Parsley Leaves (Petroselinum Sativum) as Corrosion Inhibitors of Steel DIN 2391 St 37-4 in Acid Medium 5% H2SO4
Ema Obralić *
Department of Physical Chemistry and Electrochemistry, Faculty of Technology, University of Tuzla, Bosnia and Herzegovina.
Amra Odobašić
Department of Physical Chemistry and Electrochemistry, Faculty of Technology, University of Tuzla, Bosnia and Herzegovina.
Sanja Panić
Faculty of Technology, University of Novi Sad, Serbia.
Marijana Tadić
Euroaquaind D.O.O. Tuzla, Bosnia and Herzegovina.
*Author to whom correspondence should be addressed.
Abstract
In this article, the corrosion inhibition of steel DIN 2391 St 37-4 in acidic medium 5% H2SO4 with and without the presence of eco inhibitors of leaf (Petroselinum Sativum) was examined. Inhibitory properties of parsley leaves (Petroselinum Sativum) on steel DIN 2391 St 37-4 were examined by potentiodynamic polarization - Tafel extrapolation, and FTIR method in order to categorize the oxide layer. The test was performed in static medium and with stirring at 600 rpm. By Tafel extrapolation based on changes in corrosion potential, the inhibitor behaves as mixed. Increasing the concentration of inhibitors increases the efficiency of inhibition. Corrosion processes are inhibited by adsorption of organic matter on the surface of steel DIN 2391 St 37-4, forming a film. The obtained results indicate that parsley leaf (Petroselinum Sativum) is an effective eco inhibitor for the tested steel in 5% sulfuric acid.
Keywords: DIN 2391 St 37-4, tafel extrapolation, leaf of Petroselinum sativum, FTIR, 5% H2SO4