Self-healing ceria-modified coating for corrosion protection of AZ31
A hybrid siloxane-based coating was modified with CeO2 nanoparticles and applied on AZ31 magnesium alloy.
The corrosion protection performance was evaluated via Electrochemical Impedance Spectroscopy (EIS) in 0.05 M NaCl. CeO2-modified coating showed improved and more stable protective performance compared to the blank coating. Localised healing of the modified coating was studied via Scanning Vibrating Electrode Technique (SVET), Scanning Ion-Selective Electrode Technique (SIET) and Localised Electrochemical Impedance Spectroscopy (LEIS).
Pre-emptive healing of localised corrosion activity
Addition of ceria led to lower cathodic activity in 0.05 M NaCl and alkalisation was kept localised. The CeO2-modified coating provided corrosion protection, including pre-emptive healing of localised corrosion activity, of AZ31.
The study is published in: Corrosion Science Volume 142, September 2018, Pages 12-21.
