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 extrac t as corros ion inhibitor on mild steel in H 2 SO 4 solution was carried out. Gas chromatography - M ass spectrometer analysis was c onducted to identify active components present in the extract. Corrosion inhibition of the plant extract on mild steel in 1M H 2 SO 4 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 i nhibitor efficiency of 98 %. The adsorption of hyptis suaveolen L poit leaves extrac t on the metal surface obeys Langmuir adsorption isotherms. P otentiodynamic polarization data indicated th at hyptis suaveolen L poit leaves extrac t is a mixed - type corrosion inhibitor , they retarded both cathodic and anodic reaction s . All the studied parameters gave good anti - corrosive properties against corrosion of mild steel in the tested solutions .