Study of the formation of a protective layer in a defect from lithium-leaching organic coatings

P. Visser*, A. Lutz, J. M C Mol, H. Terryn

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    28 Citations (Scopus)

    Abstract

    Lithium salts were investigated as leachable corrosion inhibitor and potential replacement for hexavalent chromium in organic coatings. Coatings loaded with lithium carbonate or lithium oxalate demonstrated active corrosion inhibition by the formation of a protective layer in a damaged area. The present paper provides more insight into the formation and composition of the protective layer in a damaged area generated from the lithium salt loaded coatings when exposed to neutral salt spray testing conditions (ASTM B-117). Lithium-ion leaching from the coating matrix was demonstrated with atomic absorption spectroscopy and the pH conditions in the damaged area were determined with a scanning ion-selective electrode technique. Additionally, the formation of the protective layer was studied with microscopic and surface analytical techniques. Scanning electron micrographs and Auger electron spectroscopy depth profiles revealed the process of coverage and growth of the protective layer in the damaged area. Furthermore, X-ray photoelectron spectroscopy analysis indicated that the protective layer likely consists of a hydrated oxide in the form of a (pseudo) boehmite with lithium distributed in its matrix.

    Original languageEnglish
    Pages (from-to)80-90
    JournalProgress in Organic Coatings
    Volume99
    DOIs
    Publication statusPublished - 2016

    Keywords

    • Aluminium
    • Coating
    • Corrosion
    • Inhibition
    • Leaching
    • Lithium

    Fingerprint

    Dive into the research topics of 'Study of the formation of a protective layer in a defect from lithium-leaching organic coatings'. Together they form a unique fingerprint.

    Cite this