Synergistic corrosion inhibition and controlled release of ascorbic acid from a layered double hydroxide composite for stainless steel

This study investigates the anticorrosion performance of ascorbic acid (AA) intercalated into a MgAl layered double hydroxide matrix as a sustained-release system for protecting stainless steel. The AA/MgAl layered double hydroxides (LDH) composite was synthesized via the co-precipitation method, and its structural and morphological properties were characterized using X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption/desorption measurements. The intercalation of AA into the LDH structure enabled a controlled and sustained release, enhancing its protective effect in an aggressive acid environment. Electrochemical impedance spectroscopy revealed a significant improvement in corrosion resistance, with the inhibition efficiency converted into an equivalent release rate, reaching up to 70 % after 210 minutes of immersion in 1 M HCl. Kinetic analyses demonstrated that the release of AA followed a non-Fickian diffusion mechanism, ensuring prolonged protection. Additionally, density functional theory and Monte Carlo simulations provided insights into the adsorption mechanisms, highlighting strong interactions between AA and both the LDH matrix and the Fe steel surface. This combined experimental and theoretical approach highlights the potential of AA/MgAl LDH as an efficient, sustainable, and long-lasting corrosion inhibitor, providing a promising solution for industrial applications in harsh acidic environments.

Abstract licence: CC BY

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