中文摘要：

利用AlCl3＋LiAlH4＋MgBr2有机溶剂体系在碳钢基体上电沉积出Al—Mg合金镀层，并对不同沉积电流密度下Al—Mg镀层的表面形貌、成分、结构、厚度、结合力和耐蚀性进行了研究。结果表明：沉积出的铝镁合金镀层表面光滑、均匀、致密；膜层中的镁含量随沉积电流密度的增加而增大，且以Al—Mg固溶体形式存在，并按（200）面的结构生长；随沉积电流密度的增加，铝镁合金镀层的厚度与晶格常数呈线性增大;在3．5％NaCl溶液中的耐蚀性呈先增大后减小的规律；Al—Mg镀层与碳钢基体的结合力良好，均大于50N；Al—Mg镀层的沉积速率、结合力和耐蚀性均高于相同沉积条件下的纯铝镀层；Al—Mg合金镀层沉积的最佳电流密度为0．75～1．50A／dm^2。

英文摘要：

Aluminum-magnesium alloy coatings were electroplated onto carbon steel by using All3 ＋ LiAlH4 ＋ MgBr2 organic solvent electrolyte, and the surface morphology, composition, structure, thickness, adhesion and corrosion resistance of aluminum-magnesium alloy coatings were observed and determined. The results show that the deposited aluminum-magnesium alloy coating is smooth, uniform and compact. The component of magnesium exists in the coating with Al-Mg solid solution and forms in the structure of （200） orientation. With increasing current density, the magnesium content, lattice parameter and thickness of coatings rise linearly. Al-Mg alloy coatings have a good adherent to the substrate （larger than 50 N）, and have a high corrosion resistance in 3.5% NaCl solution. The deposition rate, adhesion force and corrosion resistance of aluminum-magnesium alloy coating are greater than that of pure aluminum coating under the same electro-deposited condition. The optimum current density for Al- Mg alloy coatings in organic solvent electrolyte is ranged from 0. 75 to 1.50 A/dm^2.