Anti-corrosion coatings with active and passive protective performances based on v-COF/GO nanocontainers

Reduced Graphene Oxide Nanoplatelets Functionalized with Nonpolar Aliphatic Groups for High-Performance Coatings against Corrosion

“…The polarization resistance for Propyl-rGO showed stable values of 3.7 × 10 8 Ω/cm 2 (Table ), 4 orders of magnitude higher than the values obtained for the neat epoxy. It is worth highlighting that, according to the results obtained from PCCs, the use of an aliphatic-functionalized GO allows competitive nanocomposite coatings in comparison with the coatings reported in the literature using graphene, GO, rGO, polar functionalized GO, ,− polar functionalized rGO, among others, − as shown in Figure c. Nevertheless, when the aliphatic-functionalized GO was structurally restored (elimination of the oxidized carbon species), a high-performance nanocomposite material against corrosion for A36SS in a saline medium was obtained.…”

Eco-Friendly Sustainable and Responsive High-Performance Benzotriazole-Metal Organic Frameworks/Silica Composite Coating with Active/Passive Corrosion Protection on Copper

“…The passive protective effect is that the superhydrophobicity of the SiO 2 coatings prevents corrosive ions, water, and oxygen from penetrating into the coating. Thus, it can prevent metal from corrosion and effectively slow down the anodic reaction on the metal surface C u − 2 e − = normalC normalu 2 + As the immersion time of the coating in 3.5 wt % NaCl solution increases, the passive protection effect gradually weakens, and the electrolyte diffuses toward the coating. For SiO 2 , UiO-66/SiO 2 , and Cu-MOFs/SiO 2 coatings, the SiO 2 particles and MOF fillers can improve the anticorrosion ability of copper due to the labyrinth effect, while the corrosive species penetrate through the coating after long-term immersion tests, resulting in damage of the coating, as confirmed by electrochemical results and characterizations of surface morphologies and chemical compositions.…”

“…As the corrosion reaction increases, it causes changes in pH − gradient and Cl – concentration, triggering in the release of the preloaded BTA inhibitor from the nanocontainers. Corrosion inhibitor reacts with copper via the following equation , C u + B T A = C u ( Ι ) − B T A Thus, it can form a dense oxide film on copper, which plays an active protective effect and slows down the corrosion reaction of copper C u + 2 H 2 normalO + O 2 = 2 C u false( normalO normalH false) 2 2 C u false( normalO normalH false) 2 + normalC normalO 2 = C u false( normalO normalH false) 2 normalC normalO 3 + H 2 normalO Therefore, the loading of BTA inhibitor and the impermeability of BTA-MOFs/SiO 2 coatings can greatly suppress the electrochemical corrosion reactions, thereby realizing the active/passive protection and providing stable corrosion resistance in 3.5 wt % NaCl solution.…”

“…The passive protective effect is that the superhydrophobicity of the SiO 2 coatings prevents corrosive ions, water, and oxygen from penetrating into the coating. Thus, it can prevent metal from corrosion and effectively slow down the anodic reaction on the metal surface 53…”

“…As the corrosion reaction increases, it causes changes in pH 54−56 gradient and Cl − concentration, triggering in the release of the preloaded BTA inhibitor from the nanocontainers. Corrosion inhibitor reacts with copper via the following equation57,58 + = Cu BTA Cu( ) BTA(5)Thus, it can form a dense oxide film on copper, which plays an active protective effect and slows down the corrosion reaction of copper53…”