Zhang Ding, Mu Yanguang, Li Haipu, Yang Zhaoguang, Yang Ying
College of Chemistry and Chemical Engineering, Central South University Changsha 410083 PR China
Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety Changsha 410083 PR China.
RSC Adv. 2018 Nov 23;8(68):39170-39176. doi: 10.1039/c8ra07788f. eCollection 2018 Nov 16.
Electrodeposition of Al on Mg alloys from ionic liquids has been achieved scientifically. However, it is difficult to realize industrialized production since the preparation of electroplating bath and electrodeposition process must be carried out under inert atmosphere. A simple and practical method was then proposed to guarantee such manipulations in air by introducing a solid water-adsorbent material as well as a liquid protective film in electroplating bath. In the experimental scale, functional Al layers were successfully electrodeposited on AZ91D Mg alloys from a first-generation ionic liquid AlCl/1-butyl-3-methylimidazolium chloride (2 : 1 mol%). The electroplating process was further investigated at constant current and constant potential. A phase of Al of the formed coatings was determined using X-ray diffraction. It was found that a continuous and compact Al film can be obtained on the Mg alloy surface at a constant current along with effective protection, as characterized by scanning electron microscopy, energy disperse spectrometry, potentiodynamic polarization curve and Nyquist plot.
已通过科学方法实现了在镁合金上从离子液体中电沉积铝。然而，由于电镀浴的制备和电沉积过程必须在惰性气氛下进行，因此难以实现工业化生产。于是提出了一种简单实用的方法，通过在电镀浴中引入固体吸水材料和液体保护膜来确保在空气中进行此类操作。在实验规模上，成功地从第一代离子液体AlCl/1-丁基-3-甲基咪唑氯化物（2∶1摩尔%）在AZ91D镁合金上电沉积了功能性铝层。在恒流和恒电位下进一步研究了电镀过程。使用X射线衍射确定了形成涂层的铝相。结果发现，通过扫描电子显微镜、能量色散光谱、动电位极化曲线和奈奎斯特图表征，在恒流下可在镁合金表面获得连续致密的铝膜，并具有有效的保护作用。
