AZ91D镁合金低温快速化学镀Ni-P工艺的研究
Study on Rapid Electroless Ni-P Coating on AZ91D Magnesium Alloy at Low-temperature
冒国兵, 余小鲁, 陈志浩, 邢 昌
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作者单位：(安徽工程大学 机械与汽车工程学院 安徽高性能有色金属材料省级实验室, 安徽 芜湖 241000)
中文关键字：化学镀； Ni-P镀层； AZ91D镁合金； 添加剂
英文关键字：electroless plating; Ni-P coating; AZ91D magnesium alloy; accelerator
中文摘要：采用化学镀方法，在AZ91D镁合金上沉积Ni-P镀层，研究了添加剂对镀层的影响。结果表明：未加添加剂时，沉积速度慢；加入添加剂后，镀层的沉积速度增加，65 ℃时只需30 min就可获得无气孔或裂纹、具有“菜花状”结构的均匀完整的Ni-P镀层。XRD测试结果表明，沉积的Ni-P镀层为非晶态。镀层的耐蚀性实验结果表明，化学镀 Ni-P镀层后，AZ91D镁合金的耐蚀性优于基体。
英文摘要：The Ni-P coating was deposited on AZ91D magnesium alloy by electroless plating process without or with accelerators. The results show that: without accelerators, the deposition rate is slow. After adding the accelerator, the uniform, defect free, with no pores or cracks, “cauliflower-like” structure and complete Ni-P coating is deposited at 65 ℃ for 30 min. The XRD result indicates that the structure of the Ni-P coating is amorphous nickel. The Tafel polarization curves for corrosion studies of coated magnesium alloys were performed in a corrosive environment of 3.5wt%NaCl. The result reveals that compared with the substrate, the corrosion resistance of the coated AZ91D magnesium alloys increases distinctly.