Atmospheric corrosion of copper and silver influenced by particulate matter |
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| Authors: | H Gil C P Buitrago J A Calderón |
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| Institution: | 1.Grupo de Investigación Innovación y Sostenibilidad Aplicadas a las Infraestructuras en Ingeniería—ISAII,Politécnico Colombiano Jaime Isaza Cadavid PCJIC,Medellín,Colombia;2.Centro de Investigación, Innovación y Desarrollo de Materiales—CIDEMAT,Universidad de Antioquia UdeA,Medellín,Colombia |
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| Abstract: | The atmospheric corrosion of copper and silver influenced by graphite and alumina as particulate matter (PM) in an environment containing 200 μg m?3 SO2 + 150 μg m?3 NO2 at 85% RH and 25 °C was analyzed. Different proportions of PM mixture conditions were used, and the corrosion rate was followed using gravimetric analysis. Results of linear sweep voltammetry (LSV) and coulometric reduction (CR) indicated that larger corrosion rates were obtained in the presence of deposited PM. Under present exposure conditions, copper corrosion rate was larger than silver corrosion rate. X-ray diffraction (XRD) shows the presence of cuprite (Cu2O) and brochantite (Cu4SO4(OH)6) in the case of copper and achantite (Ag2S) in the case of silver. |
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