Unjuk Kerja Ekstrak Campuran Cabe dan Tomat Busuk pada Proteksi Logam di Lingkungan Agresif

Abstract

Corrosion can occur when a metal comes into contact or interacts with its surrounding environment. For instance, a steel plate left exposed to open air will eventually undergo corrosion. SS400 (Structural Steel) is a type of low-carbon steel (mild steel) that conforms to ASTM A36 or JIS G3101 standards. Various methods are available to mitigate the corrosion process, one of which is the application of corrosion inhibitors. Organic inhibitors represent a class of corrosion inhibitors that are non-toxic, cost-effective, naturally abundant, renewable, and environmentally benign. Corrosion inhibitors can be derived from both organic and inorganic compounds. In this study, extracts from chili and spoiled tomatoes were utilized as corrosion-retarding agents. These inhibitors were applied to SS400 carbon steel immersed in 1 M HCl and 1 M H₂SO₄ solutions. The performance of the mixed extract inhibitor from chili and spoiled tomatoes against the corrosion rate of SS400 mild steel in 1 M HCl solution exhibited an inhibition efficiency of 93%. This inhibitor was sufficiently effective in suppressing the corrosion rate in HCl solution. The performance of the mixed extract inhibitor from chili and spoiled tomatoes against the corrosion rate of SS400 mild steel in 1 M H₂SO₄ solution exhibited an inhibition efficiency of 57%. This inhibitor was not sufficiently effective in mitigating the corrosion rate in H₂SO₄ solution..