How to meet the requirements of electrolytic oil and electroplating on the materials of the hanger?
According to the requirements of the electro-deoiling process, it is not suitable to use copper to make the hanger, otherwise the copper oxide film will be dissolved in the plating solution, and the plating solution will also be contaminated. Although some electrolytic oils have to undergo a weak corrosion treatment, the copper film on the copper hanger will also be corroded during the electrolysis process, but the corroded copper ions will continue to accumulate, when the workpiece is processed in this weak corrosion tank It will be replaced again, and the result will seriously affect the bonding strength of the coating. The finished copper hanger can be protected by a layer of nickel.
For general conventional plating species, in addition to acidic copper plating, it is possible to use steel material hangers or iron wire binding, and they can also meet the requirements.
Under normal circumstances, except for the first use, steel hangers are generally plated, mainly nickel, because nickel is mostly the final plating, and copper plated is mostly covered by nickel. .
For hangers that have been plated with zinc, cadmium, tin, lead, chromium, black nickel, etc., the coating should be removed before the second use to prevent these coatings from being dissolved in the solution and contaminating the solution during electrolytic degreasing , And affect the coating quality of the workpiece (when these metal ions accumulate in the electrolytic oil solution, they will be deposited on the workpiece during the cathodic electrolytic oil process, which will seriously affect the bonding strength of the coating during electroplating).