CORROSION PROTECTION OF ST-37 STEEL USING RED DRAGON FRUIT PEEL EXTRACT: EFFECTS OF INHIBITOR CONCENTRATION AND COATING DURATION
DOI:
https://doi.org/10.36526/jc.v8i2.9450Keywords:
red dragon fruit peel, corrosion inhibitor, ST-37 steel, coating time, inhibition efficiencyAbstract
Corrosion of steel in acidic rainwater can compromise material durability, particularly in industrial environments where atmospheric pollutants may contribute to corrosive conditions. This study investigated the effectiveness of red dragon fruit peel (Hylocereus polyrhizus) extract as a green corrosion inhibitor for ST-37 steel exposed to rainwater from the Morowali industrial area. The extract was prepared by maceration using 96% ethanol and applied at concentrations of 6%, 8%, 10%, and 12% with coating durations of 2 and 4 days. Corrosion performance was evaluated using the weight loss method after 504 h of immersion in rainwater with a measured pH of 4.88. A qualitative FeCl₃ test was also conducted to indicate the presence of phenolic compounds in the extract. The results showed that the corrosion rate generally decreased with increasing inhibitor concentration up to 10%, followed by an increase at 12%. The lowest corrosion rate was obtained at a 10% concentration with a 4-day coating, reaching 1.5153 mpy, while the corresponding inhibition efficiency was 68.80%. The 4-day coating consistently provided greater protection than the 2-day coating. These findings demonstrate that red dragon fruit peel extract has potential as a plant-based corrosion inhibitor for ST-37 steel, with 10% inhibitor concentration and 4 days of coating identified as the optimum conditions under the experimental conditions.
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