DefinePK

Abstract

Zinc is a type of metal that will be corrosive if it is in an acidic medium. One way to reduce the rate of zinc corrosion is by adding inhibitor. This research will examine the potential of banana peels as corrosion inhibitors in hydrochloric acid medium. In this study, the type of banana that will be used is Awak banana where is widely available in Indonesia. Banana peels used in this study varied in 3 forms, namely in the powder form, extract form, and tannin form. The ability of these 3 forms of inhibitors will be compared to their ability as zinc inhibitors in HCl medium. The amount of inhibitor added varied from 1 g, 3 g, 5 g, 7 g and 9 g to zinc where was immersed in 50 mL of 3% HCl solution. Corrosion rate and inhibition efficiency were analyzed on day 3, day 6, day 9 and day 12.The results obtained show that the immersion zinc in 3% HCl medium up to 12 days with the addition of powder, extracts, and tannin. Banana peel gives a lower corrosion rate if immersed without inhibitors. The lowest corrosion rate for each form of inhibitor was 10.23 mpy by using the banana peel tannin inhibitor, 16.39 mpy by using the banana peel extract inhibitor, and by using the banana peel powder inhibitor which was 23.95 mpy. All of these rates were achieved with the addition of 9 g inhibitors and duration of immersion time for 12 days. Hence, banana peels in powder form, extract form or tannin form can be used as zinc corrosion inhibitors in hydrochloric acid medium.