Tungsten gold-plated refers to draw support of some other ways, such as chemical methods or direct current effects of gold-plating process to make the tungsten products surface deposited a gold-plating layer. Its technical process mainly includes three aspects: gold-plating pretreatment, gold-plating and gold- plating after-treatment. The purpose of pre-treatment is to keep the products’ surface clean, which is the premise to guarantee the beautiful appearance of tungsten gold-plated products. As for the after-treatment, it is an important step that to eliminate the downside occurring in the gold-plating process and to ensure the integrity of the finished products. According to the difference of gold-plating solution, gold-plating can be divided into non-cyanide gold-plating, alkaline cyanide gold-plating, neutral cyanide gold-plating and acidic cyanide gold-plating. As mentioned above, because of the strong cathodic polarization and coverage performances of cyanide gold-plating, the integrated performances of products made of cyanide gold-plating are better than the non-cyanide gold-plating. Therefore, for tungsten gold-plated products, its main gold plating process also lies in cyanide gold-plating.

 

Although alkaline cyanide gold-plating solution has a strong cathodic polarization, but because of excessive amounts of highly toxic, cyanide would harm the human bodies, therefore it is not suitable for tungsten gold-plated. Compared with the alkaline cyanide, neutral and acidic cyanide gold-plating is more moderate,and has a good weldability, bright and smooth surface  with the low porosity. Moreover, the tungsten gold-plated products made of cyanide gold-plating solution has a high hardness, good wear resistance and bright surface color as well as the high appreciation value.

 

But gold-plating will cause environmental pollution, although the cyanide content of neutral and acidic cyanide gold-plating solution is low, but there are still toxic substances. Therefore, it’s necessary for tungsten gold-plated manufacturers to research and develop some new environmentally friendly gold-plating methods.