تثبيط التآكل لسبيكة الفولاذ الكاربوني في الوسط الحامضي باستخدام مستخلص جذور نبات زهرة النيل

Corrosion inhibition Carbon Steal alloy in acidic media by using Root Extract of Echhornia Crassipes plant

Abstract

Due to the increase of the Water hyacinth plant on water and rivers and its seriousness on the water environment where it consumes 5 liters of water per day as well as affects the purity of water and has significant social and economic effects, these problems led us to choose this plant and benefit from it as an environmentally friendly corrosion inhibitor. This study aimed to prepare some plant extracts as green inhibitors for carbon steel corrosion in the acid medium, Green inhibitors were extracted from the roots of the Water hyacinth plant and using the succulent device where the extraction was successive by using the hexane as a non-polar solvent and methanol as a polar solvent. And the chemical components of these extracts were diagnosed with an analysis of the GC-MS gas chromosomal mass spectrometer. The performance of corrosion inhibition of polar and non-polar extract on carbon steel corrosion in the middle of hydrochloric acid (1M) was studied using the polarization technique (TAFL). Where the results of the static stress study showed that the inhibition efficiency of Water hyacinth root extract increased as the concentration of the inhibitor increased and the highest value of inhibition efficiency (96%) was obtained when concentrated (500ppm) for polar extract while it was (91%) when concentrated (500ppm) for non- polar extract, these result were used in calculating the isotherms of the adsorption process based on Lankmayer’s theory by forming an adsorbed monolayer on the surface of the alloy. Where the value of the free piston energy was equal to (-35 KJ Mol-1 – -40 KJ Mol-1) which means automatic interaction and the type of adsorption is a mixed adsorption, the enthalpy was negative in value, which means the process is heat- emitting, Where the results showed the negative value of randomness, which means that the process of adsorption on the polar surface is accompanied by a decrease in randomness, i.e. the adsorption of inhibitor particles is organized on the surface.