Induced magnetic properties to surface-modified mesoporous porous clay heterostructure for anti-corrosion packaging

Abstract

Porous clay heterostructures (PCHs) provide a large specific area that can be modified by a functional group. In this work, a PCH surface was modified by Fe (Fe2+ and Fe3+) to obtain magnetic PCH. The various Mn ion contents were added into magnetic PCH to enhance the magnetic properties. After that, magnetic PCH was modified by a vapor corrosion inhibitor (VCI). Subsequently, these materials were blended with polylactide to yield polylactide-clay nanocomposites for anticorrosion packaging. The results from the Surface Area Analyzer (SAA) showed that the surface area of the PCH decreased after modification. SEM images and EDX micrographs showed the successful incorporation of the Fe and Mn ion into the PCH.The saturation magnetization (Ms) increased with the higher content of Mn. Magnetic PCFI (0 % Mn) can absorb the most water. The results of the TG/DTA showed that the incorporation of VCI onto the magnetic PCH led to a shift in the DTG peaks to lower temperature, suggesting the increasing volatility brought about by the incorporation on the magnetic PCH. After testing the corrosion, the magnetic PCH-40 % wt VCI has the lowest corrosion rate. The oxygen gas permeability rate was decreased in the PLA nanocomposites due to the enhancing barrier properties of the magnetic PCH.