Cyanide-free and nontoxic imitation gold plating complexant and cyanide-free, non-phosphorus and ammonia-free imitation gold plating liquid

The invention discloses a cyanide-free and nontoxic imitation gold plating complexant and cyanide-free, non-phosphorus and ammonia-free imitation gold plating liquid, which belong to the technical field of surface electroplating processing of metal or nonmetal products. The complexant takes citric acid as a main complexant and succinimide as an auxiliary complexant, has higher complexing power, is cyanide-free and nontoxic and has no adverse effects on human bodies and environment. Besides, the cathode current efficiency of the complexant is higher than that of the plating liquid of other cyanide-free complexant systems by more than 10-20%, a deposition rate is fast, the depth capacity and dispersity are good, and the complexant is suitable for long time electroplating of small-sized workpieces with complex shapes and small aperture-depth ratios, can be used for manual or automated continuous electroplating, and is not only suitable for rack plating but also suitable for barrel plating products. In addition, the imitation gold plating liquid prepared by the cyanide-free and nontoxic imitation gold plating complexant is cyanide-free, non-phosphorus and ammonia-free, is stable and transparent for long term and has no turbidity and sediment phenomena.