Preparation, characterization, and evaluation of corrosion inhibition efficiency of sodium lauryl sulfate modified chitosan for mild steel in the acid pickling process

• Published in: Journal of molecular liquids Vol. 320; p. 114382
• Main Authors: Jessima, S.J. Hepziba Magie, Berisha, Avni, Srikandan, Subramanian Sathy, S., Subhashini
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.12.2020
• Subjects: Contact angle measurement; Corrosion inhibitor; Density functional theory; Monte Carlo simulation; SLS surfactant; Zeta potential; Density functional theory; SLS surfactant; Zeta potential; Corrosion inhibitor; Contact angle measurement; Monte Carlo simulation
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2020.114382

The polar head and a hydrophobic long alkyl chain end of surfactants show effective adsorption on the metal surfaces and metal/solution interfaces. The present study deals with the investigation of corrosion inhibition efficiency of chitosan modified with an anionic surfactant, namely sodium lauryl sulfate. The modified chitosan was characterized using spectral techniques such as ATR- FTIR and NMR, thermal analytical methods that include TGA and DSC. The surface charge and particle size distribution were analyzed using Zeta potential analyzer. The corrosion inhibition efficiency of the water-soluble modified chitosan was evaluated using gravimetric and electrochemical methods. A maximum corrosion inhibition efficiency of 96.44% for 6 h of immersion period at 303 K was obtained. The adsorption process obeyed Langmuir isotherm. The adsorption mechanism involved both physisorption and chemisorption. Tafel and impedance studies showed results in agreement with the gravimetric method. Tafel plot indicates the inhibitor controlled both cathodic hydrogen evolution and anodic metal dissolution reactions. AC impedance study supports the increase in surface coverage of the metal surface by the inhibitor, forming a protective film. Further evidence comes from the surface characterization of the inhibited metal surface by contact angle measurement, SEM, EDAX spectra, and atomic force microscopic studies. DFT and Monte Carlo simulation studies showed a proper alignment with the experiment results. [Display omitted] •SLC characterization in terms of functional groups, temperature response, surface charge, and particle size distribution•IE (%) evaluated using gravimetric and electrochemical methods.•Surface characterization using Contact angle, AFM, SEM, EDAX studies•DFT and Monte Carlo simulation studies to validate experimental results