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通过设计中间过渡层,缩小AZ91D镁合金与沉积层镍之间的电位差,并以碱性锡酸盐镀液代替对人体和环境均有害的氰化物镀液,配合超声波作用,在AZ91D镁合金表面获得了电沉积镍层。利用SEM观察沉积层表面微观形貌,XRD、XPS对各处理层进行相组成检测。分析了锡酸盐镀液代替氰化物镀液对沉积层质量的影响,超声波对各沉积层沉积过程的影响以及对沉积层组织的细化作用。结果表明:碱性锡酸盐的使用提高了镀液的pH值,与酸性镀液相比较,减缓了镁合金在镀液中的腐蚀速率,为电沉积镍层在其表面的获得奠定了良好基础;各沉积层获得过程中,超声波的使用明显细化了各沉积层的组织,提高了其致密性,镀层的择优取向和耐腐蚀性能也得到改善。
By designing the middle transition layer, the potential difference between the AZ91D magnesium alloy and the deposited layer of nickel is narrowed, and the alkaline stannate bath is used instead of the cyanide bath harmful to the human body and the environment. In combination with the ultrasonic action, the AZ91D magnesium alloy Electrodeposited nickel layer was obtained on the surface. The microstructure of the deposited layer was observed by SEM, and the phase composition of each layer was tested by XRD and XPS. The influence of the stannate plating bath instead of the cyanide bath on the quality of the deposited layer, the influence of the ultrasonic wave on the deposition process of the deposited layer, and the refinement of the deposited layer structure were analyzed. The results showed that the use of alkaline stannate increased the pH value of the plating solution. Compared with the acidic plating solution, the corrosion rate of the magnesium alloy in the plating solution was slowed down, which laid a good foundation for the electrodeposited nickel layer on its surface Basis; the deposition process, the use of ultrasound significantly refined the structure of each deposited layer to improve its compactness, the preferred orientation of the coating and corrosion resistance has also been improved.