Cysteine-silver-gold Nanocomposite as potential stable green corrosion inhibitor for mild steel under acidic condition

Megha Basik,Mohd Shoeb,Mohammad Mobin

doi:10.1038/s41598-019-57181-5

Megha Basik, Mohd Shoeb + Show 1 more

Open Access

https://doi.org/10.1038/s41598-019-57181-5

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Journal: Scientific Reports	Publication Date: Jan 14, 2020
Citations: 45	License type: open-access

Affiliation: Aligarh Muslim University

Abstract

Cysteine based silver-gold nanocomposite (Cys/Ag-Au NCz) was synthesized, this was followed by its characterization using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Ultraviolet-visible spectroscopy (UV-Vis), Scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDAX), Thermogravimetric analysis (TGA) and Transmission electron microscopy (TEM). Cys/Ag-Au NCz was studied as novel green corrosion inhibitor for mild steel in 1M HCl solution at varying concentration and temperature using gravimetric, Potentiodynamic polarization (PDP), Electrochemical impedance spectroscopy (EIS), SEM, EDAX and FTIR. Weight loss, PDP and EIS studies confirmed Cys/Ag-Au NCz as efficient corrosion inhibitor at moderately low concentration. The maximum inhibition efficiency of 96 % was observed at 303 K at 300 ppm. Cys/Ag-Au NCz acted by affecting both anodic and cathodic processes and its adsorption on steel surface followed the Langmuir adsorption isotherm. EIS data displayed the existence of protective film at mild steel/solution interface in Cys/Ag-Au NCz inhibited system. SEM micrograph in presence of Cys/Ag-Au NCz inhibited acid solution displayed better morphology as compared to blank solution. The UV-Vis and FTIR data indicates good interaction between the Cys/Ag-Au NCz and steel surface.

Highlights

The appropriate mechanical properties of mild steel makes it an important raw material to find application in various industries like construction, petroleum, power and water generation, etc
To synthesize Ag-Au NCz, 10 mM CTAB, 5.0 mM AgNO3 (3mL) and 5.0 mM HAuCl4 were added to 50.0 mL distilled water9. 20 mL of PFE was introduced into this solution drop wise and exposed inside a conventional microwave oven (Samsung Electronics, 300 W) for complete reduction for 3 min
The peak at 3427 cm−1 is assigned to N–H stretching vibration of the NH3+ group in the cysteine functionalized Ag-Au nanocomposite

Summary

Introduction

The appropriate mechanical properties of mild steel makes it an important raw material to find application in various industries like construction, petroleum, power and water generation, etc. SEM analysis has been conducted for synthesized Cys/Ag-Au NCz to know the surface morphology of the compound (Fig. 4a).

Results

Conclusion