193.174.19.232Abstract: L. Dzib-Perez, C. Granja-Banguera, J. Ortiz-Corona, G. Canto, J. Henao, C. Poblano-Salas, A. Giraldo-Betancur, J. Gonzalez-Sanchez (2025)

Surface and Coatings Technology, 511, 132275p. (2025) DOI:10.1016/j.surfcoat.2025.132275

The performance of a HVOF-deposited HAp-bioactive glass composite coating on AZ31 alloy to reduce the corrosion rate in simulated body fluid: Assessment scanning electrochemical microscopy and electrochemical noise

L. Dzib-Perez, C. Granja-Banguera, J. Ortiz-Corona, G. Canto, J. Henao, C. Poblano-Salas, A. Giraldo-Betancur, J. Gonzalez-Sanchez

This investigation evaluated the electrochemical behaviour of an AZ31 alloy surface coated by HVOF-sprayed hydroxyapatite and bioactive glass in simulated body fluid (SBF) to control its corrosion rate. A home-made melt-quenched S53P4 (4 wt% P2O5, 20 wt% CaO, 39.38 wt% Na2CO3, and 53 wt% SiO2) bioactive glass powder and commercial hydroxyapatite (HAp) powder were mechanically mixed in a proportion of 75/25 wt% (HAp/S53P4 BG) for the preparation of a powder mixture employed in the manufacture of the coatings. The composite coatings were deposited under two air cooling conditions which influence their corrosion resistance. The corrosion protection performance of the system AZ31-coating in SBF at 37 °C was evaluated using scanning electrochemical microscopy (SECM) and electrochemical noise (EN). SCEM line and map measurements indicate more intense H2 evolution during the initial periods of immersion with one of the coatings providing reduction of the H2 evolution during the initial periods of immersion. Direct examination of the current and potential time series, statistical analysis and recurrence plots were applied to the EN data. For short immersion periods, the coatings successfully reduced the dissolution of the Mg alloy and the hydrogen evolution; however, for longer immersion times the coating's protection was very limited. The EN analysis of the surface behaviour of AZ31 samples with and without coatings allowed determining complex dynamic changes in the system with a predominant mixed corrosion form (localised and uniform corrosion) for long immersion periods.

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