Erosion-Corrosion Mechanisms of Engineering Steels in Different NaCl Concentrations

Brownlie, F. and Hodgkiess, T. and Pearson, A. and Galloway, A. M. (2021) Erosion-Corrosion Mechanisms of Engineering Steels in Different NaCl Concentrations. Journal of Bio- and Tribo-Corrosion, 7. 80. ISSN 2198-4220 (https://doi.org/10.1007/s40735-021-00519-2)

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Abstract

This study utilises a recently developed, enhanced approach to assess detailed aspects of the corrosive wear behaviour of different steel grades in aqueous slurries containing three NaCl concentrations (0.05%NaCl, 3.5%NaCl and 10%NaCl). Erosion-corrosion testing was conducted using a slurry impingement test rig and damage was quantified using volume loss, potentiodynamic polarisation scans and surface topography. Single- and segmented specimens were adopted to yield the contribution of the degradation mechanisms in the two hydrodynamic zones (directly impinged and surrounding area). The overall material losses from the two zones of the stainless steels were observed to increase with increasing salinity. However, the overall material loss for the low-alloy steel was found to increase from 0.05%NaCl to 3.5%NaCl, before reducing when the salinity was further increased to 10%NaCl. Changes in salinity were observed to have the most effect on the corrosion-enhanced mechanical damage mechanism. The in-house developed technique demonstrated good linkage between single samples and the outer area damage region. However, it also showed that the use of single samples can be less successful when assessing highly turbulent (directly impinged) damage regions.

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