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Título: | Formicary corrosion of copper tubes after two months in service |
Autor: | Bastidas, David M. CSIC ORCID; Cano Díaz, Emilio CSIC ORCID ; Bello, L.; Bastidas Rull, José María | Fecha de publicación: | 2006 | Editor: | Wiley-VCH | Citación: | Formicary corrosion of copper tubes after two months in service: 125-129 (2006) | Resumen: | In air-conditioning applications premature failure of copper tubing frequently occurs due to pitting corrosion after a short period in service and even during post-installation leakage tests and during degreasing and stamping processes. This unusual type of localised corrosion in thin-walled tubes has been described in the bibliography as ‘ant-nest’ (formicary) corrosion. Copper tubes that suffer this type of corrosion are mainly used in heat-transfer units such as evaporators, air-conditioners, refrigerators, condensers, radiators and solar-systems. The morphology of this corrosion is characterised by the development of longitudinal pits that form interconnecting microcavern channels of random direction that contain porous copper oxide in directional pits. Usually, microscopic tunnels start on the surface of the copper tubing and progress into the tube wall. Copper tubes used in a commercial air-conditioning system were analysed to assess the reasons for their premature corrosion failure during leakage tests after installation and during their first two months in service. Scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis and X-ray photoelectron spectroscopy (XPS) were the techniques utilised. Volatile organic acids, chlorine and sulphur, originated by the manufacturing processes, were identified as possible sources of the premature copper corrosion failure. | URI: | http://hdl.handle.net/10261/85219 | DOI: | 10.1002/9783527610327.ch16 | Identificadores: | doi: 10.1002/9783527610327.ch16 |
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