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Effect of mixed salts on atmospheric corrosion of 304 stainless steel

DOI: 10.1149/2.0021911jes DOI Help

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

Type: Journal Paper
Journal: Journal Of The Electrochemical Society , VOL 166 , PAGES C3010 - C3014

State: Published (Approved)
Published: January 2019
Diamond Proposal Number(s): 7412

Open Access Open Access

Abstract: Atmospheric corrosion of stainless steel can take place when airborne salt particles deposit on the metal surface, forming droplets when the relative humidity (RH) reaches a critical value: the deliquescence relative humidity of the salt. Most work to date has focused on single salts such as MgCl2 or NaCl. In the present work, the effect of mixed salts is investigated at 45% RH, above the deliquescence relative humidity of MgCl2 but below that of NaCl. Dish-shaped pits were found in pure MgCl2 solutions and mixed solutions. Crevice corrosion takes place under NaCl crystals. This is shown both with ex situ measurements and in situ time-dependent measurements using X-ray microtomography, where pit growth was also monitored.

Journal Keywords: Corrosion; Atmospheric corrosion; Stainless steel; X-ray diffraction

Subject Areas: Materials

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