Filiform corrosion of electrocoated aluminium alloy: Role of surface pretreatmentShow others and affiliations
2012 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 65, p. 187-198Article in journal (Refereed) Published
Abstract [en]
Commercial Oxsilan, 3-aminopropyltriethoxysilane and sol-gel siloxane coatings were applied on AA6016 aluminium alloy before electrocoating. Standard filiform corrosion test demonstrated the pre-treatment role on the under-paint corrosion rate. All pre-treatments increase the coating adhesion in water electrolyte (EIS). Anodic undermining is the mechanism of the coatings de-adhesion (SKP). Electromotive force (difference in potentials of defect-surrounding interface) and interface ability to promote the chloride migration are rate-determining factors of the filiform corrosion. Contrary to other pre-treatments, the aminosiloxane decreases the interfacial potential, facilitates the chlorides migration and leads to anodic de-adhesion of large coated areas (Tof-SIMS and EDXS).
Place, publisher, year, edition, pages
2012. Vol. 65, p. 187-198
Keywords [en]
A. Aluminium, A. Organic coatings, B. EIS, B. SIMS, B. SKP, C. Filiform corrosion, 3-aminopropyltriethoxysilane, Coating adhesion, Deadhesion, Electrocoatings, Filiform corrosion, Interfacial potential, Pre-Treatment, Pre-treatments, Siloxane coatings, Surface pretreatment, ToF SIMS, Water electrolytes, Aluminum, Chlorine compounds, Electromotive force, Organic coatings, Secondary ion mass spectrometry, Sol-gels, Adhesion
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-51131DOI: 10.1016/j.corsci.2012.08.013Scopus ID: 2-s2.0-84867232631OAI: oai:DiVA.org:ri-51131DiVA, id: diva2:1514648
2021-01-072021-01-072023-05-16Bibliographically approved