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Instruments / Technical Area	Publication Details	Published	Actions
I13-2-Diamond Manchester Imaging I18-Microfocus Spectroscopy	The Effect of Nitrate on Salt Layers in Pitting Corrosion of 304L Stainless Steel Steven Street , W. Xu , M. Amri , Liya Guo , Sarah Glanvill , Paul Quinn , Fred Mosselmans , Joan Vila-comamala , Christoph Rau , Trevor Rayment , Alison Davenport Journal Of The Electrochemical Society 162 (9), C457 - C464 DOI: 10.1149/2.0421509jes Diamond Proposal Number(s): [7414, 8810] Open Access Show Abstract ▼ Abstract: Current oscillations were observed during one-dimensional pitting corrosion of 304 L stainless steel in neutral 1 M NaCl solutions with varying NaNO3 concentrations. Synchrotron X-ray diffraction was used to identify the salt layer at the corrosion front. It was found that, although current oscillations were induced in solutions with higher concentrations of NaNO3, the salt species in the pit did not change and a nitrate-free salt was present in all solutions. At higher NaNO3 concentrations, a change of salt crystal morphology was detected. Electrochemical oscillations were seen to coincide with secondary pitting on the pit surface indicating that two corrosion regimes were operating in parallel. Synchrotron radiography was used on artificial pits to measure the change in corrosion front and material loss in situ. Before nitrate was added, the corrosion front showed non-uniform material loss across the interface when beneath the salt layer. Nitrate addition induced a local region of passivation that propagated across the pit surface. Surface roughness was quantified using R-values and seen to vary without a clear trend until passivation, after which it stayed constant. A mechanism is suggested in which partial passivation occurs in these systems, where passivated areas are undercut as the corrosion front moves, generating surges in current.	Jun 2015

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I13-2-Diamond Manchester Imaging
I18-Microfocus Spectroscopy

The Effect of Nitrate on Salt Layers in Pitting Corrosion of 304L Stainless Steel