化学镀镍磷合金复合加速剂的研究

Study on composite accelerator for electroless nickel-phosphorus alloy plating

为了提高化学镀Ni–P合金的沉积速率,采用正交试验法研究了以乳酸为配位剂的复合加速剂。通过测定镀速、镀液稳定性、镀层孔隙率及耐盐雾腐蚀性能,得出最佳的复合加速剂配方为:20mL/L乳酸+8g/L丁二酸+3mL/L有机酸加速剂+4g/L钠盐加速剂。采用此复合加速剂,镀速达32μm/h,镀液在PdCl2加速试验中的稳定时间为7.49h,镀层孔隙率为0.09个/cm2,耐盐雾腐蚀时间达925h。

A composite accelerator with lactic acid as complexing agent was studied through orthogonal test to improve the deposition rate of NiP alloy by electroless plating. The optimal formulation of the composite accelerator was obtained based on the testing of plating rate, bath stability, coating porosity and salt spray corrosion resistance： 20 mL/L lactic acid, 8 g/L succinic acid, 3 mL/L organic acid accelerator and 4 g/L sodium salt accelerator. A plating rate of 32 μm/h, bath stability of 7.49 h in PdCl2 accelerating test, porosity of 0.09 pore/cm^2 and salt spray corrosion resistance of 925 h can be achieved by using the composite accelerator.