Abstract
Considerable efforts have been devoted to develop hybrid inhibitors using layered materials as hosts. These innovative materials are in use to improve corrosion protection properties. Here the synthesis and characterization of a novel inorganic/organic inhibitor by intercalation of 4-aminobutanoic acid (4-ABA) as amino acid motif into layered aluminum tri-polyphosphate (ATP) are presented. The newly developed phosphate material is characterized using a combination of X-ray diffraction, thermal gravimetric analysis, scanning electron microscopy, as well as spectroscopy techniques (IR and Raman). The interlayer spacing of ATP is expanded by 6.74 Å with 4-ABA. Investigations by UV–vis spectra for the as-synthesized hybrid compound ATP-4-ABA display a controlled release behavior for the intercalated amino acid motif. Therefore, electrochemical impedance spectroscopy demonstrated sustained anti-corrosion performance for low carbon steel in 0.1 M NaCl solution. The results of the molecular dynamic simulations and density functional theory calculations support the experimental studies of 4-ABA release and adsorption. The ATP-4-ABA developed in this study proves to be a hybrid corrosion inhibitor system, offering remarkable corrosion protection to carbon steel.
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