Corrosion inhibition and adsorption behavior of methionine on copper in HCl and synergistic effect of zinc ions
2008; Elsevier BV; Volume: 114; Issue: 2-3 Linguagem: Inglês
10.1016/j.matchemphys.2008.10.007
ISSN1879-3312
AutoresDaquan Zhang, Qi-Rui Cai, Xian-Ming He, Lixin Gao, Gui Soon Kim,
Tópico(s)Hydrogen embrittlement and corrosion behaviors in metals
ResumoThe efficiency of methionine (MTI) as a non-toxic corrosion inhibitor for copper in 0.5 M HCl has been studied by using cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. Methionine has shown limited inhibiting properties for copper corrosion in 0.5 M HCl. The presence of Zn2+ ions increases the inhibition efficiency to 92%. Results obtained from potentiodynamic polarization and impedance measurements are in good agreement. The adsorption of methionine on copper surface follows Langmuir isotherm. The adsorption free energy of methionine on copper (∼−26 kJ mol−1) reveals a strong physical adsorption of the inhibition on the copper surface.
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