Gum Arabic-silver nanoparticles composite as a green anticorrosive formulation for steel corrosion in strong acid media
2018
Solomon, Moses M. | Gerengi, Husnu | Umoren, Saviour A. | Essien, Nsikak B. | Essien, Uduak B. | Kaya, Ertugrul
A green anticorrosive composite (GA-AgNPs) has been formulated for steel in 15% HCl and 15% H₂SO₄ media. Characterization of GA-AgNPs is achieved via FTIR, UV-vis, EDAX, and SEM. Gravimetric, electrochemical (EIS, EFM, DEIS, & TP), and surface assessment (SEM, EDAX, AFM, & XPS) techniques have been deployed in the anticorrosion studies. Results from all applied methods potray GA-AgNPs as effective anticorrosive agent. Inhibition is by adsorption mechanism and follows Langmuir isotherm. GA-AgNPs acts as mixed type inhibitor in 15% H₂SO₄ solution but as anodic type in 15% HCl solution. Results from surface techniques confirm adsorption of GA-AgNPs molecules on specimen surface. Oxides, hydroxides, carbonates, and sulphates (H₂SO₄ medium) or chlorides (HCl medium) are the corrosion products in the free corrodent according to XPS results. In the presence of composite, both ionic and neutral forms of GA-AgNPS are adsorbed. AgNPs are present on the surface in the form: Ag°, Ag₂O, and AgO.
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