Abstract
Currently, corrosion inhibitors derived from organic materials are preferred in the industry because organic inhibitors are environmentally friendly and cheaper than inorganic inhibitors. This study was aimed at determining the corrosion inhibition ability of soursop leaf extract (Annona muricata L.) towards zinc. Soursop leaves extraction was carried out by maceration method using ethanol as solvent. In this study, the variations in the ratio of the soursop leaves powder weight to solvent volume were 1:4 g/ml, 1:6 g/ml, 1:8 g/ml, and 1:10 g/ml, and the immersion duration was two days. The extract obtained was studied as a zinc corrosion inhibitor using a 3% sodium chloride solution as the immersion medium. The inhibitor concentration was 2%, with the immersion duration varying from 2 days to 8 days. The results obtained showed that at the ratio of the soursop leaves powder weight to solvent volume of 1:10, the lowest corrosion rate (2.28 mpy) and inhibition efficiency (61.20%) were observed after eight days of immersion.
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