Effect of process conditions on crystal structure of Al PEO coating. I. Unipolar pulse and coating time

Abstract

Crystallographic phases of Plasma electrolytic oxidized Al alloy, A1050, were investigated. The electrolyte of PEO was Na 2 Si 2 O 3 and KOH. Unipolar pulse, 2000 µsec with 400 µsec + 420 V impulse, were applied for 2 min, 5 min, 15 min, and 30 min. γ-Alumina, as well as α-alumina, was main crystal phase. γ-Alumina was appeared in the beginning, then the amount of α-alumina was increased with time, but the amount of γ-alumina remained constant without any increasing. So, it is concluded that plasma gas produce γ-alumina at the first, and then γ-alumina transform α-alumina finally. During the transformation, high temperature of micro plasma gives transformation energy.

A Study on the Leaching and Recovery of Lithium by Reaction between Ferric Chloride Etching Solution and Waste Lithium Iron Phosphate Cathode Powder

“…동시에 폐리튬이온전지에 포함된 전해질, 중금속 및 유기화합물의 누출은 환경오염 및 인간의 건강에 큰 위협 이 될 것으로 보인다 9,10) . 따라서 위와 같은 문제들을 해결 하기 위해서 폐전지로부터 리튬 자원을 회수하여 재활용 하는 연구와 활발히 진행되고 있다 [11][12][13][14][15] . 일반적으로 폐LFP 전지의 재활용 연구는 크게 직접 재 생법 및 습식 공정법이 있다.…”