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In situ SR-XRD study of FeCO 3 precipitation kinetics onto carbon steel in CO 2 -containing environments: The influence of brine Ph

DOI: 10.1016/j.electacta.2017.09.138 DOI Help

Authors: D. Burkle (Institute of Functional Surfaces, University of Leeds) , R. De Motte (Institute of Functional Surfaces, University of Leeds) , W. Taleb (Institute of Functional Surfaces, University of Leeds) , A. Kleppe (Diamond Light Source) , T. Comyn (Ionix Advanced Technologies) , S. M. Vargas (BP America, Inc.) , A. Neville (Institute of Functional Surfaces, University of Leeds) , R. Barker (Institute of Functional Surfaces, University of Leeds)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Electrochimica Acta

State: Published (Approved)
Published: September 2017
Diamond Proposal Number(s): 12481

Abstract: The growth of iron carbonate (FeCO3) on the internal walls of carbon steel pipelines used for oil and gas transportation can reduce internal corrosion significantly. Solution pH can be considered as one of the most influential factors with regards to the kinetics, morphology and protection afforded by FeCO3 films. This paper presents results from a recently developed in situ Synchrotron Radiation-X-ray Diffraction (SR-XRD) flow cell integrated with electrochemistry for corrosion measurements. The cell was used to follow the nucleation and growth kinetics of corrosion products on X65 carbon steel surfaces in a carbon dioxide (CO2)-saturated 3.5 wt.% NaCl brine at 80 °C and a flow rate of 0.1 m/s over a range of solution pH values (6.3, 6.8 and 7). In all conditions, FeCO3 was identified as the only crystalline phase to form. Electrochemical results coupled with post-test surface analysis indicate that at higher pH, larger portions of the surface become covered faster with thinner, more protective films consisting of smaller, denser and more compact crystals. The comparison between XRD main peak area intensities and FeCO3 surface coverage, mass and volume indicates a qualitative relationship between these parameters at each pH, providing valuable information on the kinetics of film growth.

Journal Keywords: CO2 corrosion; pH; iron carbonate; precipitation; synchrotron; X-ray diffraction

Subject Areas: Chemistry, Engineering

Instruments: I15-Extreme Conditions