Abstract This research aims to determine the ability of Pluchea indica Less methanol extract as an inhibitor in low carbon steel corrosion 1 M hydrochloric acid media. HCl solution was reacted with P. leaves decelerate process oxidation iron (Fe) concentration variations 0 ppm, 500 1000 1500 and 2000 ppm immersion time 2, 4, 6 days. The level determined by loss weight method potentiodynamic pol...