Silicon oxide multilayer coatings doped with carbon nanotubes and graphene nanoplatelets for corrosion protection of AZ31B magnesium alloy

Anticorrosion and Cytocompatibility Assessment of Graphene-Doped Hybrid Silica and Plasma Electrolytic Oxidation Coatings for Biomedical Applications

“…Table lists the composition of the different sols. The composition of the sol–gel was selected in previous laboratory tests …”

“…First, the sol–gel synthesis route was followed to generate compact and homogeneous hybrid silica coatings from two silicon alkoxides. 32 , 37 − 40 In this case, the samples were coated by the dip-coating method. Second, coatings were generated through the PEO method.…”

“…Regarding nanoparticles, different studies can be found in the literature regarding graphene nanoplatelets (GNPs) being used as nanofillers for enhancing the corrosion and wear protection of coatings deposited on metallic substrates. , However, the biocompatibility of GNPs generates controversy. Some studies claim that the interaction between GNPs and cells leads to cell damage.…”

“…In this research, two different methods were used to generate biocompatible anticorrosion protective coatings. First, the sol–gel synthesis route was followed to generate compact and homogeneous hybrid silica coatings from two silicon alkoxides. ,− In this case, the samples were coated by the dip-coating method. Second, coatings were generated through the PEO method. ,, In this case, the coating grows on the surface of the metallic substrate immersed in an electrolyte due to microdischarges occurring on the surface of the sample, generating an anodic oxide layer that contains elements present in the electrolyte.…”

Review of Recent Developments in the Formulation of Graphene-Based Coatings for the Corrosion Protection of Metals and Alloys

“…This multilayer was shown to provide good corrosion protection to the underlying aluminium alloy substrate. Multilayer graphene-modified sol-gel coatings have also been employed to protect magnesium alloys [208] and in this case a comparative study on the performance of sol-gels modified with carbon nanotubes (CNTs) and COOH-functionalised graphene showed that the graphene-containing sol-gels were superior, inhibiting the transport of Cl − to the surface of the substrate.…”