The synergistic effect of hydrogen sulfide and nitrogen dioxide on the atmospheric corrosion of zinc
- Chalmers Univ. of Technology, Goeteborg (Sweden). Dept. of Inorganic Chemistry
A laboratory study of the effect of sub-ppm levels of H{sub 2}S and NO{sub 2} on the atmospheric corrosion of zinc in humid air is reported. Each sample was exposed individually to a synthetic atmosphere with careful control of pollutant concentrations, relative humidity, and flow conditions. Corrosion products were analyzed by grazing angle X-ray diffraction and X-ray photoelectron spectroscopy. Ion chromatography was employed to identify water soluble anions. The interaction of the pollutants with zinc metal was studied using trace gas analysis in real time. A strong H{sub 2}S/NO{sub 2} synergism was observed. The main solid product was zinc blende (ZnS), accompanied by small amounts of sulfate. The optically smooth zinc sulfide film was shown to grow by solid-state diffusion of ions, the rate controlling step being the deprotonation of H{sub 2}S adsorbed on the ZnS surface. NO{sub 2} acts as a cathodic depolarizer, forming HNO{sub 2}(g), resulting in a strongly increased rate of zinc sulfidation.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 201390
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 1 Vol. 143; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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