STUDY OF HYPTIS SUAVEOLEN L POIT LEAVES EXTRACT AS CORROSION INHIBITOR ON MILD STEEL IN H2SO4 SOLUTION

In this study, hyptis suaveolen L poit (HSLP) leaves extract as corrosion inhibitor on mild steel in H₂SO₄ solution was carried out. Gas chromatography- Mass spectrometer analysis was conducted to identify active components present in the extract. Corrosion inhibition of the plant extract on mild steel in 1M H₂SO₄ was evaluated using weight loss and potentiodynamic polarization methods. The weight loss method results revealed that corrosion rate decreased with increasing inhibitors concentration resulting in inhibitor efficiency of 98 %. The adsorption of hyptis suaveolen L poit leaves extract on the metal surface obeys Langmuir adsorption isotherms. Potentiodynamic polarization data indicated that hyptis suaveolen L poit leaves extract is a mixed-type corrosion inhibitor, they retarded both cathodic and anodic reactions. All the studied parameters gave good anti-corrosive properties against corrosion of mild steel in the tested solutions.