The Potential of UNCARIA GAMBIR as Mild Steel Corrosion Inhibitor

ISBN-13: 9783845420448 / Angielski / Miękka / 128 str.

Mohd. Hazwan Hussin; Mohd. Jain Noordin Mohd. Kassim

Opis

Uncaria gambir, a native Southeast Asia herbal plant has been characterized and studied as a mild steel corrosion inhibitor in acidic media. It was revealed that ethyl acetate gambir extract gave the highest condensed tannin, phenol and flavonoid content compared with other solvent extracts. Quantification studies by means of HPLC have shown that more than 80 % (wt) of gambir extract consists mainly of catechin. The effect of both ethyl acetate gambir extract and (+)-catechin hydrate as corrosion inhibitors for mild steel in 1 M HCl solution was done using various techniques such as weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. It was revealed that inhibition was concentration dependent as inhibition efficiency (IE) increases with the increase in the inhibitor concentration. Potentiodynamic polarization measurement indicated that the inhibitors act as mixed-type inhibitors with predominant anodic inhibition. EIS measurement indicated that the corrosion of mild steel in the absence and presence of inhibitor was mainly controlled by charge transfer process.

O autorze

Mohd. Hazwan Hussin received his B.Sc (Hons.) in Chemistry and M.Sc in Corrosion Chemistry and Coatings from Universiti Sains Malaysia in 2008 and 2011 respectively. Currently, Mohd Hazwan is a doctoral candidate in the same university.