Hot-dipped method is a common process that to take the products which melting points are higher than the plating solution into the plating solution. It is primarily used for plating the corrosion-resistant metal layers on the surfaces of plating pieces in order to enhance the effectiveness of their efficacy. Its basic process is similar to other plating method, including the pre-treatment, hot-dipped and post-processing. According to the difference of pre-treatment methods, hot-dipped can be divided into solvent method hot-dip process and hydrogen reduction hot-dipped process.

 

The processes of gold-plated tungsten solvent method hot dipped process can be seen as follows:

 

1, Before taking the solvent method hot-dipped gold process, we need to check the tungsten plating pieces firstly, to see if there is any greasy dirt, dust, defects left on the surface, which will affect the uniformity of impurities follow-up.

 

2, If there is any greasy dirt on the surface of the tungsten plating pieces, it should be firstly removed. The common used methods to remove the greasy dirt of the metal surface are including: alkaline degreasing method, emulsion degreasing method and the organic solvent degreasing method. The organic solvent degreasing method is the common used method for removing the greasy dirt when using solvent method hot-dipped process.

 

3, Drying the tungsten plating pieces after cleaning the residual lye with water.

 

4, Pickling, using the acidic solvent to clean the impurities of tungsten plating pieces again, then drying them after washing with water. 

 

5, Preheating and drying tungsten plating pieces after cleaning it with solvent.

 

6, Finally, Immersing the dried and preheated tungsten plating pieces into the plating solution, and finished with drying and cooling the gold-plated tungsten products after uniformly plating.

 

Due to the high melting point of tungsten, so it’s suitable for using the solvent method hot-dipped process. The equipment and technology that used in this process is very simple and can be easy to operate. It also has a wide range of plating products, which has low cost. The plating layers of gold-plated tungsten products have the high quality by using this method.