银钨与银碳化钨电触头耐腐蚀能力研究

Study on Corrosion Resistance of AgW and AgWC Electrical Contacts

考察了熔渗法AgW和AgWC电触头在高低温交变湿热试验和盐雾试验中耐腐蚀能力,并比较了AgW电触头中有添加物和无添加物情况下的耐腐蚀能力。结果表明:在高低温交变湿热试验中,无添加物AgW电触头氧化速度最快,有添加物AgW电触头氧化速度有所减缓,随着添加物含量的增加,氧化速度变慢;AgWC电触头在14个试验周期结束后仍未发现有氧化迹象;在盐雾试验中,AgW电触头和AgWC电触头在240 h试验后均未发生明显氧化。结果表明:在高低温交变湿热环境中,AgWC电触头耐腐蚀能力明显优于AgW电触头;在盐雾环境中,AgW和AgWC电触头耐腐蚀能力相当。

The corrosion resistance capability of AgW and AgWC electrical contacts by infiltration method in high-low temperature alternating damp heat test and salt spray test was investigated,and the corrosion resistance capability of AgW electrical contacts with and without additives was compared.The results show that in the high-low temperature alternating damp heat test,the oxidation rate of AgW electric contact without additive was the fastest,and the oxidation rate of AgW electric contact with additive slowed down.With the increase of additive content,the oxidation rate slowed down.After 14 test cycles,no oxidation sign was found in AgWC electrical contact;In salt spray test,AgW electric contact and AgWC electric contact did not undergo obvious oxidation after 240 h tests.Therefore,it is concluded that:the corrosion resistance capability of AgWC electric contact is obviously better than that of AgW electric contact in high-low temperature alternating damp heat environment;the corrosion resistance capability of AgW and AgWC electrical contacts is equivalent in salt spray environment.