Análisis de fallos de los tubos de cobre utilizados en los intercambiadores de calor de los ventiloconvectores

Fatih Sargın; Kürşat Kanbur; İlyas Türkmen

doi:10.3989/revmetalm.239

Authors

Fatih Sargın Manisa Celal Bayar University, Metallurgical and Materials Engineering Department https://orcid.org/0000-0002-2683-4543
Kürşat Kanbur Manisa Celal Bayar University, Metallurgical and Materials Engineering Department https://orcid.org/0000-0001-6343-2992
İlyas Türkmen Manisa Celal Bayar University, Metallurgical and Materials Engineering Department https://orcid.org/0000-0002-5424-5412

DOI:

https://doi.org/10.3989/revmetalm.239

Keywords:

Ant-nest corrosion, Copper pipe, Failure analysis, Heat-exchanger, Microstructural analysis

Abstract

Heat exchangers (HE) consist of copper and steel pipes and are used for heating and cooling the ambient air. One of the main problems seen in HE is the leakage on copper pipes. In this study, failed and properly working copper pipe samples used for different durations were examined in detail. The microstructural analyses were performed using optical microscopy (OM) and scanning electron microscopy (SEM) to detect corrosion occurrences on copper pipe surfaces. In addition, corrosion products of the samples were defined by X-Ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS) and Fourier-Transform Infrared Spectroscopy (FTIR) analyses. The formation of interconnected tunnels in cross section of the failed copper pipe sample that were in microscopic dimensions and corrosion products were observed. Consequently, all the analyses result that were obtained from the samples pointed out a corrosion mechanism known as ant-nest corrosion. It was concluded that the main reason of corrosion was related to ethylene glycol type additives which were used in HE along with mains water.

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