柔性摩擦辅助电镀致密铬镀层的工艺研究  

Study on process of flexible friction-assisted electroplating of compact chromium coatings

作　　者：邓云[1] 吕镖[1] 汪笑鹤[2] 胡振峰[1] 梁秀兵[1] DENG Yun LYU Biao WANG Xiao-he HU Zhen-feng LIANG Xiu-bing

机构地区：[1]装甲兵工程学院机械产品再制造国家工程研究中心,北京100072 [2]中国华阴兵器试验中心,陕西华阴714200

出　　处：《电镀与涂饰》2016年第19期1021-1024,共4页Electroplating & Finishing

基　　金：国家自然科学基金(51505484)

摘　　要：采用柔性摩擦辅助电镀铬技术制备了铬镀层，以解决飞机起落架缓冲器活塞杆硬铬镀层气密性差的问题。镀液组成为：CrO3 220-300g/L，H2SO4 2．2-3．0g／L，Cr^3＋2．5-7．5g/L，添加剂HF-046-8mL／L。通过观察不同工艺条件下所得铬镀层的表面形貌，研究了工件转速、温度和电流密度对柔性摩擦辅助电镀铬层性能的影响。最优温度、工件转速和电流密度分别为65℃、20r／min和40A／dm^2。在最优条件下所得硬铬镀层几乎没有裂纹，表面平整、致密，显微硬度约为850HV，气密性合格。Chromium coatings were prepared by flexible friction-assisted chromium electroplating in order to solve the problem of poor air tightness of hard chromium coating on aircraft landing buffer piston rod. The bath composition are as follows： CrO3 220-300 g/L, H2SO4 2.2-3.0 g/L, Cr^3＋ 2.5-7.5 g/L, additive HF-04 6-8 mL/L. Effect of temperature, rotation speed of workpiece and current density on property of flexible friction-assisted chromium electroplated coatings were studied by observing the surface morphology of coatings obtained under different conditions. The optimal temperature, rotation speed of workpiece and current density is 65℃, 20 r/min and 40 A/dm^2 respectively. The hard chromium coating obtained under the optimum condition has little micro-crack, a smooth and compact surface, a microhardness of 850 HV and qualified air tightness.

关 键 词：铬 电镀 柔性摩擦 表面形貌 裂纹 气密性 

分 类 号：TQ153.11[化学工程—电化学工业]