How can electroplating plants further improve the corrosion resistance of the electroless nickel plating layer when using electroless nickel plating solution?
While discussing the corrosion resistance of electroless nickel plating, the issue that people are more concerned about is how to further enhance or ensure its corrosion resistance. In the actual production using electroless nickel plating solution, we have found that the factors affecting the performance of electroless nickel plating are no more than the quality of the substrate, pretreatment, plating bath and plating process, post-treatment of the deposited layer, and quality inspection at each stage. Some of these contents have been discussed in the previous articles. Here, we only add a few issues related to corrosion resistance.
Quality of the base metal
This is the basic guarantee of coating quality, but it is often overlooked by people. Before electroless nickel plating, the technicians of the electroplating plant must understand the composition, state, metallurgical quality and processing and forming process of the workpiece material. Improper processing can cause stress and microcracks.
There should be no defects such as folds, welding chips, burrs, holes or sand holes on the workpiece. Inclusions in steel, especially sulfides, not only affect the corrosion resistance of the coating but also poison the plating solution.
Post-plating treatment
Chromate passivation combined with sealing treatment is the simplest and most effective method to enhance the anti-discoloration ability of electroless nickel plating layers, extend the salt spray test time and improve their corrosion resistance.
For instance, after applying the electroless nickel plating solution Ni-811 for plating, chromate passivation treatment is carried out, and then the nickel water-based sealer BH-1030 is used in combination as a post-protection process. This process is suitable for both electroplated nickel layers and electroless nickel layers. It is not only applicable to rack plating but also can be used in barrel plating processes. Under the same nickel layer thickness, it can significantly enhance the corrosion resistance of the coating.
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