The corrosion inhibition characteristics of the extract obtained from the seeds of Syzygium javanicum (syn. Eugenia javanica) on mild steel corrosion in hydrochloric acid were investigated by weight loss, electrochemical, IR spectral and SEM studies. The inhibition efficiency increased with increase in inhibitor concentration, but decreased with increase in temperature. Thermodynamic parameters and adsorption behavior were evaluated to reveal the spontaneity of the adsorption process. The polarization measurements indicated that the inhibitor is a mixed type. The confirmation of the passive layer formation was done by Fourier transform infrared (FTIR) spectra and scanning electron microscopy (SEM).

Key words: S. javanicum, steel, corrosion, polarization, impedance, eco-friendly