采用高频(≥20 kHz)脉冲电镀法在不锈钢环上制备镍钴合金。研究了脉冲频率、占空比、镀液中硫酸钴的质量浓度、平均电流密度以及pH对Ni-Co合金镀层表面形貌和耐磨性的影响。与直流电镀所得Ni-Co合金镀层相比，高频脉冲电镀所得镀层的孔隙率较低，表面均匀、致密，耐磨性较好。Ni-Co合金镀层的耐磨性随脉冲频率升高或镀液中硫酸钴含量增大而显著增强，但随占空比或电流密度升高而变差。随镀液pH升高，镀层耐磨性呈先改善后变差的趋势。高频脉冲电镀制备 Ni-Co合金镀层的较佳工艺条件为：脉冲频率140 kHz，占空比0.20，平均电流密度2 A/dm2，镀液pH 3.5，温度55°C，时间40 min， CoSO4·7H2O 35 g/L。
Nickel cobalt alloy coatings were prepared on stainless steel rings by pulse plating at high frequencies (≥20 kHz). The effects of pulse frequency, mass concentration of CoSO4 in bath, duty cycle, average current density, and pH on the surface morphology and wear resistance of Ni-Co alloy coating were studied. The Ni-Co alloy prepared by high-frequency pulse plating features lower porosity, better uniformity and compactness, and higher wear resistance as compared with that plated under direct current. The wear resistance of Ni-Co alloy coating is improved with increasing pulse frequency or CoSO4 content in plating bath, but becomes worse with increasing duty cycle or current density, and is improved initially but becomes worse later as increasing the bath pH. The optimal process conditions for preparation of Ni-Co alloy coatings by high-frequency pulse plating are as follows:CoSO4·7H2O 35 g/L, pulse frequency 140 kHz, duty cycle 0.2, average current density 2 A/dm2, pH of plating bath 3.5, temperature 55 °C, and time 40 min.
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