锂含量对镁锂合金表面碳酸锂膜层耐蚀性的影响  

Effect of Li Content on Corrosion Resistance of Lithium Carbonate Coating on Mg-Li Alloys

作　　者：周凡 李禹辰 康珍玮 沈俊 任颖 周根树[1] Zhou Fan;Li Yuchen;Kang Zhenwei;Shen Jun;Ren Ying;Zhou Genshu(State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China;Western Metal Material Co.,Ltd,Xi’an 710201,China)

机构地区：[1]西安交通大学金属材料强度国家重点实验室,陕西西安710049 [2]西部金属材料股份有限公司,陕西西安710201

出　　处：《稀有金属材料与工程》2023年第8期2978-2984,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51901176);西安市科技创新计划(201805064ZD15CG48);陕西省重点研发计划(2021GY-253)。

摘　　要：利用低温等离子体在LAZ141镁锂合金表面制备绿色环保且高耐蚀的碳酸锂膜层是一种全新的镁锂合金表面处理技术,为进一步探索合金中Li含量对所形成的碳酸锂膜层结构及耐蚀性能的影响,采用SEM、EDS、EIS和析氢测试等方法对不同Li含量镁锂合金的碳酸锂膜层进行了表征和分析。结果表明:合金基体中Li含量决定了膜层中Li2CO3成分的含量,当合金中Li质量分数达到10%以上时,膜层外层能够形成主要由Li2CO3成分构成的保护层;电化学测试及析氢结果表明,该保护层能够在0.6 mol/L氯化钠溶液中将膜层阻值提高2个数量级以上并将析氢速率降低70%。An eco-friendly and high corrosion-resistant lithium carbonate coating was fabricated on LAZ141 alloy by low temperature plasma.To investigate the effect of Li content of alloy on the structure,composition and anticorrosive properties of the as-prepared coating,SEM,EDS,EIS and hydrogen evolution tests were adopted for characterization and analysis.The results show that the content of lithium carbonate in coatings is determined by Li content in alloys.A protective layer with high ratio of Li2CO3 can be formed in the coating when the Li content in alloy is beyond 10wt%.Hydrogen evolution and EIS results in 0.6 mol/L NaCl solution indicate that the protective layer can improve the resistance of coating by over two orders of magnitude and reduce the hydrogen evolution rate of substrate by about 70%.

关 键 词：镁锂合金 低温等离子体 耐蚀性 碳酸锂膜层 

分 类 号：TG174.44[金属学及工艺—金属表面处理]