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ELECTRODEPOSITION MECHANISM OF ALUMINUM-MANGANESE ALLOYS WITH AMORPHOUS AND QUASI-CRYSTAL PHASES

非晶相和准晶相铝锰合金的电沉积机理

基本信息

批准号：
07650874
负责人：
AKIYAMA Tetsuya
金额：
$ 1.34万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650874/
关键词：
Molten Salt Electrolysis Aluminum Alloy Induced Codeposition Amorphous Alloy Alloy Structure

项目摘要

The electrodeposition of Al-Mn alloys from the molten chlorides salts was carried out to investigate the codeposition mechanism.The effect of a current density on the alloy composition and on the cathode current efficiency was investigated. The result shows characteristic feature that the Mn content in the deposits is kept almost constant at relatively lower current densities. At higher current densities, the Mn content in the deposits shifts to reach another constant values which are depended on the bath composition and determined by the limiting aurrent densities of Al and Mn. Then, the polarization curves were measured for Al and Al-Mn deposition. Both depositions of Al and Mn from the alloy plating baths occur at the same potential and no potential region where Mn or Al deposited individually is observed. The partial polarization curves for Al deposition show that the potential of Al deposition shifts to less noble direction by 70mV due to the codeposition with Mn.The morphology and the structure of the Al-Mn alloys were investigated using scanning electron microscope, X-ray diffraction.The alloys became lustrous with an increase in Mn content. X-ray diffraction patterns of these alloys showed that the alloys of lower Mn content consisted of a-Al crystalline phase. With an increase in Mn content, the intensities of the diffraction peaks from the crystalline phase decreased while a broad peak appeared. The electron diffraction pattern of ca.7mass%Mn alloy showed alpha-Al polycrystalline phase. With an increasing Mn content in deposit.the alloy phases changed from alpha-Al to amorphous phase. These phases showed lamellar structure which was parallel to the substrate. In electron diffraction images of Al-Mn alloy of ca.30mass%Mn, four broad rings were observed and they were reflected from microcrystalline intermetallic compound Al_6Mn with the grain size of 3 to 5 nm.

研究了在氯化物熔盐中电沉积Al-Mn合金的共沉积机理，考察了电流密度对合金成分和阴极电流效率的影响。结果表明，在较低的电流密度下，镀层中锰含量基本保持不变。在较高的电流密度下，镀层中Mn含量向另一个恒定值移动，该值取决于镀液组成，并由Al和Mn的极限电流密度决定。然后，测量了Al和Al-Mn沉积的极化曲线。从合金镀浴中的Al和Mn的沉积都发生在相同的电势下，并且没有观察到Mn或Al单独沉积的电势区域。Al沉积的偏极化曲线表明，由于Mn的共沉积，Al沉积的电位向低贵金属方向移动了70 mV.用扫描电镜、X射线衍射等方法对Al-Mn合金的形貌和结构进行了研究，发现随着Mn含量的增加，合金变得光亮，合金中Mn含量越高，合金中Mn的含量越高. X射线衍射分析表明，Mn含量较低的合金由α-Al晶相组成。随着Mn含量的增加，结晶相的衍射峰强度降低，而出现宽峰。7mass%Mn合金的电子衍射图显示为α-Al多晶相。随着存款中Mn含量的增加，合金相由α-Al转变为非晶相。这些相呈平行于基体的层状结构。在约30mass%Mn的Al-Mn合金的电子衍射图像中，观察到四个宽环，它们是由晶粒尺寸为3 ~ 5 nm的微晶金属间化合物Al_6Mn反射出来的。