The Potential of UNCARIA GAMBIR as Mild Steel Corrosion Inhibitor Mohd. Hazwan Hussin and Mohd. Jain Noordin Mohd. Kassim

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... Это и многое другое вы найдете в книге The Potential of UNCARIA GAMBIR as Mild Steel Corrosion Inhibitor (Mohd. Hazwan Hussin and Mohd. Jain Noordin Mohd. Kassim)