螯合剂辅助法制备镁合金表面Mg-Al LDHs膜及其耐蚀性
Corrosion resistance of Mg-Al LDHs film on magnesium alloy surface by chelating agent-assisted method
查看参考文献42篇
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文摘
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为了降低反应能耗,利用螯合剂辅助法,通过在硝酸铝(Al(NO_3)_3)溶液内分别添加乙二胺四乙酸四钠(EDTA-4Na)、柠檬酸钠(SC)和酒石酸钾钠(PST)三种螯合剂制备转化液,然后将镁合金样品直接浸泡在三种转化液中,于60 ℃,pH值为12.0下反应9 h,即可在镁合金表面制得不同螯合剂掺杂的Mg-Al层状双氢氧化物(layered double hydroxides,LDHs)膜。通过SEM,XRD,FT-IR等分析各LDHs膜的微观形貌、物相组成和耐蚀性。结果表明:螯合剂辅助法可以在常压、60 ℃环境下于镁合金表面成功制得具有典型层状结构的LDHs膜;并且所得的三种Mg-Al LDHs膜均能有效提高镁合金的耐蚀性。然后通过对比研究三种不同LDHs膜层的结构性能发现:添加PST制备得到的Mg-Al-PST LDHs膜致密度最高、厚度最大,可达1.4 μm。三种膜层对镁合金耐蚀性的提高效果依次为:Mg-Al-PST LDHs>Mg-Al-SC LDHs>Mg-Al-EDTA LDHs;其中覆盖Mg-Al-PST LDHs膜的镁合金相比空白镁合金,其腐蚀电流密度下降约两个数量级,腐蚀总电阻上升约一个数量级。基于对所得LDHs膜的结构、性能分析可知螯合剂辅助法可在较低能耗条件下,在镁合金表面原位制备耐蚀性较好的Mg-Al LDHs膜的原因可能是:螯合剂中的羧基可加速Al~(3+)在镁基底的沉积,并促进Al~(3+)对Mg(OH)_2中部分Mg~(2+)的取代而形成LDHs。 |
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其他语种文摘
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In order to reduce the energy consumption of the reaction, the magnesium alloy samples were immersed directly into three conversion solutions and reacted for 9 hours at 60 ℃ and pH=12.0 used the chelating agent-assisted method by adding three chelating agents, ethylenediaminetetraacetic acid tetrasodium (EDTA-4Na), sodium citrate (SC) and potassium sodium tartrate (PST) to aluminum nitrate (Al(NO_3)_3) solution, and Mg-Al layered double hydroxides (LDHs) films doped with different chelating agents can be prepared on the surface of magnesium alloys. The microstructure, phase composition, and corrosion resistance of each LDHs film were analyzed by SEM, XRD, FT-IR, etc. The results show that the chelating agent-assisted method can successfully prepare LDHs films with typical layered structure on the surface of magnesium alloys under normal pressure and 60 ℃ environment; and three kinds of Mg-Al LDHs films obtained can effectively improve the corrosion resistance of magnesium alloys. Then, by comparing the structural properties of three different LDHs film layers, it is found that the Mg-Al-PST LDHs film prepared by adding PST has the highest density and the largest thickness, reaching up to 1.4 μm. The improvement effect of three coatings on the corrosion resistance of magnesium alloys is as follows: Mg-Al-PST LDHs>Mg-Al-SC LDHs>Mg-Al-EDTA LDHs; The magnesium alloy covered with the Mg-Al-PST LDHs film compared to the blank magnesium alloy, the corrosion current density decreases by about two orders of magnitude, and the total corrosion resistance increases by about one order of magnitude. And based on the analysis of the structure and properties of the obtained LDHs films, it can be seen that the chelating agent-assisted method can prepare Mg-Al LDHs films with better corrosion resistance in-situ on the surface of magnesium alloys under the lower energy consumption condition. The reason may be that the carboxyl group in the chelating agent can accelerate the deposition of Al~(3+) on the magnesium substrate and promote the substitution of some Mg~(2+) in Mg (OH)_2 by Al~(3+) to form LDHs. |
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来源
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材料工程
,2024,52(3):166-175 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000514
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关键词
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镁合金
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LDHs膜
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原位制备
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螯合剂
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耐蚀性
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地址
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1.
佛山科学技术学院材料科学与氢能学院, 广东, 佛山, 528000
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南昌航空大学材料科学与工程学院, 南昌, 330063
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武汉理工大学材料科学与工程学院, 武汉, 430070
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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广东省重点研发计划项目
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广东省基础与应用基础研究基金项目
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佛山市核心技术攻关项目
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文献收藏号
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CSCD:7686370
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