[目的]紫铜在高温或盐雾环境中易发生氧化腐蚀，影响其外观、导电性及服役寿命，亟需开发兼顾耐高温与耐盐雾的封闭处理技术。[方法]通过外观观察、色差与光泽度分析和接触电阻测试对比了不同样品在110°C高温烘烤和中性盐雾试验后的性能变化，对比了不同封闭剂的综合性能。[结果]LNN-03-Cu封闭后的紫铜在高温试验后表面色泽保持良好，色差ΔE<2.0，盐雾试验后腐蚀轻微，耐高温和耐盐雾性能均较优，但其接触电阻远高于其他样品。部分有机封闭膜层在导电性方面具有优势，但高温稳定性不足。[结论]LNN-03-Cu在耐高温和耐盐雾腐蚀方面具有显著优势，适用于对导电性无严格要求的防护场景；有机封闭剂在保持低接触电阻方面表现突出，但需进一步提升高温稳定性。实际应用中应根据部件功能需求合理选择封闭剂类型。

[Objective] Pure copper is susceptible to oxidation and corrosion in high-temperature or salt-spray environments, which compromises its appearance, electrical conductivity, and service life. There is an urgent need to develop sealing treatment technologies that offer both high-temperature resistance and salt-spray corrosion resistance. [Method] The performance changes of different specimens after 110 °C high-temperature baking and neutral salt spray testing were compared through appearance observation, color difference and glossiness measurement, and contact resistance detection, so as to evaluate the comprehensive properties of various sealants. [Result] The pure copper sealed with LNN-03-Cu maintained good surface color after the high-temperature test, with a color difference ΔE below 2.0, and exhibited only slight corrosion after the salt spray test, demonstrating superior high-temperature and salt-spray corrosion resistance. However, its contact resistance was substantially higher than that of the other specimens. Some organic sealants showed advantages in maintaining electrical conductivity but lacked sufficient high-temperature stability. [Conclusion] LNN-03-Cu exhibits significant advantages in high-temperature and salt-spray corrosion resistance and is suitable for protective scenarios where electrical conductivity is not critically required. Organic sealants perform prominently in maintaining low contact resistance but need further improvement in high-temperature stability. It is necessary to select the sealant according to the functional requirements of the component.