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Experimental and theoretical studies of Alizarin as corrosion inhibitor for mild steel in 1.0 M HCl solution
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نویسنده
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saqalli l. ,galai m. ,benhiba f. ,gharda n. ,habbadi n. ,ghailane r. ,ebn touhami m. ,peres-lucchese y. ,souizi a. ,touir r.
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منبع
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journal of materials and environmental science - 2017 - دوره : 8 - شماره : 7 - صفحه:2455 -2467
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چکیده
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The corrosion inhibition of mild steel in 1.0 m hcl solution by alizarin was investigated using weight loss and electrochemical measurements. the results indicate that the studied compound exhibits good performance as inhibitor for mild steel corrosion in 1.0 m hcl solution and its inhibition efficiency increased with concentration to reach a maximum of 91 % at 10-3 m (optimum concentration). the potentiodynamic polarization curves showed that alizarin acts as a cathodic type inhibitor. it is found also that the inhibition efficiency of this compound decreased with temperature to reach a minimum of 54.3 % at 10-3 m at 328 k. in the other,it is shown that the inhibition efficiency increased with immersion time until 4 h to get 0.89 % and decreased after this time to attain 66.1% at 12 h at the optimum concentration. so,the adsorption of alizarin obeys to the langmuir adsorption isotherm. in addition,the apparent activation energy,enthalpy,entropy and the free energy were determined and discussed. finally,the quantum chemical parameters were determined using density functional theory (dft) method to correlate the calculated structural and electronic parameters of alizarin with its corrosion inhibition efficiency. the obtained results indicated a good agreement between experimental and theoretical studies. © 2017,university of mohammed premier,oujda morocco.
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کلیدواژه
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Alizarin; Corrosion inhibitor; DFT; Electrochemical measurements; Mild steel; Weight loss
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آدرس
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laboratory of organic synthesis,organometallic and theory,faculty of science,ibn tofail university,po box 133,kenitra, Morocco, laboratory of materials engineering and environment: modeling and application,faculty of science,ibn tofail university,po box 133,kenitra, Morocco, laboratory of separation methods,faculty of science,ibn tofail university,po box 133,kenitra, Morocco, laboratory of organic synthesis,organometallic and theory,faculty of science,ibn tofail university,po box 133,kenitra, Morocco, laboratory of organic synthesis,organometallic and theory,faculty of science,ibn tofail university,po box 133,kenitra, Morocco, laboratory of organic synthesis,organometallic and theory,faculty of science,ibn tofail university,po box 133,kenitra, Morocco, laboratory of materials engineering and environment: modeling and application,faculty of science,ibn tofail university,po box 133,kenitra, Morocco, chemical engineering laboratory umr/ups,toulouse university,po box 84234,4 emile monso went,toulouse cedex 4, France, laboratory of organic synthesis,organometallic and theory,faculty of science,ibn tofail university,po box 133,kenitra, Morocco, laboratory of materials engineering and environment: modeling and application,faculty of science,ibn tofail university,po box 133,kenitra,morocco,regional center of education and training (crmef),avenue allal al-fassi,madinat al irfane po box 6210,rabat, Morocco
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Authors
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