Indoor Corrosion of Copper and Silver Exposed in Japan and ASEAN1 Countries

Abstract

Copper and silver test specimens were subjected to indoor exposure tests carried out at 23 sites in Tokyo, Bandung, Singapore, and Bangkok. At the same time, the deposition rates of , , , , and particles which had deposited on the sampling devices were measured. Corroded specimen surfaces were examined by electron probe microanalysis, Auger electron spectroscopy, x‐ray photoelectron spectroscopy, infrared spectroscopy, and x‐ray diffraction, and corrosion rates were measured by the electrolytic reduction method. On the surface of Cu, oxides, hydroxides, chlorides, sulfates, sulfides, nitrates, and carboxylates were detected. The Cu corrosion rate correlated with the deposition rate. On the surface of Ag, sulfides, sulfates, chlorides, and nitrates were found in the environments slightly polluted with , but only was found in the environments heavily polluted with . The Ag corrosion rate showed a correlation with the deposition rate.