材料科学
腐蚀
合金
涂层
复合数
冶金
图层(电子)
陶瓷
层状双氢氧化物
剥脱关节
转化膜
基质(水族馆)
复合材料
氢氧化物
化学工程
石墨烯
纳米技术
工程类
地质学
海洋学
作者
Yong-Xiao Wang,Yaokun Pan,Xiang Xu,Wendong Zhang,Rui Feng,Hui Li,Zengli Gao
标识
DOI:10.1016/j.jmrt.2023.12.067
摘要
In this study, a composite coating comprising a ceramic film and layered double hydroxide (LDHs) layer was prepared on the surface of extruded 2195 Al–Li alloy. The preparation method, surface morphology, and chemical composition of the coating were described and characterized in detail. The corrosion and wear protection of the coating on the Al–Li alloy substrate were tested, and the mechanisms of corrosion and wear resistance were discussed. The results indicate that plasma electrolytic oxidation processing can form a thick ceramic film with good interface bonding on the surface of 2195 Al–Li alloy. Hydrothermal reaction in an alkaline solution produces a nanoscale layer of Mg/Al LDHs on the surface of the ceramic film. The LDHs layer fills the micro-pores and cracks in the film and effectively prevents the corrosion medium from permeating and damaging the alloy matrix. The composite coating reduces the surface corrosion efficiency by 99.98 %. Moreover, the composite-coated samples exhibit long-lasting corrosion resistance in seawater and exfoliation corrosion environments. Additionally, the composite-coated Al–Li alloy exhibits wear resistance 1-2 orders of magnitude higher than that of the bare alloy at both room and high temperatures. This study proposes a novel strategy for corrosion and wear protection of Al–Li alloys.
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