Cyanide-free gold electroplating liquid
A technology of electroplating gold and gold trichloride, which is applied in the field of surface modification of metal materials, can solve the problems of difficult recycling of gold plating solution, environmental pollution, explosive intermediate products, etc., and achieve good economic and social benefits
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example 1
[0013] Example 1: the composition of the gold plating solution is as follows:
[0014] Gold trichloride 12g / L,
[0015] Main complexing agent sodium sulfite 70g / L,
[0016] Auxiliary complexing agent EDTA 70g / L,
[0017] Sodium chloride 60g / L,
[0018] The rest is water.
[0019] Electroplating was carried out according to the composition of the above gold-plating solution. As a result, gold was plated on the copper wire, and the grains of the gold-plated layer were fine, showing a bright golden yellow color. The adhesive tape test was carried out to test the bonding force between the gold-plated layer and the substrate, and it was found that the gold-plated layer had no bubbles. Shedding phenomenon. After the plating solution was placed at room temperature for two months, the plating solution did not appear cloudy or discolored, and the performance of the obtained gold-plated layer was almost the same as before.
example 2
[0020] Example 2: the composition of the gold plating solution is as follows:
[0021] Gold trichloride 20g / L,
[0022] Main complexing agent potassium sulfite 130g / L,
[0023] Auxiliary complexing agent sodium citrate 80g / L,
[0024] Potassium chloride 80g / L,
[0025] The rest is water.
example 3
[0026] Example 3: the composition of the gold plating solution is as follows:
[0027] Gold trichloride 10g / L,
[0028] Main complexing agent sodium sulfite 50g / L,
[0029] Auxiliary complexing agent EDTA 50g / L,
[0030] Sodium chloride 50g / L,
[0031] The rest is water.
[0032] Electroplating is carried out according to the gold-plating solution described in example 2 and example 3, and the performances of the gold-plated layer obtained are all similar to the results of example 1.
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