L-Arginine Grafted Chitosan as Corrosion Inhibitor for Mild Steel Protection

Abstract

Corrosion prevention has been a global phenomenon, particularly in metallic and construction engineering. Most inhibitors are expensive and toxic. Therefore, developing nontoxic and cheap corrosion inhibitors has been a way forward. In this work, L-arginine was successfully grafted on chitosan by the thermal technique using a reflux condenser. This copolymer was characterized by Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). The corrosion inhibition performance of the composite polymer was tested on mild steel in 0.5M HCl by electrochemical methods. The potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) results were consistent. The inhibition efficiency at optimum concentration rose to 91.4%. The quantum chemical calculation parameters show good properties of the material as a corrosion inhibitor. The molecular structure of the inhibitor was subjected to density functional theory (DFT) to understand its theoretical properties, and the results confirmed the inhibition efficiency of the grafted polymer for corrosion prevention.

Preparation and corrosion inhibition mechanism of a chitosan ionic liquid Schiff base for the protection of N80 in HCl solution

“…19 In comparison to pure CS, CS-IL and CS-IL-SBs have less intense and much broader peaks, indicating that grafting CS with PTSA and Schiff base groups deformed the crystal zone in the CS system, making it less crystalline. 44 Further, the zeta potentials of the synthesized materials are shown in Fig. S4 (ESI†).…”

Principles and theories of green chemistry for corrosion science and engineering: design and application

“…273 Its multifaceted inhibitive mechanisms contribute to its effectiveness under different corrosive conditions. Also, the corrosion inhibition performance of chitosan has been investigated across a wide range of metal substrates, including carbon steel, [274][275][276][277][278][279][280][281][282][283] aluminum alloys, 284,285 and copper. [286][287][288] Several variables, including pH, temperature, concentration, and exposure period, may affect the effectiveness of chitosan.…”

“…273 Its multifaceted inhibitive mechanisms contribute to its effectiveness under different corrosive conditions. Also, the corrosion inhibition performance of chitosan has been investigated across a wide range of metal substrates, including carbon steel, 274–283 aluminum alloys, 284,285 and copper. 286–288…”

The Use of Plant Extracts as Green Corrosion Inhibitors: A Review

“…The poor solubility of chitosan in water is perhaps considered its only weakness (as an inhibitor), although this problem can be solved by using chitosan derivatives such as carboxymethyl chitosan (while retaining the number of adsorption sites) [92]. Dalhatu et al [95] investigated the effect of L-arginine grafted onto chitosan on the corrosion inhibition of mild steel in 0.5M HCl. The evaluation showed that the inhibition efficiency at optimum concentration rose to 91.4%.…”