摘要
针对镀锌钢在高盐碱土壤地区耐蚀性差和铜材造价高等问题,以铝为基体加入4.5%铜和微量稀土元素,开发了铝铜稀土合金接地材料。试验结果表明,在碱性土壤中其耐腐蚀性能较镀锌钢提高2.4倍以上,450天长期埋设后接地电阻低于纯铜材料。电气腐蚀循环性能、机械性能、电流-温度循环、冰冻-融化、中性盐雾腐蚀、故障电流冲击等试验结果均满足相关标准要求。以其替代镀锌钢可大幅度延长接地网有效寿命周期,提高运行可靠性;替代纯铜或铜包覆钢,可降低接地工程的材料和施工成本。
Since Zinc is amphoteric and cannot resist corrosive attack at high pH values, the galvanized steels may suffer corrosion in alkaline soils. A novel aluminum alloy （A1-Cu alloy） with 4.5% mass copper and trace rare earth element is designed to substitute the galvanized steels in high pH value circumstance. The test results show that the corrosion resistances of aluminum alloy is 2.4 times of the galvanized steels. A 450 day＇s in-service grounding resistance test has been carried out and the results show that Al-Cu alloy has lower grounding resistance than pure copper. Furthermore, according to the criteria of IEEE Std 837-2002, the sequential tests, which include the current-temperature cycling test, mechanical tests, freeze-thaw tests, salt spray （fog） test and fault-current tests, confirm that A1-Cu alloy can satisfy all requirements and standards of grounding material. Instead of the galvanized steel, the A1-Cu alloy is therefore expected to enhance the service time and reliability as the grounding material.
出处
《中国电力》
CSCD
北大核心
2015年第9期100-105,共6页
Electric Power
关键词
接地网
土壤腐蚀
腐蚀与防护
铝铜合金
grounding grid
soil corrosion
corrosion and protection
aluminum-copper alloy
