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Transformer oil samples were divided into two groups and classified according to the presence or absence of Irgamet 39, a metal passivator. After 48 h reaction at 150 oC, the copper strips were characterized by scanning electron microscopy, and attenuated total reflection Fourier transform infrared spectroscopy. The results showed that Irgamet 39 bonded to copper surfaces and created an impermeable...
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