The objective of this study is to develop novel and sustainable corrosion inhibitors, which is an important and challenging task in corrosion management. This study involved the fabrication of a novel nanocomposite (NC) via the cumin-derived carbon dots (CD) mediated functionalization of an iron metal-organic framework (MOF). The MOF@CD NC was tested as a novel corrosion inhibitor for Q235B steel in 1.0 M HCl solution. The anticorrosive potential was significantly improved through the functionalization process and gravimetric tests showed an inhibition efficiency of about 98% after 72 h immersion at 25 °C with an inhibitor concentration of 100 mg/L. FT-IR and XPS analysis indicated that binding and adsorption were achieved through functional groups of MOF@CD NC. SEM and AFM studies showed significant surface damage reduction and supported the formation of a powerful protective layer in the presence of inhibitor. This research represents a significant step forward in corrosion protection technology by introducing a new class of materials with excellent performance at low concentrations, offering a promising solution for industrial applications.
Utilizing the oxide layer of carbon steel as an anti-corrosion protective layer is an environmentally friendly and cost-effective strategy. In this paper, a novel pressure swing oxidation (PSO) method was used to fabricate an oxide layer on the surface of Q235B, and the limiting effect of PSO on oxidation was presented using a reactive force field (ReaxFF). The surface characteristics and corrosion resistance of the oxide layers formed at varying temperature, as well as the different stage of PSO were investigated, and the formation mechanism of the oxide layer was discussed in detail. It can be found that the PSO process intensively affects the thickness, morphology and surface roughness along with phase composition of the oxide layers, which further influences the corrosion resistance. After the oxidation treatment, the corrosion current density of the treated sample was 3.31 × 10 −7 A·cm −2 which was reduced by about one order of magnitude in comparison with untreated Q235B. At the same time, an ultra-long passivation zone appeared in the corresponding polarization curve. Moreover, the impedance modulus at 0.01 Hz reached 1.29 × 10 6 Ω·cm 2 .
危险品化学品经营许可证（带存储）