Synergetic active corrosion protection of AA2024-T3 by 2D- anionic and 3D-cationic nanocontainers loaded with Ce and mercaptobenzothiazole

Highlights: • LDH-MBT (2D) and NaY-Ce (3D) inhibitor-carrier particles were used. • Inhibition synergy between a 2D and a 3D inhibitor-loaded carrier is demonstrated. • Release kinetics from carriers are studied for a range of pH and NaCl concentrations. • Inhibition in coatings depends on the ratio of 2D:3D particles used. • For the studied system a 90:10 ratio (2D:3D) leads to the best inhibition efficiency. - Abstract: In the current paper the corrosion inhibition synergy between Ce³⁺ loaded NaY-zeolite (NaY-Ce) and 2-Mercaptobenzothiazole (MBT) loaded Zn-Al layered double hydroxide (LDH-MBT) containers is presented. Solutions and water-borne epoxy coatings containing different ratios of the two loaded carriers were prepared and their protection of AA2024-T3 and damaged coatings characterized using global and local electrochemical techniques and other complementary tools. The coatings containing container-combinations showed exceptional corrosion protection over a broad range of NaY-Ce:LDH-MBT weight ratios, with 90:10 being the optimal. The current work landmarks the need for synergetic inhibiting studies devoted to carrier-inhibitor systems in coatings.