工艺参数对电沉积制备铝镁合金的影响

发布时间：2018-05-28 16:03

本文选题：工艺参数 + 铝镁合金　；参考：《表面技术》2017年05期

【摘要】：目的以AlCl_3和LiAlH_4为溶质,苯和四氢呋喃为溶剂,进行电沉积铝镁合金,探索制备铝镁合金的最佳工艺条件。方法在AlCl_3-LiAlH_4-苯-四氢呋喃体系中,采用镁作阳极,通过预电沉积获得一定浓度的Mg~(2+),从而进行电沉积制备铝镁合金镀层。改变电流密度、沉积时间、预电沉积时间和预电沉积次数等参数,以探究工艺参数对铝镁镀层的形貌、晶粒大小和镁含量的影响,并通过SEM和EDS检测和分析铝镁合金的镀层形貌、成分及含量。结果镀层主要成分为Al_3Mg_2和Al_(12)Mg_(17),当电流密度为16.67 m A/cm~2时,获得的镀层表面效果最好,其晶粒尺寸可达1~2mm。预电沉积次数越多,通过预电沉积获得的Mg~(2+)越多,铝镁合金镀层中镁的含量越高,最高可达2.93%(质量分数)。结论在一定范围内,镀层中的镁含量随预电沉积时间的增加而提高。预电沉积次数越多,通过预电沉积溶解的Mg~(2+)越多,铝镁合金镀层中的镁含量越高。当沉积时间过长时,不利于镀层中镁含量的提高。铝镁镀层中的镁含量越高,电化学阻抗越大,腐蚀电位越大,镀层的耐腐蚀性能越好。
[Abstract]:Aim to study the optimum preparation conditions of aluminum magnesium alloy by electrodeposition with AlCl_3 and LiAlH_4 as solute and benzene and tetrahydrofuran as solvent. Methods in the AlCl3-LiAlH4- benzene-tetrahydrofuran system, magnesium was used as anode, and a certain concentration of Mg~(2 was obtained by pre-electrodeposition. By changing the parameters of current density, deposition time, pre-electrodeposition time and times of pre-electrodeposition, the effects of process parameters on the morphology, grain size and magnesium content of Al-Mg coating were investigated. The morphology, composition and content of aluminum-magnesium alloy coating were detected and analyzed by SEM and EDS. Results the main composition of the coating is Al_3Mg_2 and Alsp / 12mg / s. When the current density is 16.67mA / cm ~ 2, the surface effect of the coating is the best, and the grain size of the coating is up to 1 mm2. The more times of pre-electrodeposition, the more Mg~(2 obtained by pre-electrodeposition, the higher the content of magnesium in the coating of Al-Mg alloy, the highest is 2.93% (mass fraction). Conclusion in a certain range, the magnesium content in the coating increases with the increase of pre-electrodeposition time. The more times of pre-electrodeposition, the more Mg~(2 dissolved by pre-electrodeposition, the higher the content of magnesium in Al-Mg alloy coating. When the deposition time is too long, it is not conducive to the increase of magnesium content in the coating. The higher the content of magnesium in aluminum-magnesium coating, the greater the electrochemical impedance and corrosion potential, the better the corrosion resistance of the coating.
【作者单位】：沈阳大学辽宁省先进材料制备技术重点实验室;
【基金】：辽宁省高等学校优秀人才支持计划项目资助(LJQ2015074) 国家自然科学基金资助(51101104,51372156)~~
【分类号】：TG174.44

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