溶液组分对电铸镍组织和力学性能的影响

Influence of Bath Composition on Microstructure and Mechanical Properties of Electroformed Nickel

在氨基磺酸盐溶液体系中电铸获得综合性能优异的铸镍层。利用金相显微镜、薄片阴极弯曲法和万能拉伸试验机评价测试溶液组分氨基磺酸镍和氯化镍对铸镍层的微观组织结构、内应力和力学性能的影响。结果表明:溶液经净化处理后,随着体系中氨基磺酸镍含量的逐渐增大,铸镍层的柱状组织越来越粗大,内应力和抗拉强度逐渐减小,而相应的伸长率则呈逐渐增大的趋势;随着体系中氯化镍含量的不断增大,铸镍层的柱状组织先逐渐粗化后再逐渐细化,内应力逐渐增大,抗拉强度先降低后升高,而相应的伸长率逐渐减小;当体系中氨基磺酸镍为300g/L、氯化镍为3g/L时,铸镍层的综合性能优异,此时铸镍层的内应力为60.7MPa,抗拉强度为811.7MPa,伸长率为23.5%。

Nickel layer was successfully electroformed in sulphamate solution. The influence of bath composition on the microstructure, internal stress and tensile properties of electroformed nickel were studied by optical microscope, thin film flexural method and universal testing machine, respectively. The results show that, with the increase of the amount of nickel sulphamate, the gain size of the electro- formed nickel increases, the internal stress and tensile strength decrease, but elongation increases correspondingly. As the content of nickel chloride increases, the gain size of the electroformed nickel becomes coarse and then refined, and the internal stress increases. Besides, tensile strength decreases before increases, and elongation decreases correspondingly. When the compositions of nickel sul- phamate and nickel chloride are 300g/L and 3g/L, respectively, the comprehensive properties of nickel layer are good. And the inter- nal stress, tensile strength and elongation are 60.7MPa, 811.7MPa and 23.5% respectively.