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.
Cesium-137 (Cs(I)) is highly hazardous in low-level wastewater
and is a major problem in low-level nuclear wastewater. Its effective
removal from contaminated wastewater is crucial to ensuring environmental
safety and public health. In this study, cesium ion-imprinted composite
membranes (I-DBC) were developed for selective separation of Cs(I)
using dopamine modification and ion-imprinting techniques. Bacterial
cellulose (BC) was used as a carrier in the membrane matrix, and the
adsorption capacity of the material was greatly improved after hydrophilic
dopamine mimetic bonding and ion blotting techniques. Rapid and highly
selective adsorption of cesium ions from low concentration nuclear
energy wastewater was realized. The researchers conducted both static
and dynamic adsorption experiments on Cs(I) to evaluate the performance
of the I-DBC composite membranes. The results showed that the I-DBC
composite membrane was more compatible with the Langmuir model and
adsorbed Cs(I) mainly by chemical monolayer adsorption, with a maximum
adsorption capacity of 50.016 mg g–1 under optimal
conditions. In low concentration wastewater, the maximum adsorption
capacity of the I-DBC was 4.093 mg g–1. Furthermore,
during dynamic permeation experiments, the breakthrough point of the
I-DBC was approximately 20 min. The membrane demonstrated good flux
properties, which underscores its potential for practical application
in the treatment of nuclear wastewater. The findings suggest that
the I-DBC composite membrane holds promising prospects for the efficient
removal of cesium ions from contaminated water, contributing to safer
and more effective nuclear wastewater management.
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