K3-en / PhysChemLabCorrConvCoatingsRight

Research programme


Corrosion protection

In the field of corrosion protection our research is focused on the following topics:


Conversion coatings

Conversion coatings can be defined as coatings formed by conversion from soluble salt to a slightly soluble or insoluble oxide and/or hydroxide which precipitates either throughout the metal surface, or at intermetallic particles which are electrochemically more noble in respect to surrounding matrix and where oxygen reduction takes place. Inhibitory action of these conversion coatings is based on the retardation of cathode reaction (i.e. oxygen evolution) on corroding surfaces. Today three main types of conversion coatings are being explored on aluminium alloys: rare earth coatings, zirconium and/or titanium coatings and trivalent chromium coatings:



Figure: (a) Polarization curves recorded for aluminium alloy AA7075-T6 in 0.1 M NaCl solution with and without added 3 mM cerium(III) nitrate, chloride and acetate salts. Corrosion potential (Ecorr), pitting potential (Epit) and the span of passivity region (∆E) are denoted. dE/dt=1 mV/s. (b) Confocal microscope images of artificially made scratch on AA7075-T6 after 72 h immersion in 0.1 M NaCl and 0.1 M NaCl with added 3 mM CeCl3 and 3 mM Ce(Ac)3. (Reprinted from the publication by I. Milošev, P. Rodič, Corrosion, 2016, 72, 1021–1034)

Conversion coatings: selected publications

  1. I. Milošev, P. Rodič, J. Electrochem. Soc., 2022, 169, 011504-1–011504-17.

  2. I. Milošev, B. Kapun, P. Rodič, J. Electrochem. Soc., 2022, 169, 91501-1–091501-21.

  3. P. Rodič, I. Milošev, Studia UBB Chemia, 2020, LXV, 227–244.

  4. G. Šekularac, I. Milošev, J. Electrochem. Soc.,2020, 167, 021509

  5. G. Šekularac, J. Kovač, I. Milošev, Corros. Sci.,2020, 169, 1086151

  6. B. Volarič, A. Manzare, S. Virtanen, I. Milošev, Corrosion, 2020,76, 18–38

  7. P. Rodič, I. Milošev, M. Lekka, F. Andreatta, L. Fedrizzi, Electrochim. Acta, 2019, 308, 337–349.

  8. P. Rodič, I. Milošev, Corros. Sci., 2019, 149, 108–122.

  9. M. Mujdrica Kim, B. Kapun, U. Tiringer, G. Šekularac, I. Milošev, Coatings, 2019, 9, 563

  10. I. Milošev, G.S. Frankel, J. Electrochem. Soc., 2018, 165, C1–C18.

  11. I. Milošev, B. Volarič, Corrosion, 2017, 73, 822–843.

  12. B. Volarič, I. Milošev, Corr. Eng. Sci. Technol., 2017, 52, 201–211.

  13. P. Rodič, I. Milošev, J. Electrochem. Soc., 2016, 163, C85–C93.

  14. I. Milošev, P. Rodič, Corrosion, 2016, 72, 1021–1034.

Projects related to conversion coatings