CORROSION INHIBITOR OF MILD STEEL IN 1M SULFURIC ACID (H 2 SO 4 ) SOLUTION USING MORINGA LEAF AND SEED EXTRACTS.
Publication Date : 31/01/2017
The inhibitive effect of Moringa leaf (LE) and Moringa seed (SE) on mild steel corrosion in 1M H 2 SO 4 solution was investigated using standard weight loss at 32 o C and 60 o C.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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