Abstract
The effect of repassivation on tribocorrosion behaviour of two multilayer coatings of different structures is studied experimentally by measuring the variation of instantaneous open-circuit potential during friction. One coating consists of alternating Cr and CrN layers, while another consists of alternated layers of CrN and ZrN. Analysis of the results showed that friction force, i.e. the rate of the mechanical energy supplied to the material in the contact zone, has no direct influence on the tribocorrosion behaviour; however, the wear rate does strongly influence the tribocorrosion. A simple phenomenological model of repassivation of the multilayer coating is developed assuming “surface coverage” approach. This model establishes the relationship between the rate of mechanical activation of material by friction and the behaviour of the open-circuit potential.
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Acknowledgements
The authors acknowledge the financial support received from the Spanish National Department of Education and Science through the following projects: CSD2008-00323 FUNCOAT in frames of CONSOLIDER INGENIO-2010 Spanish programme; MAT2005-07872 NANOTRIBOCOR in frames of the National Programme on Materials Research.
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Bayón, R., Nevshupa, R., Zubizarreta, C. et al. Characterisation of tribocorrosion behaviour of multilayer PVD coatings. Anal Bioanal Chem 396, 2855–2862 (2010). https://doi.org/10.1007/s00216-010-3538-6
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DOI: https://doi.org/10.1007/s00216-010-3538-6