Electrodeposition of Al-Mn-Zr ternary alloy films from the Lewis acidic aluminum chloride-1-ethyl-3-methylimidazolium chloride ionic liquid and their corrosion properties
Electrodeposition of Al-Mn-Zr ternary alloy films from the Lewis acidic aluminum chloride-1-ethyl-3-methylimidazolium chloride ionic liquid and their corrosion properties
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DOI：
10.1016/j.surfcoat.2017.04.061
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发表时间：
2017-07-15
影响因子：
5.4
通讯作者：
Cao, Chu-nan
中科院分区：
文献类型：
--
作者：
Yang, Jing;Chang, Ling;Cao, Chu-nan
研究了Lewis酸性氯化铝-1-乙基-3-甲基咪唑鎓·氯化物(AlCl3/[Emim]Cl)离子液体与不同金属盐在低碳钢基体上电沉积Al-Mn和Al-Mn-Zr合金膜的情况。在含有 0.04M MnCl2 的镀液中添加 ZrCl4 会引起更高的电沉积过电势，从而减小电沉积初级微晶的尺寸。通过在含有 0.04 M MnCl2 和 5 mM ZrCl4 的镀液中电沉积获得由许多初级纳米微晶组成的圆形结节颗粒。这些球状颗粒的紧密堆积导致形成致密结构的AlMn-Zr三元合金膜。与裸碳钢电极相比，电沉积Al-Mn和Al-Mn-Zr合金膜电极表现出更大的负腐蚀电位，表明它们对基体具有阴极保护作用。随着合金膜中Zr含量的增大，腐蚀电流密度先减小后增大。在0.04 M MnCl2 和5 mM ZrCl4 浴中制备的Zr 含量为1.871 at.% 的Al-Mn-Zr 三元合金膜表现出最低的腐蚀电流密度。这可归因于其致密的薄膜结构以及与基材良好的结合。 (C) 2017 Elsevier B.V. 保留所有权利。
The electrodeposition of AI-Mn and Al-Mn-Zr alloy films on low carbon steel substrate from the Lewis acidic aluminum chloride-1-ethyl-3-methylimidazolium.chloride (AlCl3/[Emim]Cl) ionic liquids with different metal salts is investigated. The addition of ZrCl4 in the bath with 0.04M MnCl2 induces the higher overpotential for the electrodeposition, which decreases the size of the electrodeposited primary crystallites. Rounded nodular particles composed of many primary nanocrystallites are obtained by the electrodeposition in the bath containing 0.04 M MnCl2 and 5 mM ZrCl4. The close packing of these nodular particles results in the formation of the AlMn-Zr ternary alloy film with a dense structure. Compared with the bare carbon steel electrode, the as-electrodeposited Al-Mn and AI-Mn-Zr alloy film electrodes shows much more negative corrosion potentials, indicating their cathodic protection effect on the substrate. As the Zr content in the alloy films becomes larger, the corrosion current density first decreases, and then increases. The Al-Mn-Zr ternary alloy film with 1.871 at.% Zr, which is prepared in the bath with 0.04 M MnCl2 and 5 mM ZrCl4, manifests the lowest corrosion current density. This can be attributed to its dense film structure and good combination with the substrate. (C) 2017 Elsevier B.V. All rights reserved.