Inhibitive effect of sodium molybdate on corrosion behaviour of AA6061 aluminium alloy in simulated concrete pore solutions
Inhibitive effect of sodium molybdate on corrosion behaviour of AA6061 aluminium alloy in simulated concrete pore solutions
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DOI：
10.1016/j.conbuildmat.2020.121463
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发表时间：
2020-11
影响因子：
7.4
通讯作者：
Danqian Wang;Miao Wu;Jing Ming;Jinjie Shi
中科院分区：
文献类型：
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作者：
Danqian Wang;Miao Wu;Jing Ming;Jinjie Shi
研究了MoO 42 −对AA 6061铝合金在模拟混凝土孔隙溶液中的缓蚀作用。采用电化学方法评价了AA 6061的腐蚀行为，并通过表面表征获得了氧化层的组成和形貌。结果表明，低浓度（6 mM）的MoO 42-不能抑制腐蚀，而10-30 mM的MoO 42-有效抑制腐蚀，其符合Langmuir吸附等温线。MoO 42-起阳极抑制剂的作用。10 mM MoO 42 −表现出最佳的缓蚀效率。在中等浓度的MoO 42 −（10 mM）下，形成由Al-Ca-Mo（V）-O（H）复合物组成的均匀氧化层。在高浓度MoO 42 −（30 mM）下，形成由Al-Mg-Si-O（H）和Al-Ca-Mo（VI）-O（H）复合物组成的不均匀氧化层。
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).