25-27 November 2015
National Centre for Synchrotron Science
Australia/Melbourne timezone

GISAXS of pre-crystallisation events in the formation of CO2 corrosion products on steel

27 Nov 2015, 14:45
Oliphant Auditorium ()

Oliphant Auditorium

Oral Advanced Materials Advanced Materials III


Dr Bridget Ingham (Callaghan Innovation)


The corrosion of steel in aqueous saturated CO2 environments is a major industrial problem. Under certain conditions a highly protective scale of siderite (FeCO3) is formed; however, there is little information available regarding the initial nucleation processes. In recent years we have performed a number of in situ synchrotron X-ray diffraction studies using electrochemistry to accelerate the corrosion rate, exploring the effect of temperature [1], corrosion inhibitor species and concentrations [2-3], addition of Mg2+ [4] and Cr3+ [5], and steel microstructure [6] on the growth rates of crystalline FeCO3 films. These experiments all showed a significant induction period before a signal was observed. Recently we used grazing incidence small-angle X-ray scattering (GISAXS) and obtained evidence for an amorphous gel film that forms at much shorter times [7]. Our current hypothesis is that this amorphous gel then crystallises into either chukanovite (Fe2(OH)2CO3) or siderite, possibly via amorphous chukanovite as an intermediate phase. [1] Ingham, Ko, Kear et al., Corr. Sci. 52 (2010) 3052. [2] Ko, Laycock, Ingham & Williams, Corrosion 68 (2012) 1085. [3] Ko, Laycock, Ingham & Williams, NACE Int. Corrosion Conf. Ser. 5 (2012) 3662. [4] Ingham, Ko, Laycock et al., Corr. Sci. 56 (2012) 96. [5] Ko, Ingham, Laycock & Williams, Corr. Sci. 80 (2014) 237. [6] Ko, Ingham, Laycock & Williams, Corr. Sci. 90 (2015) 192. [7] Ingham, Ko, Kirby, Laycock & Williams, Faraday Discuss. In press (2015). DOI: 10.1039/C4FD00218K.
Keywords GISAXS, corrosion, electrochemistry, film, insitu

Primary author

Dr Bridget Ingham (Callaghan Innovation)


Prof. David Williams (University of Auckland) Dr Monika Ko (Quest Integrity Group) Dr Nick Laycock (Qatar Shell Research & Technology Centre)

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