目的 获得电沉积 Ni-Cr 泡沫合金的最佳工艺参数。 方法 采用正交实验法研究镀液成分等工艺参数对镀层沉积速率、厚度以及合金中 Cr 含量的影响,并利用扫描电子显微镜等测试手段对镀层横截面厚度等镀层指标进行了考察。 结果 阴极电流密度为 28 A / dm²,镀液 pH 值为 2 . 0 ,镀液温度为 25 ℃ ,CrCl₃ ·6 H₂O 的质量浓度为 125 g / L,配位剂与 Cr³⁺摩尔比为 1 . 8 时,电沉积 60 min 能够获得表面光亮平整的 Ni-Cr 合金镀层,镀层厚度为 24 . 09 μm,沉积速率为 0 . 4198 mg / ( cm²·min) ,镀层中 Cr 的质量分数为 14 . 76 % 。 结论 镀液温度在 25 ~ 40 ℃ 范围内,对 Ni-Cr 合金镀层厚度、沉积速率的影响最大;镀液中CrCl₃ ·6 H₂O 浓度、配位剂与 Cr³⁺的摩尔比两个因素,对合金镀层中 Cr 含量的影响较大。

Objective To obtain the optimal parameters during the electrodepositing of Ni-Cr foam alloy. Methods The main factors including the thickness, deposition rate and chrome content of the coating layer were explored by orthogonal design experiment. The coating indices for cross-section microstructure and surface morphologies were investigated by the test methods. Results A 24. 09 μm thick layer of uniform and bright coating was obtained with 14. 76 wt% of Cr at the deposition rate of 0. 4198 mg /( cm² ·min) in the solution of 125 g / L CrCl₃ ·6 H₂ O with a pH of 2. 0 and current density of 28 A / dm² at 25 ℃ for sixty minutes. Conclusion Temperature was the most important factor affecting the Ni-Cr alloy layer thickness and deposition rate in the range of 25 ~ 40 ℃ , and the concentration of CrCl₃ ·6 H₂O and complexant in plating solution were the most important factors affecting the chrome content of the coating layer.