AZ31镁合金表面一步法合成原位镁铝水滑石转化膜（英文）

发布时间：2018-04-26 18:55

本文选题：镁合金 + 水滑石　；参考：《Transactions of Nonferrous Metals Society of China》2015年06期

【摘要】：通过尿素水解法在AZ31镁合金表面原位合成纳米尺度的层状双金属氢氧化物(水滑石)转化膜,并提出成膜机理。首先,溶解的Mg2+离子沉积形成含有MgC O3和Mg5(CO3)4(OH)2·4H2O的前驱体膜;然后,前驱体膜在碱性条件下转化为高结晶的Mg(OH)2;最后,Mg(OH)2中的Mg2+离子被Al3+离子取代,Mg(OH)2转化为更稳定的水滑石层状结构,同时层间OH-与溶液中的CO2-3发生离子交换,因此形成水滑石(Mg6Al2(OH)16CO3·4H2O)膜。结果表明,以互锁的片状纳米结构和离子交换性能为特征的水滑石膜可以有效提高AZ31镁合金的耐蚀性。
[Abstract]:Layered bimetallic hydroxide (hydrotalcite) conversion films were synthesized on the surface of AZ31 magnesium alloys by urea hydrolysis in situ, and the mechanism of film formation was proposed. First, the dissolved Mg2 ion deposited into the precursor membrane containing MgC O3 and Mg5(CO3)4(OH)2 4H2O; then, the precursor film was transformed into a highly crystallized MgOHH2 in alkaline condition; finally, the Mg2 ion in the MgOHH2 was replaced by the Al3 ion to form a more stable layered structure of hydrotalcite. At the same time, the interlayer OH- exchange with CO2-3 in the solution, thus forming the hydrotalcite Mg6Al2OHHC16CO3 4H2O) membrane. The results show that the corrosion resistance of AZ31 magnesium alloys can be improved effectively by the hydrotalcite film characterized by interlocking flake nanostructures and ion exchange properties.
【作者单位】：山东科技大学材料科学与工程学院;山东科技大学省部共建矿山灾害预防控制国家重点实验室;中国科学院金属研究所;
【基金】：Project(51241001) supported by the National Natural Science Foundation of China Project(ZR2011EMM004) supported by Shandong Provincial Natural Science Foundation,China Project(TS20110828) supported by Taishan Scholarship Project of Shandong Province,China Project(2014TDJH104) supported by SDUST Research Fund,Joint Innovative Center for Safe and Effective Mining Technology and Equipment of Coal Resources of Shandong Province,China
【分类号】：TG174.4

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