Abstract
Synergistic effect between corrosion and wear has been widely recognized in many tribo-corrosion systems. In most wet application conditions, dissolved oxygen (DO) is a controlling factor to the dynamics of corrosion process and is therefore expected to have significant impact on the tribo-corrosion performance of materials. In this study, the effect of DO (0–24 ppm) on erosion–corrosion behaviour of En30B low-alloy steel has been investigated using a slurry pot erosion–corrosion test apparatus in a slurry containing 35 wt% silica sand and 3.5% NaCl solution at 30 and 45 °C. The synergistic effect and its contributing components, i.e. erosion-enhanced corrosion and corrosion-enhanced erosion, have been measured/analysed. The total erosion–corrosion loss and synergy of the En30B steel increases with DO in the slurry, initially rapidly at DO levels below ~5 ppm and then less rapidly at the higher DO levels. The synergistic effect is mainly due to corrosion-enhanced erosion with negligible contributions from erosion-enhanced corrosion. Temperature has a significant effect on the total erosion–corrosion loss. Total erosion–corrosion was 34% higher at 45 °C (in still air) than at 30 °C. Mechanisms for the observed phenomena have been discussed based on the concept of corrosion-accelerated micro-crack propagation.
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Acknowledgements
The authors would like to acknowledge members of the NRC/Industry Mining Wear Materials Consortium for their support and sponsorship of this work and express their thanks to Baisheng (Peter) Yao at the Mining Wear and Corrosion Lab for his technical assistance in conducting the experimental work.
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Jiang, J., Xie, Y., Islam, M.A. et al. The Effect of Dissolved Oxygen in Slurry on Erosion–Corrosion of En30B Steel. J Bio Tribo Corros 3, 45 (2017). https://doi.org/10.1007/s40735-017-0105-0
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DOI: https://doi.org/10.1007/s40735-017-0105-0