Journal
CORROSION SCIENCE
Volume 53, Issue 9, Pages 2748-2753Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2011.05.002
Keywords
Aluminium; EIS; Polarisation; Weight loss; Acid inhibition
Funding
- Applied Fundamental Research Foundation of Yunnan Province [2009CD072]
- Key Construction Course of Chemical Engineering for Forest Products of Southwest Forestry University [XKX200907]
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The inhibition effect of sodium molybdate (Na2MoO4) on the corrosion of aluminium in 1.0 M H3PO4 solution was studied by weight loss, potentiodynamic polarisation curves and electrochemical impedance spectroscopy (EIS) methods. The results show that Na2MoO4 is a good inhibitor, and the inhibition efficiency obtained by three methods is higher than 84% at 20 mM. The adsorption of Na2MoO4 obeys Freundlich isotherm at lower concentrations (1-7 mM), while Langmuir isotherm at higher concentrations (7-20 mM). Polarisation curves indicate that Na2MoO4 acts as an anodic inhibitor. EIS spectra exhibit three loops (two capacitive loops and one inductive loop). (C) 2011 Elsevier Ltd. All rights reserved.
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