摘要
[目的]搅拌是影响复合电沉积过程的关键因素,搅拌速率的控制对于调节复合镀层的结构和提高其耐磨性具有重要意义。[方法]通过阴极极化曲线和电化学阻抗谱测试,分析了搅拌速率对Co-Cr_(3)C_(2)复合电沉积过程的影响,考察了不同搅拌速率下所得Co-Cr_(3)C_(2)复合镀层的微观结构、Cr_(3)C_(2)颗粒复合量及耐磨性。[结果]搅拌速率较低(如270 r/min)时,镀液中Cr_(3)C_(2)颗粒传输效率不高,导致阴极表面Cr_(3)C_(2)颗粒较少,阴极极化作用较弱。搅拌速率为320~380 r/min时,Co-Cr_(3)C_(2)复合电沉积过程表现出较强的阴极极化作用和较低的双电层电容,有利于Cr_(3)C_(2)颗粒在阴极表面的吸附及其在镀层中复合量的增加。然而搅拌速率过高会导致镀层中颗粒复合量减少。搅拌速率为320 r/min时,Co-Cr_(3)C_(2)镀层的颗粒复合量最高,耐磨性最佳。[结论]搅拌主要通过促进颗粒输送和对电极表面颗粒的冲刷作用来影响电化学极化和镀层的颗粒复合量,进而改变镀层的耐磨性。
[Introduction]Stirring rate is one of the critical factors during composite electrodeposition,and its control is essential for structure regulation and wear resistance enhancement of composite coating.[Method]The effect of stirring rate on electrodeposition of Co-Cr_(3)C_(2)composite were studied by cathodic polarization curve measurement and electrochemical impedance spectroscopy(EIS).The microstructure,Cr_(3)C_(2)content,and wear resistance of Co-Cr_(3)C_(2)composite coatings prepared at different stirring rates were examined.[Result]The Cr_(3)C_(2)particles in electrolyte were not transported efficiently at a low stirring rate(such as 270 r/min),resulting in few Cr_(3)C_(2)particles adsorbed onto the cathode surface and weak cathodic polarization during electrodeposition.When the stirring rate was 320-380 r/min,the electrodeposition of Co-Cr_(3)C_(2)composite showed strong cathodic polarization and low double-layer capacitance,facilitating the adsorption of particles onto cathode surface and the increase of Cr_(3)C_(2)content in coating.However,too high stirring rate led to a decrease in the Cr_(3)C_(2)content of coating.The Co-Cr_(3)C_(2)composite coating electrodeposited at a stirring rate of 320 r/min featured the highest content of Cr_(3)C_(2)particles and the best wear resistance.[Conclusion]Stirring significantly affects the electrochemical polarization and particle content in coating by promoting particle transport and flushing particles retained on the cathode surface during electrodeposition,and influencing the wear resistance of coating further.
作者
刘树静
汪镇涛
陈翀宇
卓健飞
何雨波
王帅星
杜楠
LIU Shujing;WANG Zhentao;CHEN Chongyu;ZHUO Jianfei;HE Yubo;WANG Shuaixing;DU Nan(Science and Technology College,Nanchang Hangkong University,Gongqingcheng 332020,China;School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;AECC Changjiang Engine Company Ltd.,Yueyang 414001,China)
出处
《电镀与涂饰》
CAS
北大核心
2024年第9期26-33,共8页
Electroplating & Finishing
基金
中国航空发动机集团产学研合作项目(HFZL2020CXY026)。
关键词
复合电沉积
钴
碳化铬
搅拌速率
微观结构
耐磨性
复合量
composite electrodeposition
cobalt
chromium carbide
stirring rate
microstructure
wear resistance
composite amount
