Abstract
Corrosion inhibition of MoO42− 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 MoO42− cannot inhibit corrosion, while MoO42− of 10–30 mM effectively inhibits corrosion, which obeys Langmuir adsorption isotherm. MoO42− acts as an anodic inhibitor. 10 mM MoO42− exhibits an optimum corrosion inhibition efficiency. A uniform oxide layer consisting of Al-Ca-Mo(V)-O(H) complexes forms in moderate concentration of MoO42− (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 MoO42− (30 mM).
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