An ionic liquid-assisted strategy for enhanced anticorrosion of low-energy PEO coatings on magnesium–lithium alloy  

作　　者：You Zhang Chuping Chen Haoyue Tian Shuqi Wang Chen Wen Fei Chen 

机构地区：[1]College of New Materials and Chemical Engineering,Hydrogen Energy Research Centre,Beijing Institute of Petrochemical Technology,Beijing 102617,China [2]Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology,Harbin Institute of Technology,Harbin 150001,China [3]Beijing Spacecrafts,China Academy of Space Technology,Beijing 100190,China

出　　处：《Journal of Magnesium and Alloys》2024年第6期2380-2396,共17页镁合金学报（英文）

基　　金：supported by the Natural Science Founda-tion of Beijing(Grant No.2182017,2202017).

摘　　要：A low-energy plasma electrolytic oxidation(LePEO)technique is developed to simultaneously improve energy efficiency and anti-corrosion.Ionic liquids(1-butyl-3-methylimidazole tetrafluoroborate(BmimBF_(4)))as sustainable corrosion inhibitors are chosen to investigate the corrosion inhibition behavior of ionic liquid(ILs)during the LePEO process for LA91 magnesium-lithium(Mg-Li)alloy.Results show that the ionic liquid BmimBF_(4)participates in the LePEO coating formation process,causing an increment in coating thickness and surface roughness.The low conductivity of the ionic liquid is responsible for the voltage and breakdown voltage increases during the LePEO with IL process(LePEO-IL).After adding BmimBF_(4),corrosion current density decreases from 1.159×10^(−4)A·cm^(−2)to 8.143×10^(−6)A·cm^(−2).The impedance modulus increases to 1.048×10^(4)Ω·cm^(−2)and neutral salt spray remains intact for 24 h.The superior corrosion resistance of the LePEO coating assisted by ionic liquid could be mainly attributed to its compact and thick barrier layer and physical absorption of ionic liquid.The ionic liquid-assisted LePEO technique provides a promising approach to reducing energy consumption and improving film performance.

关 键 词：Magnesium-lithium alloy Plasma electrolytic oxidation Low energy Ionic liquid Corrosion resistance 

分 类 号：TG174.4[金属学及工艺—金属表面处理]