Static secondary ion mass spectrometry investigation of corrosion inhibitor Irgamet ® 39 on copper surfaces treated in power transformer insulating oil

Abstract

Static secondary ion mass spectrometry was used to study the corrosion inhibitor Irgamet®39 on the surface of copper treated in insulating oils and the effect of temperature changes, by means of temperature programmed desorption experiments under vacuum, on metal coverage. Four commercial oils, both corrosive and noncorrosive, showed no significant influence on the stability of the tolyltriazole layer and the energy of its main desorption event from copper was calculated around 100 kJ mol -1 . Finally, an example of ion imaging as diagnostic tool to track the distribution of corrosion inhibitor and by-products in decommissioned or failed power transformers is described. HighlightsSSIMS was used to study corrosion inhibition of copper treated in insulating oil.Desorption experiments allowed the study of the inhibitor stability in vacuum.The energy of desorption of tolyltriazole under SSIMS conditions was calculated.SSIMS imaging was shown to be an applicable new diagnostic tool for transformers.

Gas production mechanism of Irgamet 39 and its long‐term corrosion resistance

“…Specifically, Irgamet 39 molecule provides “bare” nitrogen atoms via the inverse Mannich reaction [27–29] and interacts with cuprous ions. Then polymer complexes are generated and attached to the surface of copper, blocking the detrimental reaction of copper with DBDS [14, 30, 31]. The structure of the film is confirmed to be TTA‐Cu [32].…”

Hexagonal Boron Nitride for Sulfur Corrosion Inhibition

“…The polarization plots for bare Cu and FL-hBN-Cu did not display anticipated Tafel behavior in the potential range of 70-100 mV (Fig 3a). We therefore determined the corrosion rates using a linear region from 30-40 mV using the equation (2).…”

“…For example, airborne sulfur dioxide negatively impacts the safety and readiness of military equipment (e.g., an F-14 aircraft crash due to corrosion of its landing gear), requiring the U.S. to spend $20 billion annually to deal with corrosion issues . Biotic corrosion, commonly termed as microbiologically influenced corrosion (MIC), turns harmless sulfates into aggressive sulfides to degrade copper components of pipelines, transformers, printed circuit boards, and mechanical equipment, all under ambient conditions. Sulfur corrosion is typically controlled by introducing a protective coating layer of polymers such as VOC alkyd, silicone alkyd, polyurethane, latex, epoxy, and polyamides .…”