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GILDES model simulations of the atmospheric corrosion of zinc induced by low concentrations of carboxylic acids
Royal Institute of Technology (KTH).
Royal Institute of Technology (KTH).
RISE, Swerea, Swerea KIMAB.
2012 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 159, no 3, p. C123-C128Article in journal (Refereed)
Abstract [en]

The GILDES computer based model was successfully applied to the atmospheric corrosion of zinc exposed to low concentrations of carboxylic acids in humidified air at room temperature. Under these exposure conditions the expected precipitated phases are zinc oxide (ZnO), zinc hydroxide (Zn(OH) 2) and several forms of hydrated zinc carboxylate, Zn(CH 3CH 2COO) 22H 2O, Zn(CH 3COO) 22H 2O and Zn(HCOO) 22H 2O. The results were compared to those from laboratory exposures obtained in the same conditions. The model correctly predicts the trend for ZnO and zinc carboxylate formation found in experimental exposures for the three acids tested. According to the simulations, surface protonation, surface acid base reactions, as well as ligand- and proton- induced dissolution reactions play a major role in the initial atmospheric corrosion of zinc. Henrys law constant (K H) is found to be an important parameter but uncertain due to different reported literature values. When K H is increased the formation rate of zinc carboxylate also increases. K H increases in the sequence propionic acid acetic acid formic acid, the same order as found for the calculated dissolution rate. © 2012 The Electrochemical Society.

Place, publisher, year, edition, pages
2012. Vol. 159, no 3, p. C123-C128
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12841DOI: 10.1149/2.072203jesScopus ID: 2-s2.0-84857406207OAI: oai:DiVA.org:ri-12841DiVA, id: diva2:973034
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2017-11-21Bibliographically approved

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