Fabrication of dual anti-corrosive polyaniline microcapsules via Pickering emulsion for active corrosion protection of steel

• DOI: 10.1039/d2sm00062h
• Publication Date: 2022-03-15T12:29:14Z
• Authors: Weihao Pan; Jiahao Dong; Taijiang Gui; Ren Liu; Xiaoya Liu; Jing Luo
• Keywords: Pickering emulsion; Salt spray test; Emulsion polymerization

A novel kind of inhibitor-loaded polyaniline (PANI) microcapsule was prepared by Pickering emulsion photopolymerization using particles as the emulsifier. In our strategy, water-dispersible nanoparticles were firstly synthesized a micelle template method and used to stabilize oil-in-water emulsions, in which oil phase contained photo-crosslinkable pH sensitive monomers photo-initiator. Under UV light, pH-responsive underwent photo-polymerization crosslinking converted shells. During this process, trapped shells, leading formation PANI microcapsules. The structure morphology microcapsules analyzed FTIR spectroscopy, SEM, EDX mapping. inhibitor (mercaptobenzothiazole, MBT) subsequently incorporated into functional core demonstrated pH-sensitive releasing behavior. With anti-corrosive wall MBT core, as-prepared loaded (MBT@PANI) could afford dual corrosion protection, allowing smart protection metals when exposed corrosive conditions. MBT@PANI embedded UV-cured coating for protecting steel. performance with evaluated electrochemical impedance spectroscopy technique salt spray test, synergistic inhibition effect improving anti-corrosion coating.