Role of O{sub 3} in the atmospheric corrosion of copper in the presence of SO{sub 2}
- Univ. of Goeteborg (Sweden). Dept. of Inorganic Chemistry
The influence of O{sub 3} in combination with SO{sub 2} in the ppb range on the atmospheric corrosion of copper was investigated using on-line gas analysis and gravimetry. Corrosion products were characterized qualitatively by x-ray diffraction and quantitatively by gravimetry and ion-chromatography of leaching solutions. Mechanisms are suggested for the interaction of O{sub 3} with the copper surface and for the sulfation process. The accelerating effect of O{sub 3} added to SO{sub 2} is considerable at 70% relative humidity, resulting in the formation of large amounts of cuprite and sulfates. At 90% relative humidity the effect of O{sub 3} is most marked at high SO{sub 2} concentrations that otherwise tend to inhibit copper corrosion. In combination with SO{sub 2}, O{sub 3} is a more powerful corrosion accelerator than NO{sub 2}. The influence of the two oxidizers on the corrosion process is basically different. O{sub 3} favors the formation of massive amounts of cuprite, while only small amounts are formed in the presence of NO{sub 2}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 533114
- Journal Information:
- Journal of the Electrochemical Society, Vol. 144, Issue 7; Other Information: PBD: Jul 1997
- Country of Publication:
- United States
- Language:
- English
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