Abstract
The corrosion rate of copper and bronze Cu-8wt.%Sn increased rapidly when the concentration of formic or acetic acid in air reached about 300ppb at 80% relative humidity (RH) and a temperature of 20°C. It decreased slowly during the several days after pollutant removal due to the slow rate of pollutant desorption from the metal surfaces. Corrosion of these metals was barely affected by the acids at RH up to 60%. For iron, the critical concentration of formic acid in air which led to surface activation at 80% RH was between 1000 and 1590ppb.
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