Details

Autor(en) / Beteiligte

• Abdallah, Y. M.
• Shalabi, K.

Titel

Comprehensive study of the behavior of copper inhibition in 1 M HNO3 by Euphorbia Helioscopia linn. extract as green inhibitor

Ist Teil von

• Protection of metals and physical chemistry of surfaces, 2015-03, Vol.51 (2), p.275-284

Ort / Verlag

Moscow: Pleiades Publishing

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The inhibitive effect of the Euphorbia Helioscopia linn. extract (EHE) on the corrosion of copper in 1 M HNO 3 has been evaluated by means of potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The calculated adsorption thermodynamic parameters indicated that the adsorption was a spontaneous, exothermic process accompanied by an increase in entropy. The inhibition efficiency increases with increasing the concentration of the inhibitor in the medium and decrease with increasing the temperature. The maximum inhibition approached to 91% in the presence of 500 ppm EHE using Tafel polarization technique. The results show that EHE is an effective corrosion inhibitor for protecting the corrosion of copper in 1 M HNO 3 medium even at stimulated conditions.