A metal passivator is often added to transformer oil to inhibit oil sulfur corrosion. However, the addition of passivator can result in gaseous anomaly in the oil and need to be added regularly. In this paper, the copper winding of transformer is treated by grain boundary engineering technology, and the corrosion resistance of the winding before and after treatment is compared according to IEC 62535 standard. The experimental results show that the copper windings treated by grain boundary engineering technology have good corrosion resistance. The original copper winding began to corrode when dibenzyl disulphide (DBDS) concentration achieved 50 mg/kg. Even DBDS concentration was up to 2000 mg/kg, the treated windings still had a good anticorrosion effect. Further, corrosion resistance mechanisms were explored, it is found that the corrosion resistance of the treated winding is better than that of addition passivator. The statistical analysis of the internal grain boundary of the copper windings shows that the twin grain boundary of treated windings increases obviously, and the increased twin grain boundary breaks the connectivity of the grain boundary, thus improving the corrosion resistance of the windings.

中文翻译：

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晶界工程技术提高变压器绕组抗硫腐蚀性能

变压器油中常加入金属钝化剂，以抑制油硫腐蚀。但是，钝化剂的添加会导致油中气态异常，需要定期添加。本文采用晶界工程技术对变压器铜绕组进行处理，并根据IEC 62535标准对处理前后绕组的耐腐蚀性能进行比较。实验结果表明，经晶界工程技术处理的铜绕组具有良好的耐腐蚀性能。当二硫化二苄 (DBDS) 浓度达到 50 mg/kg 时，原来的铜绕组开始腐蚀。即使DBDS浓度高达2000mg/kg，处理后的绕组仍具有良好的防腐效果。此外，还探索了耐腐蚀机制，发现处理过的绕组的耐腐蚀性能优于添加钝化剂的绕组。对铜绕组内部晶界的统计分析表明，处理过的绕组孪晶晶界明显增加，增加的孪晶晶界破坏了晶界的连通性，从而提高了绕组的耐腐蚀性能。