Product to be handled before plating porous material filling

Castings or other possible with loose, porosity, blisters, slit or parts with micro-cracks will encounter a similar situation. Powder metallurgy parts and other porous molybdenum plating in the electroplating process was easily penetrate not only difficult to clean, and the residual leakage in the future will destroy the coating bath and in contact with other materials.
Without sealing of such parts, the only way after plating only be repeated soaking and cleaning, alternating hot and cold water will often be helpful.
The thickness of the coating will be affected. If the coating is thin, the coating will not affect the cleaning, just pay attention to careful and thorough cleaning. Sometimes when dry washed oozing check the pH of the water or salts, can also be a general understanding of whether or not thoroughly cleaned.
If the coating is thick plating speed, sealing can often play a role. Many problems intermediate thickness of the coating. Because the coating is often incomplete in the opening portion is formed in the bridge. This architecture makes cleaning particularly difficult.
Currently popular approach is to porous resin parts such as powder products, or some of the melted wax compounds the hole closed. With pore-filling method to avoid the problems caused by not thoroughly cleaned, while selecting the electroplating process used to try to avoid a solution containing corrosive or corrosive media promotion, such as avoiding a solution of chloride ions and other substances.
To fill the hole shall be filled with a high tungsten carbide inserts before baking to remove fumes, so you can remove the oil remaining in the hole to help the sealant to enter and combine divisible dip resin closed after oil, vacuum filling effect than simply soaking better. General product used zinc stearate soaked in 150-180 degrees, sealing effect is also good, but the plating process should avoid using strong acid to prevent the closure material dissolved.
Porous parts after plating dip in overlapping good performance replacement-type anti-rust oil is also good. Because such ability to penetrate the oil, corrosion and water displacement effects are strong, help cleaning is not thorough enough to prevent excessive corrosion damage.