不对称交流-直流电镀Fe-纳米ZrO2复合镀层工艺的研究

为提高镀铁层的硬度及耐磨性能,采用氯化物低温镀铁工艺,选择纳米ZrO2作为第二相粒子,以不对称交流-直流电源电镀法制备了Fe-纳米ZrO2复合镀层.研究了不对称交流-直流镀铁工艺对镀层的影响,考察了工艺参数对镀层中ZrO2复合量的影响以及表面活性剂对镀层性能的影响.结果表明,采用不对称交流-直流电镀方法可获得内应力小、光滑致密的复合镀层,有效降低镀层裂纹的产生;通过控制工艺参数可调节镀层中ZrO2纳米粒子的复合量;在镀液中加入阴离子型表面活性剂十二烷基硫酸钠可降低纳米粒子的团聚,获得最佳的镀层综合性能.

Study of Asymmetric AC-DC Electroplating Process for Fe/Nano-ZrO2 Composite Coating

In order to increase the hardness and wear resistance of electroplated iron coating,low temperature iron plating in a chloride bath using asymmetric AC-DC electroplating technology was used to prepare Fe/nano-ZrO2 composite coating,with nano-ZrO2 being the second phase particiulates.The influences of the asymmetric AC-DC iron electroplating technology and surfactant on the composition and properties of the Fe/nano-ZrO2 composite coatings were investigated.Results indicated that smooth and compact Fe/nano-ZrO2 composite coatings with small internal stress and little microcrack could be prepared via asymmetric AC-DC electroplating at a relatively low temperature.The content of nano-ZrO2 in the composite coating could be well controlled by properly adjusting the electroplating parameters.At the same time,the introduction of the anionic surfactant sodium dodecyl sulfate helped to retard the aggregation of the nano-ZrO2 particulates in the plating bath,which could be helpful to retaining the optimized properties of the Fe/nano-ZrO2 composite coating.