reaction resistance 2 446.5 Ω.cm2 （both larger than 162.0 HV and 1 538.7Ω.cm2 of the common copper coating）. The Cu-SiC nanocomposite coating has better mechanical properties and corrosion resistance.
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2013年第4期9-13,共5页
Electroplating & Finishing
关键词
铜
碳化硅
纳米复合镀层
电沉积
超声波
copper
silicon carbide
nanocomposite coating
electrodeposition
ultrasonic
