Galvanic currents between austenitic and martensitic phases in a microstructure and between pyrrhotite and the two phases were determined directly by measuring galvanic currents and indirectly by using polarization curves under non-abrasive and abrasive conditions in a quartz slurry. A good agreement was found when the corrosion currents measured by electrochemical methods were compared with the corrosion currents estimated from marked ball wear tests. The rates of passive film formation controlled the corrosion currents of the high chromium steel grinding balls in a mill. The passivation kinetics model was proposed by using polarization curves under abrasion at different rotating speeds.

Subject
Wear, Abrasion, Corrosion currents, Passive films, Grinding, Abrasives, Pyrrhotite, Polarization curves, Oxygen, Galvanic current, Electrodes, Austenite, Martensite
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1988
Association for Materials Protection and Performance (AMPP)
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