Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第16卷    第4期    总第85期    2006年4月

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文章编号: 1004-0609(2006)04-0575-05
Al-Mg合金镀层的制备与性能
王吉会, 张爱平, 刘 翔, 田维静

(天津大学 材料科学与工程学院, 天津 300072)

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50 N; 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0.75~1.50 A/dm2。

 

关键词:  Al-Mg合金; 电镀; 有机溶剂体系; 组织结构; 耐蚀性

Preparation and properties of Al-Mg electrodeposited coating
WANG Ji-hui,  ZHANG Ai-ping,  LIU Xiang,  TIAN Wei-jing

School of Materials Science and Engineering,
Tianjin University, Tianjin 300072, China

Abstract: Aluminum-magnesium alloy coatings were electroplated onto carbon steel by using AlCl3+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/dm2.

 

Key words: Al-Mg alloy; electroplating; organic solvent electrolyte; microstructure; corrosion resistance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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