Attenuation of Mild Steel-Acid Corrosion Using Exfoliated Graphite Oxide-Polymer Composite: Synthesis, Characterization, Electrochemical, and Response Surface Method Approach

Abstract

This work deals with the study of the anticorrosion behavior of a biopolymer, namely Guar Gum (GG) and its composite on mild steel (MS) in sulfamic acid (SA) solution using electrochemical techniques. GG was found to be a potential inhibitor relatively at its higher concentration and showed maximum inhibition efficiency (IE) of 74% at 3 g/L (3000 ppm). To improve its IE, exfoliated graphite oxide (xGO)/GG polymer composite was prepared, and its inhibition property was assessed in 1 M SA solution at different temperatures by weight loss method (WL). The chemical structure of xGO/GG polymer composite was examined by FT-IR, and the morphology was inspected by optical microscopy, scanning electron microscopy study, and energy dispersive spectroscopy technique. xGO/GG polymer composite emerged as an efficient corrosion inhibitor for MS as marked from the outcomes of the electrochemical investigations and showed improved IE of 93% at 0.6 g/L (600 ppm) when compared to GG. Experimental results found by WL measurements are used to evaluate the thermodynamic parameters at various temperatures. Further, a Box-Behnken composite design with three factors and three levels has been used to minimize the experimental conditions. The IE was enhanced with the increase in the inhibitor concentration as observed from the main effect plot. The maximum IE of 84.21% was projected by the response surface method (RSM) with temperature (A = 30 °C), inhibitor concentration (B = 600 ppm), and time (C = 1 h).

Unraveling the Adsorption Mechanism and Anti-Corrosion Functionality of Dextrin and Inulin as Eco-Friendly Biopolymers for the Corrosion of Reinforced Steel in 1.0 M HCl: A Thermodynamic and Kinetic Approach

“…The evaluated parameters listed in Table 1 demonstrated that, in comparison with the blank solution, the E corr of RS was, in general, somewhat positively shifted upon the addition of Dex and Inu, indicating the mixed-kind nature of the inhibitors alongside a foremost anodic one [ 46 , 47 ]. Values of both β a and β c in the blank solution were diminished upon adding Dex and Inu, recommending a reduction of the anodic dissolution of RS and hindrance of the cathodic H 2 evolution [ 26 , 27 , 28 ]. Additionally, the value of i corr of RS in the blank solution was decreased upon raising the concentrations of the tested compounds while the values of % IEs were enhanced, as illustrated in Figure 3 .…”

“…Employment of corrosion inhibitors is regarded as one of such significant ways [ 22 , 23 , 24 , 25 , 26 ]. Corrosion inhibitors are organic compounds comprising electron donor atoms and unsaturated bonds, which allow them to be adsorbed on the metal surface and protect such surfaces from the aggressive media [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. Natural organic compounds are essential kind of ecological inhibitors for metallic corrosion to meet environmental requests [ 29 , 30 , 31 , 32 , 33 , 34 ].…”