Active release of diatomite-MgAl-layered double hydroxide nanostructures on corrosive inhibitors to effectively suppresses corrosion of LA51 alloy

Two-dimensional (2D) materials have been potentially applicable for the corrosive resistance of alloys in corrosive media. Nevertheless, a challenge remains in adapting the 2D nanomaterial layered double hydroxide (LDH) with diatomaceous earth (DE) as two inorganic nanocontainers homogeneously combined and loaded with controlled release corrosion inhibitors . In this research, the high-efficiency anti-corrosion nanofiller for LA51 alloy protection was obtained by integrating MgAl-LDH with Sodium phosphate (SP) utilizing the unique hollow porous structure of DE as a template. As a result, the incorporation of DE-LDH-P provides a 3-order of magnitude enhancement in coating immersion in 3.5 wt% NaCl solution for 40 days compared to pure epoxy. Furthermore, two nanocontainers of DE and LDH with corrosion inhibitor loading up to 15 wt% still demonstrated excellent corrosive protection after 120 h of salt spray. The key to its protective performance is promoting controlled corrosion inhibitor release through a scientific approach that fully utilizes the slow-release properties of DE and LDH. This strategy offers a straightforward and effective approach for formulating anti-corrosion additives tailored for use in corrosive settings, with potential applications across various industrial sectors. Specifically, we advocate for the utilization of maritime instrumentation, underwater armaments, and seawater-based power sources within the domains of ship construction and marine engineering.