Research on Corrosion Suppression Technology of Plum Blossom Contact in High Voltage Switchgear Based on Different Surface Treatment Technologies

The surface corrosion problem of plum blossom contact caused by high humidity environment is one of the main reasons for serious faults in high-voltage switchgear. Therefore, the corrosion characteristics of plum blossom contacts with different surface treatments, and combines polarization curve and other testing methods to study a new method for evaluating the corrosion resistance performance of copper contacts are analyzed. The corrosive medium used in the experiment is a mixed solution of 5% NaOH and NaHCO₃, with a scanning speed of 5 mV/s and a scanning interval of ±5 mV. The results show that the copper contacts treated with silver plating and gold plating have a higher corrosion potential and lower corrosion current, which may be related to the low oxidation of the composite coating material. The corrosion resistance of copper contacts shows a non-monotonic trend with different thicknesses of silver plating, where the comprehensive corrosion resistance performance is better at a thickness of 16 μm, and a nano coating with a solid content of 10% is the optimal treatment condition for surface hydrophobic coating treatment. It is speculated that this phenomenon may be related to the uniformity and stability of the coating surface. The calculation results of the normalized evaluation function indicate that the corrosion resistance of copper contacts after single surface treatment is poor. The use of low oxidation metal strengthening coating and composite surface treatment technology can improve the corrosion resistance of different surface areas of plum blossom contacts. The normalized evaluation function F can be used as an evaluation parameter for the corrosion resistance performance of plum blossom contacts. The formulated plum blossom contact protection and repair plan can provide theoretical support for the operation and maintenance of on-site switchgear.