Studies on effect of Copper corrosion passivators on the Paper insulated copper conductor by XRD, SEM and EDX analysis

The paper focuses on corrosion phenomena involving copper, corrosive sulphur and solid insulation of oil-immersed transformers. A study of the available mitigation technique such as passivation to reduce the effects of corrosion phenomena is carried out with the commercially available passivator, Irgamet 39 (Toluiltriazole dialkylamine) (ciba), with concentration of 100 ppm. The paper insulated copper conductors with transformer oil are aged for 1400 hrs at 140° C with and without passivators and tested both paper insulation and copper samples with the X-ray Diffraction (XRD), Scanning Electron Microscope(SEM) and Energy dispersive X-ray Spectroscopy (EDX). The SEM scan after ageing with passivator shows the formation of thin film of passivator on the copper surface. The SEM, XRD and EDX scans after ageing without passivator show the formation of copper sulphide on the copper surface as well as on the