The electroplating layer can provide effective protection for uranium and uranium alloys. The key factor affecting the anti-corrosion performance of the coating on the substrate is the denseness and binding force of the coating. The ferric chloride etchant can provide a suitable surface roughness so that the coating forms a good mechanical bond with the substrate and is relatively stable.
In water and chloride solutions, dense Ni plating exhibits some physical protection of uranium and uranium alloys. Once pores are present, the corrosion rate will increase due to local galvanic corrosion. The zinc coating provides a sacrificial anode for electrochemical protection of uranium and uranium alloys. The chromate-passivated Ni+Zn coating exhibits the best physical protection and sacrificial anode protection for uranium and uranium alloys. Although Zn-Ni alloy coating has good corrosion resistance, it can provide double protection for physical barriers and sacrificial anodes for uranium and uranium alloys. However, there are problems such as denseness and passivation of coatings, which make them less resistant to uranium and uranium alloys. Ni+Zn double plating. With the successful research of Zn-Ni alloy electroplating and passivation process, Zn-Ni alloy will play its superior anti-corrosion performance and be fully applied in the anti-corrosion of uranium and uranium alloy.
The corrosion protection of uranium and uranium alloys has a problem of poor coating tightness, which is mainly due to the adsorption of hydrogen molecules on the cathode side reaction in the plating process. In order to further improve the compactness of the plating layer and improve the physical and chemical properties of the plating layer, pulse plating can be used to obtain a plating layer with finer crystallinity, lower internal stress in the plating layer, and lower hydrogen content. In addition, cyanide-free galvanizing should be used to eliminate the hazard of cyanide