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Inhibitive effect of sodium molybdate on corrosion behaviour of AA6061 aluminium alloy in simulated concrete pore solutions
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Highlights Inhibitive effect of MoO4 2− on AA6061 aluminium alloy is related to its concentration. Low concentration of MoO4 2− does not play a role in corrosion inhibition. 10 mM MoO4 2− exhibits an optimum corrosion inhibition efficiency. Inhomogeneous Al-Mg-Si-O(H) and Al-Ca-Mo(VI)-O(H) forms in 30 mM MoO4 2−.
Abstract Corrosion inhibition of MoO4 2− for AA6061 aluminium alloy in simulated concrete pore solutions was investigated. Electrochemical methods were adopted to assess corrosion behaviour of AA6061 and surface characterizations were employed to obtain composition and morphology of oxide layers. Results show that low concentration (6 mM) of MoO4 2− cannot inhibit corrosion, while MoO4 2− of 10–30 mM effectively inhibits corrosion, which obeys Langmuir adsorption isotherm. MoO4 2− acts as an anodic inhibitor. 10 mM MoO4 2− exhibits an optimum corrosion inhibition efficiency. A uniform oxide layer consisting of Al-Ca-Mo(V)-O(H) complexes forms in moderate concentration of MoO4 2− (10 mM). Inhomogeneous oxide layer consisting of Al-Mg-Si-O(H) and Al-Ca-Mo(VI)-O(H) complexes forms in high concentration of MoO4 2− (30 mM).
Inhibitive effect of sodium molybdate on corrosion behaviour of AA6061 aluminium alloy in simulated concrete pore solutions
Graphical abstract Display Omitted
Highlights Inhibitive effect of MoO4 2− on AA6061 aluminium alloy is related to its concentration. Low concentration of MoO4 2− does not play a role in corrosion inhibition. 10 mM MoO4 2− exhibits an optimum corrosion inhibition efficiency. Inhomogeneous Al-Mg-Si-O(H) and Al-Ca-Mo(VI)-O(H) forms in 30 mM MoO4 2−.
Abstract Corrosion inhibition of MoO4 2− for AA6061 aluminium alloy in simulated concrete pore solutions was investigated. Electrochemical methods were adopted to assess corrosion behaviour of AA6061 and surface characterizations were employed to obtain composition and morphology of oxide layers. Results show that low concentration (6 mM) of MoO4 2− cannot inhibit corrosion, while MoO4 2− of 10–30 mM effectively inhibits corrosion, which obeys Langmuir adsorption isotherm. MoO4 2− acts as an anodic inhibitor. 10 mM MoO4 2− exhibits an optimum corrosion inhibition efficiency. A uniform oxide layer consisting of Al-Ca-Mo(V)-O(H) complexes forms in moderate concentration of MoO4 2− (10 mM). Inhomogeneous oxide layer consisting of Al-Mg-Si-O(H) and Al-Ca-Mo(VI)-O(H) complexes forms in high concentration of MoO4 2− (30 mM).
Inhibitive effect of sodium molybdate on corrosion behaviour of AA6061 aluminium alloy in simulated concrete pore solutions
Wang, Danqian (author) / Wu, Miao (author) / Ming, Jing (author) / Shi, Jinjie (author)
2020-10-21
Article (Journal)
Electronic Resource
English
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