在摩尔比为2：1的AlCl3-[bmim]Cl离子液体中，加入一定量的甲苯，控制阴极电流密度，在基体铁片上获得银白色和平整致密的铝镀层。循环伏安实验表明离子液体中沉积铝源于Al2Cl7-的还原，还原峰电位为-0．34V；当电流密度为20mA／cm2时，最大电流效率达97％；所得铝镀层的厚度与电镀时间呈抛物线关系；在电流密度小于35mA／cm2时，镀层厚度随电流密度增大呈逐渐递增趋势；扫描电镜、X射线能谱对铝镀层分析结果表明（45±2）℃温度得到平整致密纯度高的铝镀层；当电流密度为20mA／cm2时，铝镀层呈薄片状生长，随电流密度的增大，镀铝层形貌由片状向粒状过渡，并伴随着晶粒的细化。
Dense, well adherent and silvery bright aluminum coating was obtained on iron substrates from 2AlCl3/[bmim]Cl ionic liquids contained of a small amount of toluene at various cathode current densities. Cyclic voltammogram show that the deposition is obtained owing to the reduction of Al2Cl7-which has a peak value of -0.34 V; The maximal current efficiency of 97% is obtained when current density is 20 mA/cm2. The thickness of aluminum coating increases with prolongation of plating time and the increase of cathode current density when it is less than 35 mA/cm2. The results investigated by SEM and DES show that the aluminum electrodeposits obtained on Fe electrodes were dense, continuous and higher purity at 45±2℃ temperature. When the current density is 20 mA/cm2, the aluminum is deposited in a flaky form, with the increasing of the current density, the form of the aluminum layer changes from flake to graininess, and at the same time, the size of the grains decreases.
参考文献
| [1] | Liao Q.;Stewart G.;Hussey CL.;Stafford GR.;Pitner WR. .ELECTRODEPOSITION OF ALUMINUM FROM THE ALUMINUM CHLORIDE-1-METHYL-3-ETHYLIMIDAZOLIUM CHLORIDE ROOM TEMPERATURE MOLTEN SALT PLUS BENZENE[J].Journal of the Electrochemical Society,1997(3):936-943. |
| [2] | Guikuan Yue;Xingmei Lu;Yanli Zhu .Surface morphology,crystal structure and orientation of aluminium coatings electrodeposited on mild steel in ionic liquid[J].Chemical engineering journal,2009(1):79-86. |
| [3] | Guikuan Yue;Suojiang Zhang;Yanli Zhu .A Promising Method for Electrodeposition of Aluminium on Stainless Steel in Ionic Liquid[J].AIChE Journal,2009(3):783-796. |
| [4] | 高丽霞,王丽娜,齐涛,李玉平,初景龙,曲景奎.离子液体AlCl3/Et3NHCl中电沉积法制备金属铝[J].物理化学学报,2008(06):939-944. |
| [5] | Jiang T;Brym MJC;Dube G;Lasia A;Brisard GM .Electrodeposition of aluminium from ionic liquids: Part I - electrodeposition and surface morphology of aluminium from aluminium chloride (AlCl3)-l-ethyl-3-methylimidazolium chloride ([EMIm]Cl) ionic liquids[J].Surface & Coatings Technology,2006(1/2):1-9. |
| [6] | Tetsuya Tsuda;Toshiyuki Nohira;Yasuhiko Ito .Nucleation and surface morphology of aluminum-lanthanum alloy electrodeposited in a LaCl{sub}3-saturated AlCl{sub}3-EtMeImCl room temperature molten salt[J].Electrochimica Acta,2002(17):2817-2822. |
| [7] | 冯秋元,丁志敏,贾利山,关君实.低温熔融盐电镀铝的研究[J].材料保护,2004(04):1-3. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%