Assessing the tribocorrosion behaviour of Cu and Al by electrochemical impedance spectroscopy

This study is focused on the interests and limits of Electrochemical Impedance Spectroscopy, to establish the electrochemical behaviour of a tribosystem between Cu and Al, in acid solution. The calculated capacitance, in high-frequency range, partially allows understanding the double layer state of body in the contact. The Potential of Zero Charge (PZC) was calculated for Cu sample and it was associated with a potential range for Al. PZC value of each material is discussed as a key parameter of sliding contact. During tests of wear, the EIS results are related to the evolution of adsorbed water molecules.