Supercritical carbon dioxide treatment of hot dip galvanized steel as a surface treatment before coating

Ville Saarimaa, Aaretti Kaleva, Juha-Pekka Nikkanen, Saara Heinonen, Erkki Levänen, Pasi Väisänen, Antti Markkula, Jyrki Juhanoja

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)

    Abstract

    Supercritical carbon dioxide (scCO2) treatment was employed for rapid formation of a zinc patina layer on hot dip galvanized (HDG) steel. In the presence of H2O and a Cu precursor, an artificial patina consisting of two distinctive phases was formed: a dense ~ 1 μm layer of anhydrous ZnCO3 adjacent to native zinc coating, and a needle-like porous structure showing resemblance to hydrozincite (Zn5(CO3)2(OH)6). The artificial patina layer significantly decreased the surface free energy of HDG, which was evidenced also by good wettability by a polyester melamine coating. Furthermore, the needle-like patina surface structure stayed intact through the coating process, indicating improved coating adhesion. ScCO2 treatment facilitates rapid and impurity-free surface treatment of hot dip galvanized steel, and could be used to tailor novel adhesion and corrosion promoting surface morphologies.

    Original languageEnglish
    Pages (from-to)137-142
    Number of pages6
    JournalSurface and Coatings Technology
    Volume331
    DOIs
    Publication statusPublished - 15 Dec 2017
    Publication typeA1 Journal article-refereed

    Keywords

    • Basic zinc carbonate
    • Coatings
    • Corrosion resistance
    • Hot dip galvanized steel
    • Patina
    • Supercritical carbon dioxide
    • Zinc

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • Chemistry(all)
    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Materials Chemistry

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