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The influence of the amount of ammonium sulfate particles on the atmospheric corrosion mechanism of copper

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Unger, M., Stratmann, M., & Lobnig, R. E. (1998). The influence of the amount of ammonium sulfate particles on the atmospheric corrosion mechanism of copper. In P. M. Natishan, H. S. Isaacs, M. Janik Czachor, V. A. Macagno, P. Marcus, & M. Seo (Eds.), Proceedings of the Symposium on Passivity and its Breakdown (pp. 949-960).


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-735F-5
Abstract
The influence of the amount of submicron ammonium sulfate ((NH4)(2)SO4) particles on the corrosion mechanism of copper has been investigated at 93% relative humidity (RH) and room temperature with surface analytical methods. Posnjakite (Cu-4(OH)(6)SO4 H2O) is the first corrosion product identified. For particle deposits up to 0.3mg/cm(2) (NH4)(2)SO4, the posnjakite decomposes and Cu2O is formed, With 13mg/cm(2) (NH4)(2)SO4, conversion of posnjakite to brochantite (Cu-4(OH)(6)SO4) or antlerite (Cu-3(OH)(4)SO4) takes place instead. The reaction rate increases with decreasing amounts of particle deposits.