Abstract
The present work reports the application of polyethylene glycol (PEG) cross-linked chitosan (Cht-PEG) as a green corrosion inhibitor. This is the first study reporting the application of Cht-PEG as corrosion inhibitor for mild steel in 1 M sulphamic acid solution. The results of gravimetric measurements, electrochemical study and surface analysis (SEM) are presented in this work. The adsorption of the inhibitor over the mild steel surface obeyed the Langmuir isotherm. At an optimum concentration of 200 ppm, the maximum corrosion inhibition efficiency obtained was 93.9%. The electrochemical impedance spectroscopy (EIS) study showed an increase in polarization resistance with increase in the concentration of inhibitor justifying the adsorption and inhibition behaviour. Potentiodynamic polarization indicated that the Cht-PEG behaved as a mixed type inhibitor with cathodic predominance. The density functional theory (DFT) based calculations supported the experimental observations.Graphical
Highlights
Sulphamic acid (H2NSO3H), is used as a cleaning agent in industrial equipment and for the removal of process scales in sugar industry
We have reported the application of thiosemicarbazide and thiocarbohydrazide modified chitosan and Schiff bases of chitosan as corrosion inhibitors for mild steel in 1 M HCl [22, 23]
The electrochemical cell consisted of a three-electrode assembly where a mild steel strip with an exposed area of 1 cm2 was used as working electrode, a graphite rod as counter electrode and a saturated calomel electrode (SCE) as reference electrode
Summary
Sulphamic acid (H2NSO3H), is used as a cleaning agent in industrial equipment and for the removal of process scales in sugar industry. In the continuation of our work on chitosan based corrosion inhibitors, we for the first time, report PEG cross-linked chitosan (Cht-PEG) as a novel eco-friendly corrosion inhibitor for mild steel in 1 M sulphamic acid solution. This modification can improve the solubility and molecular weight of the inhibitor leading to enhanced inhibition behaviour. The weight loss studies were carried out following immersion of the mild steel coupons in 1 M sulphamic acid solution in the absence and the presence of varying concentrations of Cht-PEG using the ASTM procedure [27, 28]. On the basis of this data, the other parameters were evaluated [9, 10, 26]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
