(1. 國網(wǎng)浙江省電力公司 電力科學(xué)研究院, 杭州 310014;
2. 南昌航空大學(xué) 材料科學(xué)與工程學(xué)院，南昌 330063)
摘 要: 在測定Ni-金剛石復(fù)合電沉積體系陰極極化曲線、電化學(xué)阻抗譜及微分電容曲線等基礎(chǔ)上，分析了溫度對界面雙電層的影響規(guī)律，推斷出金剛石微粒復(fù)合量隨溫度升高的變化趨勢，以此探討溫度在Ni-金剛石復(fù)合電沉積中的電化學(xué)行為。結(jié)果表明：隨鍍液溫度沿30 ℃→40 ℃→60℃升高，Ni-金剛石復(fù)合體系的陰極極化減小，法拉第電阻沿17.3 ？→5.2 ？→3.0 ？降低，雙電層電容沿40.8 μF→141.2 μF→175.6 μF增加，同時(shí)，陰極表面在析出電位附近的負(fù)電荷密度逐漸增加。電化學(xué)測試結(jié)果表明：金剛石微粒復(fù)合量將隨溫度的升高而降低，且工藝實(shí)驗(yàn)與電化學(xué)測試結(jié)果也映證這一點(diǎn)。
關(guān)鍵字: Ni-金剛石；復(fù)合電沉積；電化學(xué)行為；陰極極化曲線；電化學(xué)阻抗譜
（1. Electric Power Research Institute, State Grid Zhejiang Electric Power Company, Hangzhou 310014, China;
2. Institute of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China）
Abstract:Based on the study about cathodic potentiodynamic diagrams, electrochemical impedance diagrams and differential capacitance curves, the effect of temperature on diffuse double layer was analyzed, and then the change of particle content in the deposits along with temperature was judged. And the electrochemical action of temperature in Ni-diamond composite electrodeposition was discussed. The results show that, with temperature increasing from 30 ℃, 40 ℃ to 60 ℃, the cathodic potentiodynamic of composite system decreases. At the same time, Faraday resistance decreases from17.3 ？, 5.2 ？ to 3.0 ？, the electric double layer capacitance increases from 40.8 μF, 141.2 μF to 175.6 μF. The negative charge density on cathodic surface increases near deposition potential. The electrochemistry testing experiment data indicate that the content of particles in the deposits decreases with the increase of temperature. The technics experiment confirms it well.
Key words: Ni-diamond; composite electrodeposition; electrochemical behavior; cathodic potentiodynamic diagram; electrochemical impedance diagram
