Improved corrosion resistance of a high-strength Mg-Al-Mn-Ca magnesium alloy made by rapid solidification powder metallurgy
Improved corrosion resistance of a high-strength Mg-Al-Mn-Ca magnesium alloy made by rapid solidification powder metallurgy
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DOI：
10.1016/j.msea.2012.02.046
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发表时间：
2012-05-15
期刊：
影响因子：
6.4
通讯作者：
Mori, Yoichi
中科院分区：
文献类型：
--
作者：
Liao, Jinsun;Hotta, Makoto;Mori, Yoichi
研究了旋水雾化法制备的Mg-Al-Mn-Ca合金的力学性能，特别是腐蚀性能，并与重力铸造和热挤压法制备的合金进行了比较。结果表明，swap合金不仅具有优异的力学性能，而且具有优异的耐蚀性。在0.1 M NaCl溶液中，swap合金的耐蚀性分别比热挤压合金和铸态合金高2.5倍和10倍左右。动电位极化结果表明，在0.1 M NaCl溶液中，三种合金的阳极和阴极电流密度依次为swap合金<热挤压合金<铸态合金。swap合金的阴极和阳极反应的抑制分别是由于α - mg基体中分散的金属间相和过饱和的成分。结果表明，SWAP等金属间相的分散可以大大提高镁合金的耐蚀性。(C) 2012 Elsevier B.V.版权所有
The mechanical property and in particular the corrosion behavior of an Mg-Al-Mn-Ca alloy produced by spinning water atomization process (SWAP) were investigated and compared to those of the alloys made by gravity cast and hot extrusion. It is found that the SWAPed alloy has not only superior mechanical properties but also distinguished corrosion resistance. The corrosion resistance of the SWAPed alloy is about 2.5 and 10 times higher than that of the hot-extruded and as-cast alloys, respectively, when immersed in 0.1 M NaCl solution. Potentiodynamic polarization shows that both the anodic and cathodic current densities of the three alloys in 0.1 M NaCl solution are in the order of SWAPed alloy < hot-extruded alloy < as-cast alloy. The depressed cathodic and anodic reactions of the SWAPed alloy are attributed to the fine dispersed intermetallic phase and the supersaturated composition in alpha-Mg matrix, respectively. The present results demonstrate that the corrosion resistance of magnesium alloys can be greatly improved via the dispersion of intermetallic phase by the process such as SWAP. (C) 2012 Elsevier B.V. All rights reserved.