STUDY ON THE INHIBITION OF COPPER CORROSION WITH METAL PASSIVATOR T551 IN TRANSFORMER OIL

Abstract

Abstract: The corrosion inhibition function of benzotriazole (BTA) type metal passivator T551 in transformer oil was investigated based on corrosive sulfur test (ASTM D1275B), the related properties of transformer oil were tested and the copper strip samples were analyzed by SEM and TOF-SIMS. Test results showed that T551 metal passivator exhibited good inhibition function of copper corrosion and aging of transformer oil. Adding T551 metal passivator in transformer oil, the dielectric loss of transformer oil could be reduced from 0.21% to 0.08% and the volume resistivity improved from 5.97×1012Ω?cm to 7.05×1012 Ω?cm. The test results of copper strip surface indicated that chelation happened between T551 passivator and copper, the branch chain was broken from the nitrogen atom of BTA ring to form coordination compounds containing BTA and Cu on the copper surface.

Key words: benzotriazole, transformer oil , corrosive sulfur, metal passivator, copper

References

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