This article aims to develop CeO 2 nanocontainer-constructed coating with a synergistic self-healing and protective nature through a simple mechanical blending technique to manage metal corrosion. The proposed coating exhibits excellent corrosion resistance, which is primarily attributed to the combination of thermal-driven healing and active corrosion inhibition. Paraffin wax and 2-polybenzothiazole-loaded CeO 2 nanotubes (CeO 2 -MBT) are directly doped into epoxy coating to perform such a multifunctional role. CeO 2 nanocontainers and encapsulated corrosion inhibitor MBT can be released by pH triggers to achieve instant corrosion inhibition upon the surface of metal substrate. In addition, any physical defects in the coating are responsively repaired by heating incorporated paraffin wax to regain structural integrity and consequent barrier function. Corrosion protection efficiency remains sufficient even after ten cycles of damage and healing. Such a multiple-functional coating strategy provides an alternative pathway toward efficient and sustainable performance to tackle corrosion-related challenges of metal components in both short-term and long-term services.
Jingxia Yang,Bingjie Zou,Qing Fang,Jinjie Wang,Lidong Wang
To figure out the behavior of benzotriazole (BTA) loaded in CeO 2 nanocontainers during long term anticorrosion, three kinds of CeO 2 spheres were used: hollow spheres ( HS s), double-shell hollow spheres ( DHS s), and solid-mesoporous spheres ( SS s). The BTA loading and releasing situations were checked, and CeO 2 - HS s exhibited the largest BTA loading amount of 12.5 wt%, forming by both chemical and physical adsorption. The highest BTA loading in CeO 2 - HS s may be attributed to its hollow structure and more Ce 3+ sites (39 %) for BTA anchoring. Thus, CeO 2 - HS s@BTA exhibited an excellent long-term anticorrosion in epoxy coating for low carbon steel protection, showing no rusting after 40 days of salt spray experiment.
Water-based epoxy coating containing CeO 2 nanocontainers was successfully applied on carbon steel for corrosion protection. CeO 2 nanocontainers were loaded with the corrosion inhibitor benzotriazole (BTA). Polyelectrolyte multilayers were deposited on the loaded nanocontainers by layer-by-layer assembly method. Responsive release of BTA molecules were studied in water media at different pH values using UV–vis spectroscopy. The anticorrosive performance of the epoxy coatings doped with 0.5 wt% of smart nanocontainers was tested by immersion of the coated carbon steel in 0.5 M NaCl solution. Electrochemical impedance spectroscopy (EIS) was used to estimate the influence of smart nanocontainers on the passive corrosion resistance. The self-healing performance of the coating with modified CeO 2 nanocontainers was studied by scanning Kelvin probe (SKP). From results of EIS and SKP , the addition of pH-sensitive nanocontainers into the epoxy resin inhibited the corrosion activities on the metal surface, showing a promising strategy for developing water-based epoxy coatings with long term protection performance.
危险品化学品经营许可证（带存储）