Pineapple leaf extract as corrosion control for ASTM A36 steel
Syelvia Putri Utami, Viona Aulia Rahmi, Evelyn Evelyn, Desi Heltina, Khairat Khairat, Khairat, Ahmad Fadli, Komalasari, Komalasari
Abstract
Corrosion mostly occurs in industries that use metal in their piping system. Therefore, employing inhibitor helps reduce and control corrosion. Natural inhibitors emerged as one of the interesting alternatives to control corrosion. Extract from pineapple leaves can be used as a green inhibitor. This study aims to apply pineapple leaf extract to constrain the corrosion rate by varying the soaking time of metal, corrosive media (H2SO4 0.1 M, and NaOH 1 M), and inhibitor concentration (0, 1, 1.5, and 2 g/L). Extraction was conducted with ethanol and aquadest by a 1:4 ratio. This study applied the weight loss method as a testing method. It was found that the lowest corrosion rate was 20.686 mpy by H2SO4 0.1 M at a concentration of 2 g/L for 48 h. Meanwhile, the lowest corrosion rate for NaOH 1 M at a concentration of 2 g/L was 0.444 mpy. The highest efficiency was 99.455% for 48 h by 1 M NaOH.