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Architectural optimization of an epoxy-based hybrid sol–gel coating for the corrosion protection of a cast Elektron21 magnesium alloy

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Academic year: 2021

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Fig. 1. SEM image of the cast magnesium alloy after acid etching with 20 g/L of HNO 3 : (a) surface of the substrate; (b) cross-section (mode BSE); (c) EDX analyze for zirconium.
Fig. 4. Bode diagrams of the EIS spectra obtained for the bare magnesium substrate, and covered by the monolayer hybrid coating (M), after 1 h (a), 24 h (b) and 168 h (c) of immersion in a 0.05 M NaCl solution.
Fig. 5. SEM images of the cross-section of the bilayer hybrid coatings A–D.
Fig. 7. SEM images of the surface of the bilayer hybrid coatings A–D.
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