Details

Autor(en) / Beteiligte

• El Hamdani, Naoual
• Fdil, Rabiaa
• Tourabi, Mustapha
• Jama, Charafeddine
• Bentiss, Fouad

Titel

Alkaloids extract of Retama monosperma (L.) Boiss. seeds used as novel eco-friendly inhibitor for carbon steel corrosion in 1M HCl solution: Electrochemical and surface studies

Ist Teil von

• Applied surface science, 2015-12, Vol.357, p.1294-1305

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •AERS is good eco-friendly corrosion inhibitor for carbon steel in 1M HCl.•AERS acts as mixed-type inhibitor in 1M HCl medium.•AERS adsorption is well described by Langmuir isotherm.•Surface analyses were used to explain the AERS mechanism of carbon steel corrosion inhibition. Current research efforts now focus on the development of non-toxic, inexpensive and environmentally friendly corrosion inhibitors as alternatives to different organic and non-organic compounds. In this field, alkaloids extract of Retama monosperma (L.) Boiss. seeds (AERS) was tested for the first time as corrosion inhibitor for carbon steel in 1M HCl medium using electrochemical and surface characterization techniques. The obtained results showed that this plant extract's acts as an efficient corrosion inhibitor for carbon steel in 1M HCl and an inhibition efficiency of 94.4% was reached with 400mg/L of AERS at 30°C. Ac impedance experimental data revealed a frequency distribution of the capacitance, simulated as constant phase element. Impedance results demonstrated that the addition of the AERS in the corrosive solution decreases the charge capacitance and simultaneously increases the function of the charge/discharge of the interface, facilitating the formation of an adsorbed layer over the steel surface. Polarization curves indicated that AERS is a mixed inhibitor. Adsorption of such alkaloid extract on the steel surface obeyed to the Langmuir adsorption isotherm. X-ray photoelectron spectroscopy (XPS) showed that the inhibition of steel corrosion in normal hydrochloric solution by AERS is mainly controlled by a physisorption process and the inhibitive layer is composed of an iron oxide/hydroxide mixture where AERS molecules are incorporated.