Layer-by-layer surfactants on silica nanoparticles for active corrosion protection

Abstract

Developing active corrosion protection coatings for metals and alloys is one of the important issues for several industries. The present study aimed to assess the corrosion protection efficiency of 2024 aluminium alloy (AA2024) by employing surfactant modified silica nanocontainers capable of releasing entrapped corrosion inhibitors in a controllable manner. Inhibitor loaded silica nanocontainers were synthesised by layer-by-layer (LbL) deposition of surfactants and corrosion inhibitor on silica nanoparticles. The LbL deposition process was confirmed by light scattering (Zetasizer) and UV-vis spectroscopy results. The kinetic assessments of the inhibitor release from nanocontainers showed increasing acidity and temperature increases concentration of inhibitors. The anti-corrosion assessments including low corrosion current density and other electrochemical parameters of paint coating doped with 5 wt-% nanocontainers on the AA2024 revealed beneficial effect of inhibitor loaded nanocontainers on passive and active corrosion protection.