The stability of organosilanes in water for use as protective films

I. K. Eriksson-Scott, G. R. Dennis

    Research output: Chapter in Book / Conference PaperConference Paperpeer-review

    Abstract

    ![CDATA[Finding an alternative to chromate passivation of galvanised steel is critical due to the detrimental health effects associated with hexavalent chromium. Organosilanes have been proposed as a promising alternative, as they have been shown to give comparable results to chromate passivation. Commonly organic solvents such as ethanol are used as the solvent for the organosilanes, therefore industrial applications are limited die to ethanol’s low flash point. Few water based systems incorporating organosilanes have been described in literature, but the stability of organosilanes in water over time is a major issue with these systems. Surfactants have been suggested as a means of increasing the stability for aqueous emulsions. The effect of surfactant o the stability of organosilanes in water was tested. Three different surfactants were used: anionic, and small and large non-ionic surfactants. The organosilanes used were mercaptopropyltrimethoxysilane, and vinyltrimethoxysilane, both are semi-soluble organosilanes in water. The properties of emulsions over time we tested by Dynamic Light Scattering, and it was found that we could produce stable emulsions and that the type of surfactant and organosilane highly affects the emulsion stability properties. The films created by the stable organosilane emulsions were tested by Scanning Electron Microscopy to give information about the film structures. Electrochemical; Impedance Spectroscopy was used to analyse the protective properties of the created films. The film properties were also significantly affected by the type of organosilane/surfactant combination.]]
    Original languageEnglish
    Title of host publicationCorrosion Management for a Sustainable World: Transport, Energy, Mining, Life Extension and Modeling: Proceedings of Corrosion & Prevention 2012, 11-14 November 2012
    PublisherAustralasian Corrosion Association Inc.
    Number of pages10
    Publication statusPublished - 2012
    EventAustralasian Corrosion Association. Conference -
    Duration: 11 Nov 2018 → …

    Conference

    ConferenceAustralasian Corrosion Association. Conference
    Period11/11/18 → …

    Keywords

    • organosilicon compounds
    • protective coatings
    • chromates
    • steel, galvanised

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