Corrosion Resistance of Magnesium Alloy (AZ31E) asOrthopaedic Biomaterials in Sodium Chloride ContainingAntioxidantly Active Compounds from Eichhornia crassipes

Citation:
S.M.M.Shanab, M. A.Ameer, A. M. Fekry, A. A. Ghoneim, and E. A. Shalaby, "Corrosion Resistance of Magnesium Alloy (AZ31E) asOrthopaedic Biomaterials in Sodium Chloride ContainingAntioxidantly Active Compounds from Eichhornia crassipes", Int. J. Electrochem. Sci., 2011.

Abstract:

Eichhornia crassipes (Water hyacinth) is a hydrophyte which invaded all Egyptian water bodies causing serious problems of navigation and water quality deterioration. Known weight of the sample was successively extracted with hexane (E1), ethyl acetate (E2) and methanol ( E3). Antioxidant activity of extracts was performed by two complementary test system , 2.2'diphenyl-1- picryl hydrazyl (DPPH) and 2,2'- azino-bis (ethylbenzthiazoline-6- sulfonic acid (ABTS) methods which revealed the highest activity of E3 followed in descending order by E2 and E1. Fractionation of the promising methanol extract E3, produced five antioxidantly active fractions (a-e). Identification of the five fractions was performed using chromatographic and spectroscopic methods. Electrochemical impedance spectroscopy (EIS) experiments were carried out in artificial sea water (3.5% NaCl) to study the corrosion inhibition effect of Eichhornia crassipes (Water hyacinth) extracts (E1, E2, E3) and E3 fractions (a-e) on extruded AZ31E

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