CORROSION INHIBITOR OF MILD STEEL IN 1M SULFURIC ACID (H2SO4) SOLUTION USING MORINGA LEAF AND SEED EXTRACTS.

Summary

The inhibitive effect of Moringa leaf (LE) and Moringa seed (SE) on mild steel corrosion in 1M H2SO4 solution was
investigated using standard weight loss at 32oC and 60oC.The analysis of the experimental results revealed that the leaves
and seeds extract establish their inhibitive action through adsorption of phytochemical component molecules on the metal
surface. The FTIR analysis of leaf and seed extracts and corrosion product shows the variation of the peak numbers and
the nature of the shifts indicate that there is synergy among the functional groups of the Moringa leaf and Moringa seed
extracts in the corrosion inhibition process. Potentiodynamics polarization shows that the extracts inhibited both cathodic
and anodic reactions and acted as mixed-type inhibitor. Moreover, the inhibitive action of the plants extract demonstrates
that the adsorption of plants extract is spontaneous and the physical adsorptions are found in accord with Langmuir
isotherm. Thermodynamic parameters governing the adsorption process were calculated and discussed.

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