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Wednesday, 20 February 2019
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Raw materials & technologies, Applications

Self-healing ceria-modified coating for corrosion protection of AZ31

Tuesday, 22 January 2019

A hybrid siloxane-based coating was modified with CeO2 nanoparticles and applied on AZ31 magnesium alloy.

Magnesium alloys are used, for example, in automotive engineering. Source: tournee – stock.adobe.com.

Magnesium alloys are used, for example, in automotive engineering. Source: tournee – stock.adobe.com.

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.

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