Characterisation of salt films on dissolving metal surfaces in artificial corrosion pits via in situ synchrotron X-ray diffraction |
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| Affiliation: | 1. School of Chemistry, The University Chemical Laboratory, University of Birmingham, Lensfield Road, Edgbaston, Birmingham B15 2TT, UK;2. Department of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;3. Diamond Light Source Ltd., Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK;4. STFC, Daresbury Laboratory, Warrington, Cheshire WA4 4AD, UK |
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| Abstract: | The salt films formed on metal surfaces dissolving inside artificial corrosion pits formed in 1 M HCl have been probed with synchrotron X-ray diffraction. NiCl2 · 6H2O is the main phase in the salt film on nickel, whereas salt films on both iron and 316 L stainless steel are predominantly FeCl2 · 4H2O. However, the salt film on iron has a very fine homogeneous crystallite size whereas that on stainless steel is much coarser. The potential-dependence of the film formed on iron has been determined. |
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