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Corrosion of zinc in the automotive environment: Corrosion of zinc in a road environment :relation betweeen corrosion rate, corrrosion products and exposure site
RISE, Swerea, Swerea KIMAB.
2012 (English)Report (Refereed)
Abstract [en]

In a previous project, mobile exposures in road environments have been performed in various areas of the world. A number of materials and coatings have been attached under trailers which travels long distances in different types of road environments. One of the materials, zinc, demonstrated various corrosion rates in different parts of the world. In this investigation two various accelerated corrosion tests have been performed at the laboratory of Swerea KIMAB AB in order to realize parameter influence on zinc. Even though the corrosion rates are known, the relation to formed corrosion products has not been investigated earlier. In the present study, corrosion products on zinc have been analyzed using XRD and FTIR. The results from analyses of formed corrosion products have been evaluated together with measured corrosion rates, both from the mobile exposure and the accelerated tests, in order to try to understand under what conditions certain corrosion products are formed and how it affects the corrosion rate. A cold humid climate was found to be the most corrosive. In these environments, de-icing salts are used which promotes formation of simonkolleite and in a subsequent step; gordaite (if there is a not negligible deposition rate of SO2/SO42-) which is often observed as the end product in marine environments.

Place, publisher, year, edition, pages
Swerea KIMAB AB , 2012.
Series
Rapport / Institutet för metallforskning, ISSN 1403-848X ; KIMAB-2012-105
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13053OAI: oai:DiVA.org:ri-13053DiVA: diva2:973247
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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