ANTICORROSION ACTIVITY OF LAUNAEA TARAXACIFOLIA LEAVES ON MILD STEEL IN ACID MEDIUM

Abstract

The effectiveness of Launaea taraxacifolia leaf extract (LTLE), ethanol leaf extract as a green anti-corrosive inhibiting agent for mild steel corrosion in 0.5 mol/dm³ HCl was investigated using the gravimetric techniques at temperatures ranging from 303 to 333 K. The results demonstrated LTLE's ability to inhibit corrosion in acidic conditions, with higher inhibition efficiency (95.41%) observed at lower temperatures (303K) and higher extract concentrations (5% v/v). For instance, even at a 5% v/v concentration, inhibition rates reached approximately 95.41 % at 303 K and 85.76 % at 333 K. Thermodynamic parameters, including ΔG_ads, were determined using the Langmuir adsorption isotherm, confirming a monolayer adsorption of the inhibiting agent on the mild steel surface. The ethanol extract of L. taraxacifolia leaves proved to be an effective anti-corrosive inhibiting agent due to its composition rich in essential oils, steroids, triterpenes, and a variety of complex flavonoids, chalcones, and flavones.