利用化学镀镍磷锡溶液和化学镀镍-磷溶液对连接器铝合金外壳进行施镀,摸索多元合金化学镀层在连接器上的应用.结果表明,连接器采用镍磷锡镀层在高磷化学镀镍的基础上耐蚀性有较大提升,镍磷锡镀层为非晶态.同时,镍磷锡镀层较镍磷镀层应力低,更加试用于翻铆或打标工艺.

To understand the effects of additives on the performance of a Ni-Co-P alloy electroplated coating, this study, based on a single-factor experiment, utilized a Box-Behnken experimental design to optimize an additive that can enhance the electrodeposited Ni-Co-P alloy coating's properties, including hardness, glossiness, and corrosion resistance. The study used tools such as a gloss meter, a Vickers hardness tester, and an electrochemical workstation to analyze the impact of different additives on the coating's hardness and gloss. The optimal additive combination was determined. The results from the Box-Behnken experiment showed that when the concentrations of sodium dodecyl sulfate, thiourea, and sodium allyl sulfonate reached 0.10, 0.15, and 0.22 g/L, respectively, the resulting coating hardness was 475.4 HV0.5, and the gloss level was 463.4 GU. Compared to the coatings without additives, the hardness increased by 90.34 HV0.5, and the glossiness rose by 101.2 GU. The coating's corrosion resistance also improved. This enhancement is attributed to the compounded additive, which significantly improved the surface morphology of the coating, making it smoother and more compact. The morphology and composition of the coatings with additives were analyzed through scanning electron microscopy and energy dispersive X-ray spectroscopy, and the composition of the coating contains 71.01 at % Ni, 20.65 at % Co, and 8.34 at % P. At the same time, the optimized coating exhibits a metallic luster similar to stainless steel, meeting industrial requirements.

某铝合金连接器在化学镀高磷Ni-P合金后剩磁不合格,通过分析镀层的元素组成和相结构得出是镀层中P含量分布不均所致.通过单因素试验和正交试验优化了化学镀Ni工艺,最终得到剩磁合格的产品.

以沉积速率、镀液的稳定性、复合镀层的孔隙率和显微硬度为评价指标,研究了碘酸钾和硫酸铜对化学镀Ni-P-纳米SiO2复合镀层的影响.结果 表明:单独使用碘酸钾作稳定剂时,碘酸钾适宜的质量浓度为60～80 mg/L;单独使用硫酸铜作稳定剂时,硫酸铜适宜的质量浓度为20～40mg/L;当80 mg/L碘酸钾与20 mg/L硫酸铜复配时,沉积速率最快,孔隙率较低,显微硬度最高.