Effect of cure temperature and phosphoric acid on corrosion resistance of phenolic resin on galvanized steel surface

Ryosuke Sako, Jun'Ichi Sakai

    Research output: Contribution to journalArticle

    Abstract

    The coating film formation and the corrosion resistance of phenolic resin were examined as an alternative for chromate on the galvanizing steel sheet. The effect of cure temperature and phosphoric acid on film formation and corrosion resistance was investigated by thermogravimetry and differential thermal analysis (TG-DTA), surface energy measurement, and the coating film characterization by XPS and FT-IR analysis. The mechanism of corrosion resistance was estimated by the polarization measurement of the coating plate. The resin, which was in an aggregate state at 80°C, gradually became loose by thermal energy as temperature rose, and it self-cured above 130- 150°C to make the film that gives good corrosion resistance. Addition of phosphoric acid to the phenolic resin solution has improved the corrosion resistance even at 120°C that is below the original self-cure temperature. Though the mechanism of the effect of phosphoric acid is not always clear, it was found that phosphoric acid promotes the cure of the resin and enhances the insolubility to the salt water. Also, it was confirmed that phosphoric acid itself is incorporated into the coating film. It seems that these facts improve corrosion resistance.

    Original languageEnglish
    Pages (from-to)402-409
    Number of pages8
    JournalZairyo to Kankyo/ Corrosion Engineering
    Volume61
    Issue number10
    DOIs
    Publication statusPublished - 2012

    Fingerprint

    Phenolic resins
    Steel
    Phosphoric acid
    Corrosion resistance
    Coatings
    Temperature
    Resins
    Chromates
    Electric power measurement
    Galvanizing
    Saline water
    Surface measurement
    Steel sheet
    Thermal energy
    Interfacial energy
    Differential thermal analysis
    Thermogravimetric analysis
    phosphoric acid
    phenol-formaldehyde resin
    X ray photoelectron spectroscopy

    Keywords

    • Chromium free
    • Corrosion resistance
    • Film formation
    • Galvanized steel
    • Mechanism
    • Phenolic resin
    • Surface treatment

    ASJC Scopus subject areas

    • Electrochemistry
    • Materials Chemistry
    • Metals and Alloys
    • Surfaces, Coatings and Films

    Cite this

    Effect of cure temperature and phosphoric acid on corrosion resistance of phenolic resin on galvanized steel surface. / Sako, Ryosuke; Sakai, Jun'Ichi.

    In: Zairyo to Kankyo/ Corrosion Engineering, Vol. 61, No. 10, 2012, p. 402-409.

    Research output: Contribution to journalArticle

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