The effect of dissolved oxygen in slurry on erosion-corrosion of En30B steel

Jiang, Jiaren and Xie, Yongsong and Islama, Md. Aminul and Stack, M. M. (2017) The effect of dissolved oxygen in slurry on erosion-corrosion of En30B steel. Journal of Bio- and Tribo-Corrosion, 3. 45. ISSN 2198-4220

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    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 35wt% silica sand and 3.5% NaCl solution at 30°C 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.