Tribocorrosion at metal-on-metal contacts: The contributing role of geometry and material combination

Advancements in Modelling the Tribocorrosion Current

“…It should be noted that the contact radius might be affected by the sliding velocity. [10] Overall, one can see that the current models are closely linked together and under specific situations, one could be derived from the other. The models discussed above formulate the current under potentiostatic conditions.…”

“…Figure 3 illustrates the decomposition of the experimental current during a rubbing stroke (green line) to the partial roles emitted from the disk (blue line) and ball (red line) in a Ti-on-CoCr contact tested at 5 Hz. [10] This figure demonstrates that the partial role of the disk is much more significant compared with that from the ball. These partial roles and the associated current dominance were shown to be strongly dependent on the contacting materials and sliding frequency.…”

“…[33,34] In return, oxide film starts to re-establish quickly for restoring initial equilibrium. [1,10,24,25,35,36] Therefore, models for capturing the tribocorrosion current require to incorporate mechanical abrasion, electrochemical parameters, and the passivation kinetics of the base metal. This current is used in the mechanistic approach to quantify the wear-accelerated corrosion.…”

“…These partial roles and the associated current dominance were shown to be strongly dependent on the contacting materials and sliding frequency. [10] Although being useful and informative, this model was shown to have a number of limitations, as detailed in- [10,35] For instance, all the passivation kinetics and mechanical properties of the oxide film are time dependent. This dynamic nature requires to be somehow incorporated in a tribocorrosion current model.…”

“…[1,[4][5][6][7] One important parameter in the mechanistic approach is to capture the tribocorrosion current emitted from the passive metal. [3,[8][9][10] The current originates from passivation and dissolution processes. [11][12][13][14] Passivation is a spontaneous reaction from the metal to the aqueous/gaseous environment to protect the underlying metal from further chemical degradation.…”