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The effect of relative humidity change on atmospheric pitting corrosion of stainless steel 304L

DOI: 10.1016/j.corsci.2019.01.033 DOI Help

Authors: Liya Guo (University of Birmingham; Imperial College London) , Steven Street (University of Birmingham) , Haval B. Mohammed-ali (University of Birmingham) , Majid Ghahari (University of Birmingham) , Na Mi (University of Birmingham) , Sarah Glanvill (University of Birmingham) , Andrew Du Plessis (University of Birmingham) , Christina Reinhard (Diamond Light Source) , Trevor Rayment (Diamond Light Source) , Alison Davenport (University of Birmingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Corrosion Science

State: Published (Approved)
Published: January 2019
Diamond Proposal Number(s): 8334

Abstract: Relative humidity fluctuations tend to influence atmospheric corrosion under natural exposure conditions. In this study, the effect of change in relative humidity on pitting corrosion of stainless steel under MgCl2 droplets is investigated with in situ X-ray microtomography and optical microscopy. Relative humidity fluctuations (between 33% RH and 85% RH or between 33% RH and 12% RH) tend to lead to nucleation of many small pits whereas continuous exposure at constant 33% RH leads to growth of a single pit. This indicates that natural fluctuations in relative humidity might be beneficial for preventing the growth of a large penetrating pit.

Journal Keywords: Atmospheric pitting corrosion; Wet-dry cycling; Stainless steel; X-ray microtomography

Subject Areas: Materials


Instruments: I12-JEEP: Joint Engineering, Environmental and Processing