Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
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 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
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.
2012. , 55 p.
zinc, atmospheric corrosion, automotive environment, de‐icing salt, corrosion products