在2197铝锂合金表面进行化学镀镍，采用能谱仪（EDS）、扫描电子显微镜（SEM）等对镀层成分及表面形貌等进行分析。分别通过沉积速率和耐变色时间评价镀镍层的镀速和耐蚀性，研究了3种络合剂（苹果酸、甘氨酸、柠檬酸三钠），稀土化合物[La（NO₃）₃、Ce（SO₄）₂]和重金属化合物CuSO₄的最佳添加量。结果表明：在2197铝锂合金表面进行化学镀镍可得到一层呈胞状结构、较均匀细致的镀镍层；化学镀镍液中络合剂的最佳复配配方为3 g/L苹果酸、3 g/L甘氨酸、30 g/L柠檬酸三钠，得到镀镍层同时具有较好的耐蚀性和较快的镀速；在化学镀镍液中添加少量Ce（SO₄）₂、La（NO₃）₃和CuSO₄有利于提高镀速，但会降低镀镍层的耐蚀性，Ce（SO₄）₂和La（NO₃）₃的添加量均以不超过0.5 mg/L为宜，CuSO₄的添加量以不超过2 g/L为宜。

Electroless nickel plating was carried out on the surface of 2197 Al-Li alloy. The composition and surface morphology of the plating were analyzed by energy dispersive spectrometer (EDS) and scanning electron microscopy (SEM). The plating rate and corrosion resistance of the nickel plating were respectively evaluated by deposition rate and chromogenic time. The optimum additions of three complexing agents (malic acid, glycine, trisodium citrate), rare earth compounds[La (NO₃)₃, Ce (SO₄)₂] and heavy metal compound CuSO₄ were studied. The results show that a uniform fine nickel plating with cellular structure could be obtained by electroless nickel plating on the surface of 2197 Al-Li alloy. The optimum mixed formulation of complexing agent in electroless nickel plating bath was 3 g/L malic acid, 3 g/L glycine and 30 g/L trisodium citrate. The nickel plating had good corrosion resistance and fast plating rate under the optimum mixed formulation. Adding a small amount of Ce (SO₄)₂, La (NO₃)₃ and CuSO₄ in the electroless nickel plating bath could improve the plating rate, but reduce the corrosion resistance of the nickel plating. So the addition of Ce (SO₄)₂ and La (NO₃)₃ should not exceed 0.5 mg/L, and the addition of CuSO₄ should not exceed 2 g/L.