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

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 v...

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Bibliographic Details
Published in:Minerals & metallurgical processing 2023-02, Vol.40 (1), p.49-56
Main Authors: Fletcher, John Bailey, Moats, Michael S.
Format: Article
Language:English
Subjects:
Chromium
Corrosion effects
Corrosion potential
Corrosion rate
Corrosion tests
Corrosive wear
Coupling
Dissolved oxygen
Engineering
High carbon steels
Impact prediction
Materials Engineering
Media
Metallic Materials
Mineral Resources
Wear rate
Wear tests
White iron
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Summary: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.
ISSN:2524-3462
2524-3470
DOI:10.1007/s42461-022-00711-z