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Understanding Charge Effects on Marked Ball Wear Rates: a Corrosion Study — Part 2. The Impact of Chromium Content in Media and Dissolved Oxygen

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Abstract

Wear rates of grinding media can be misrepresented by marked ball wear tests (MBWT). Galvanic interactions between dissimilar grinding media can be affected by the chromium content in the media and the presence of oxygen in the environment. Corrosion, one component of wear, can be affected by many variables. Corrosion rates and corrosion potentials for modern high chromium white iron (HCWI) and high carbon steel (HCS) grinding media samples were obtained through electrochemical testing. In this study, the impact of chromium content in the grinding media and the dissolved oxygen in a simulated mill water solution on corrosion rates and potentials was examined. Increasing chromium content in HCWI above 15 weight percent increases the corrosion potential and decreases corrosion rate. Removing most of the oxygen from the solution lowers both the corrosion potential and corrosion rate of the materials tested. The electrochemical results were examined to model possible galvanic coupling effects on corrosion rates. Galvanic coupling between HCS and HCWI could cause differences in corrosion rates for almost all scenarios modeled. Based on the galvanic coupling analysis, MBWT results could be impacted by mixing HCWI and HCS in a ball mill charge. This impact is predicted to be more significant when dissolved oxygen is present in the mill water and as the chromium content of HCWI is above 15 weight percent.

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Acknowledgements

We acknowledge Molycop.

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This research was funded by Molycop.

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  1. Materials Research Center, Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO, 65409, USA

    John Bailey Fletcher & Michael S. Moats

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  1. John Bailey Fletcher
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  2. Michael S. Moats
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Correspondence to John Bailey Fletcher.

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Fletcher, J.B., Moats, M.S. Understanding Charge Effects on Marked Ball Wear Rates: a Corrosion Study — Part 2. The Impact of Chromium Content in Media and Dissolved Oxygen. Mining, Metallurgy & Exploration 40, 49–56 (2023). https://doi.org/10.1007/s42461-022-00711-z

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