Atmospheric corrosion of Galfan coatings on steel in chloride-rich environments
2013 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 73, 62-71 p.Article in journal (Refereed) Published
Galfan coatings on steel in laboratory exposures with predeposited NaCl and cyclic wet/dry conditions exhibit nearly the same corrosion products as after 5 years of marine exposure. A general scenario for corrosion product evolution on Galfan in chloride-rich atmospheres is proposed. It includes the initial formation of ZnO, ZnAl2O4 and Al2O3 and subsequent formation of Zn6Al2(OH)(16)CO3 center dot 4H(2)O, and Zn2Al(OH)(6)Cl center dot 2H(2)O and/or Zn5Cl2(OH)(8)center dot H2O. An important phase is Zn6Al2(OH)(16)CO3 center dot 4H(2)O, which largely governs the reduced long-term zinc runoff from Galfan. A clear influence of microstructure could be observed on corrosion initiation in the slightly zinc-richer eta-Zn phase adjacent to the beta-Al phase.
Place, publisher, year, edition, pages
2013. Vol. 73, 62-71 p.
Metal coatings, Zinc, Aluminum, IR spectroscopy, SEM, Atmospheric, corrosion
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-125546DOI: 10.1016/j.corsci.2013.03.025ISI: 000320736900007ScopusID: 2-s2.0-84878375987OAI: oai:DiVA.org:kth-125546DiVA: diva2:640283
QC 201308132013-08-132013-08-092014-09-15Bibliographically approved