Abstract:A superhydrophobic ceria‐based composite coating is developed to improve anticorrosion properties of AZ61 magnesium alloy, fabricating via chemical conversion method followed by hydrothermal treatment. The cerium conversion coating has a block structure with microcracks. After the hydrothermal treatment, a dense CeO2 layer, porous CeO2 nanorods, and stearic absorbing layers are grown stepwise on the conversion coating. And the composite coating is hydrophobic or even superhydrophobic and has almost no microcra… Show more
“…Furthermore, as the superhydrophobic layer on the composite coating had a resistance of 4.405 × 10 4 Ω·cm 2 , it was apparent that the corrosion resistance of the SNC sample was better than that of the FC sample (2.805 × 10 4 Ω·cm 2 ). This could therefore be used as a shield layer and effectively prevent the penetration of electrolytes [34]. Figure 10 Equivalent circuit for electrochemical impedance spectra of samples for (a) BS and FC sample (b) SNC sample.…”
The two-step dipping technique was used to fabricate anti-corrosive fluorocarbon paint (FP)/ SiO 2 superhydrophobic coatings on the surfaces of aluminium alloy substrates. In order to characterise the surface microtopography, chemical element and groups, hydrophobicity, and corrosion performance of these prepared coatings, we employed a scanning electron microscope (SEM) and X-ray photoelectron spectrometer (XPS) as well as performing electrochemical experiments. Coating adhesion was reflected by the scotch-tape test. The coatings had a micron-nanometre hierarchical structure, and their surface morphologies were strongly dependent on the silica nanoparticle concentration. The superhydrophobicity of the coating was correlated with its microstructure and composition. The electrochemical experiments revealed that the obtained coating could enhance the corrosion performance of the underlying Al alloy substrates.
“…Furthermore, as the superhydrophobic layer on the composite coating had a resistance of 4.405 × 10 4 Ω·cm 2 , it was apparent that the corrosion resistance of the SNC sample was better than that of the FC sample (2.805 × 10 4 Ω·cm 2 ). This could therefore be used as a shield layer and effectively prevent the penetration of electrolytes [34]. Figure 10 Equivalent circuit for electrochemical impedance spectra of samples for (a) BS and FC sample (b) SNC sample.…”
The two-step dipping technique was used to fabricate anti-corrosive fluorocarbon paint (FP)/ SiO 2 superhydrophobic coatings on the surfaces of aluminium alloy substrates. In order to characterise the surface microtopography, chemical element and groups, hydrophobicity, and corrosion performance of these prepared coatings, we employed a scanning electron microscope (SEM) and X-ray photoelectron spectrometer (XPS) as well as performing electrochemical experiments. Coating adhesion was reflected by the scotch-tape test. The coatings had a micron-nanometre hierarchical structure, and their surface morphologies were strongly dependent on the silica nanoparticle concentration. The superhydrophobicity of the coating was correlated with its microstructure and composition. The electrochemical experiments revealed that the obtained coating could enhance the corrosion performance of the underlying Al alloy substrates.
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