Sodium molybdate as a corrosion inhibitor for aluminium in H3PO4 solution |
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| Authors: | Xianghong Li Shuduan Deng Hui Fu |
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| Affiliation: | aDepartment of Fundamental Courses, Southwest Forestry University, Kunming 650224, PR China;bKey Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China Ministry of Education, Southwest Forestry University, Kunming 650224, PR China;cFaculty of Wood Science and Decoration Technology, Southwest Forestry University, Kunming 650224, PR China |
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| Abstract: | 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). |
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| Keywords: | A Aluminium B EIS B Polarisation B Weight loss C Acid inhibition |
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