N,N-Dipropynoxy methyl amine trimethyl phosphonate as corrosion inhibitor for iron in sulfuric acid |
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Authors: | Tianbao Du Jiajian Chen Dianzhen Cao |
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Affiliation: | (1) Department of Materials Science & Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;(2) Institute of Corrosion and Protection of Metals, Chinese Academy of Sciences, Shenyang, 110015 |
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Abstract: | The corrosion inhibition of iron in 0.5 M sulfuric acid by N, N-dipropynoxy methyl amine trimethyl phosphonate has been investigated by means of the potentiodynamic polarization and electrochemical impedance spectrum (E.I.S) techniques. N,N-dipropynoxy methyl amine trimethyl phosphonate was studied in concentrations from 40 ppm to 320 ppm at a temperature of 298 K. The results show that the inhibition mechanism of N,N-dipropynoxy methyl amine trimethyl phosphonate is mixed controlled. It is also found that this inhibitor obeys the Frumkin adsorption isotherm and Flory-Huggins isotherm based on a substitutional adsorption process. |
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