The Tarnish Process of Silver in H2S Environments

초록

The effects of sub-ppm levels of H2S and the adsorbed water on the atmospheric corrosion of silver were studied with In situ weight balance to study the effect of the adsorbed water on the kinetic behavior and to determine the rate-controlling step, with XPS to analyze the tarnish film, and with calculation of phase equilibrium to predict the stable solid phase, the concentrations of dissolved species (Ag+, H+, S2-, HS-) and the equilibrium potentials ( ). The results of weight measurements showed that oxygen was required for the sulfidation of silver in 100 ppb H2S and humidified environments enhanced the tarnished rate and oxidizing power. In addition, the rate determining step for tarnishing silver was shown to be changed to transport though the tarnish film

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