ZnPA@ZIF-8 nanoparticles: Synthesis, sustained release properties and anticorrosion performance

Zeolitic imidazolate framework-8 (ZIF-8) has attracted extensive attention in many different fields because of its advantages such as small size, ordered channels, adjustable structure, large specific surface area and simple synthesis. In this paper, zinc phytate (ZnPA) as single metal source and 2-methylimidazole (2-MI) as ligand were creatively used to synthesize [email protected] nanoparticles by a one-step process. ZnPA and 2-MI are both green and environmentally friendly corrosion inhibitors. In addition, Zn2+ in ZnPA can coordinate with 2-MI to produce ZIF-8, leading to anchor and encapsulate of ZnPA on ZIF-8. Thus, the design of [email protected] nanoparticles is of significance for anticorrosion of metal. Furthermore, the introduce of [email protected] nanoparticles into waterborne polyacrylate (WPA) was reported for the first time and an in depth study of anticorrosion performance and mechanism of WPA/[email protected] composite coating were conducted. The results showed that [email protected] nanoparticles were triumphantly fabricated. Moreover, [email protected] nanoparticles could be dissolved and successfully released the ZnPA under the stimulation of salt solution. WPA/[email protected] composite coating exhibited prominent corrosion resistance, compared with WPA coating, WPA/ZnPA composite coating and WPA/ZIF-8 composite coating. The impedance modulus at 10−2 Hz of WPA/[email protected] composite coating was 106.05 Ω∙cm2, which was increased by 2.97 orders of magnitude than pure WPA coating. The above results demonstrated the application potential of [email protected] nanoparticles in metal anticorrosion.