Synthesis and Application of the Mbt Loaded Mof-Ldh@Rgo Nano-Composite For Mild Steel Corrosion Mitigation in Simulated Seawater Solution

Reduced-graphene oxide (rgo) has drowned significant consideration of the corrosion scientists due to its massive surface area, and excellent barrier performance against ions, water, and oxygen diffusion. because of these, it has been widely applied as an effective barrier nano-filler in the development of polymeric anti-corrosion systems i.e. epoxy. despite the excellent barrier activity, it could not provide active protection in case of coating damage. to overcome these, researchers have tried to directly load corrosion inhibitors, i.e. organic, inorganic, or the mix of them, on the go/rgo sheets' surfaces. although this approach has resulted in some success in the improvement of the nanosheets' active corrosion inhibition properties, the limited inhibitor adsorption capacity of go/rgo and the uncontrollable/un-intelligent release features are still the major challenges of their usage in the coating matrix. so, in this study, for the first time, rgo nanosheets were modified by well-known nanocarriers based on layer double hydroxide (ldh) and metal-organic framework (mof) for achieving a highly durable anti-corrosion agent with high inhibitor loading capacity and smart release activity. for this purpose, first, go nanosheets were obtained via modified hummer's method, and then reduce to obtain rgo. in the next step, zn-al-ldh plates were synthesized on the rgo sheets by a co-precipitation method. then, the rgo-zn-al-ldh surface was decorated by a zif-8 type mof. 2-mercaptobenzimidazole (mbt) was loaded into rgo-zn-al-ldh-mof nanocarrier and then characterized by ft-ir, xrd, raman, and uv-visible analysis. the corrosion inhibitor release and anti-corrosion ability of the rgo-zn-al-ldh-mof@mbt were investigated in the solution phase, 3.5 wt.% nacl solution, over mild steel by eis and polarization tests. results proved the improvement of the steel corrosion resistance in the nacl solution containing rgo-zn-al-ldh-mof@mbt extract as a function of immersion time due to the release of mbt from the nanocarrier and adsorption on the steel anodic sites and also the hydroxyl and chloride ions elimination from the solution by an ion-exchange mechanism of the mentioned anions with the ldh interlayer nitrate anions.

Synthesis and application of the MBT loaded MOF-LDH@rGO nano-composite for mild steel corrosion mitigation in simulated seawater solution

Reduced-graphene oxide (rGO) has drowned significant consideration of the corrosion scientists due to its massive surface area, and excellent barrier performance against ions, water, and oxygen diffusion. Because of these, it has been widely applied as an effective barrier nano-filler in the development of polymeric anti-corrosion systems i.e. epoxy. Despite the excellent barrier activity, it could not provide active protection in case of coating damage. To overcome these, researchers have tried to directly load corrosion inhibitors, i.e. organic, inorganic, or the mix of them, on the GO/rGO sheets' surfaces. Although this approach has resulted in some success in the improvement of the nanosheets' active corrosion inhibition properties, the limited inhibitor adsorption capacity of GO/rGO and the uncontrollable/un-intelligent release features are still the major challenges of their usage in the coating matrix. So, in this study, for the first time, rGO nanosheets were modified by well-known nanocarriers based on layer double hydroxide (LDH) and metal-organic framework (MOF) for achieving a highly durable anti-corrosion agent with high inhibitor loading capacity and smart release activity. For this purpose, first, GO nanosheets were obtained via modified Hummer's method, and then reduce to obtain rGO. In the next step, Zn-Al-LDH plates were synthesized on the rGO sheets by a co-precipitation method. Then, the rGO-Zn-Al-LDH surface was decorated by a ZIF-8 type MOF. 2-Mercaptobenzimidazole (MBT) was loaded into rGO-Zn-Al-LDH-MOF nanocarrier and then characterized by FT-IR, XRD, Raman, and UV-visible analysis. The corrosion inhibitor release and anti-corrosion ability of the rGO-Zn-Al-LDH-MOF@MBT were investigated in the solution phase, 3.5 wt.% NaCl solution, over mild steel by EIS and polarization tests. Results proved the improvement of the steel corrosion resistance in the NaCl solution containing rGO-Zn-Al-LDH-MOF@MBT extract as a function of immersion time due to the release of MBT from the nanocarrier and adsorption on the steel anodic sites and also the hydroxyl and chloride ions elimination from the solution by an ion-exchange mechanism of the mentioned anions with the LDH interlayer nitrate anions.