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Evidence for an unusual temperature dependence of the atmospheric corrosion of zinc

Mohsen Esmaily (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Seyedeh Nooshin Mortazavi (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; Jan-Erik Svensson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Lars-Gunnar Johansson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi)
Journal of the Electrochemical Society (0013-4651). Vol. 163 (2016), 14, p. C864-C872.
[Artikel, refereegranskad vetenskaplig]

The atmospheric corrosion behavior of zinc in the presence of NaCl has been investigated using well-controlled laboratory exposures in 95% RH air at ten different temperatures in the range -4 to 22°C. Results show that a critical temperature (? -0.5°C) exists in zinc corrosion above which the rate of corrosion is constant/independent of temperature, and, below which there is a positive correlation between temperature and corrosion rate. The corrosion products formed above and below -0.5°C are also entirely different. While simonkolleite, hydrozincite and zinc carbonate hydroxide are the main corrosion products at T ?-0.5°C, the same compounds are absent at T < -0.5°C. Instead, sodium zinc carbonate (Na2Zn3(CO3)4.3H2O) is the dominant corrosion product at low temperature, together with Na2ZnCl4 · 3H2O and sweetite (Zn(OH)2). The results are interpreted in terms of two distinct corrosion modes prevailing at "high" and "low" temperature, respectively.



Denna post skapades 2017-01-25. Senast ändrad 2017-03-22.
CPL Pubid: 247702

 

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