Ni-Co-B合金电镀工艺优化及镀层耐蚀性研究

Study on Optimization of Electroplating Process and Corrosion Resistance of Ni-Co-B Alloy Coating

采用复合电镀工艺在碳钢试片表面制备了耐蚀性优良的Ni-Co-B合金镀层,通过正交试验对电镀工艺条件进行优化,得到的最佳合金电镀工艺为:硫酸镍180 g·L^(-1)、硫酸钴60 g·L^(-1)、四硼酸钠3 g·L^(-1)、硼酸30 g·L^(-1)、氯化铵25 g·L^(-1)、十二烷基硫酸钠3 g·L^(-1)、糖精钠2 g·L^(-1)、温度50℃、p H为5.0、电流密度8 A·dm-2、时间40 min。在最佳工艺条件下,所得的Ni-Co-B合金镀层的耐蚀性优于工艺优化前的镀层。

Through composite electroplating process,Ni-Co-B alloy coating with excellent corrosion resistance was prepared on the surface of carbon steel specimens,the electroplating process condition was optimized through orthogonal test to get the best alloy plating process as follows:nickel sulfate 180 g·L^(-1),sulfuric acid cobalt 60 g·L^(-1),sodium tetraborate 3 g·L^(-1),boric acid 30 g·L^(-1),ammonium chloride 25 g·L^(-1),sodium dodecyl sulfate 3 g·L^(-1),sodium saccharin 2 g·L^(-1),temperature 50℃,pH=5.0,current density 8 A·dm-2,time 40 min.The corrosion resistance of the Ni-Co-B alloy coating was better than that before the process optimization.