Effect of Zn addition on the corrosion behaviours of as-cast BCC Mg-11Li based alloys in NaCl solution
Effect of Zn addition on the corrosion behaviours of as-cast BCC Mg-11Li based alloys in NaCl solution
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添加Zn对铸态BCC Mg-11Li基合金在NaCl溶液中腐蚀行为的影响
DOI：
10.1016/j.matdes.2022.111019
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发表时间：
2022-08-05
影响因子：
8.4
通讯作者：
Zhang, Zhengrong
中科院分区：
文献类型：
--
作者：
Li, Chuanqiang;Deng, Binbin;Zhang, Zhengrong
研究了 Zn 对 Mg-11Li-xZn（x = 0、1、3、6；称为 L11、LZ111、LZ113、LZ116）合金在 0.1 M NaCl 溶液中腐蚀行为的影响。结果表明，四种合金的耐腐蚀性按照 LZ116 < LZ113 近似于 L11 < LZ111 的顺序增加。此外，四种合金在腐蚀早期均出现丝状腐蚀，而随着浸泡时间的延长，L11、LZ113和LZ116合金优先出现额外的点蚀。少量合金化Zn可降低Mg-11Li合金的腐蚀速率，过量Zn因第二相与基体之间存在微电偶效应而加速腐蚀。从表面薄膜来看，在L11和LZ111的顶部可以观察到相当厚的外层和内层的双层。然而，少量的合金化Zn容易对表面膜进行改性，从而使LZ111合金具有较高的耐蚀性，而高浓度的Zn会导致LZ113和LZ116合金表面膜的快速腐蚀破坏，并进一步提高腐蚀速率。 (C) 2022 作者。由爱思唯尔有限公司出版
Effect of Zn on the corrosion behaviours of Mg-11Li-xZn (x = 0, 1, 3, 6; termed as L11, LZ111, LZ113, LZ116) alloys in 0.1 M NaCl solution has been investigated. The results reveal that corrosion resistance of four alloys increases following the order LZ116 < LZ113 approximate to L11 < LZ111. Besides, filiform-like corrosion occurs at early corrosion stage for the four alloys, while additional pitting corrosion preferentially emerges in the L11, LZ113 and LZ116 alloys with immersion time. The small alloying Zn can reduce corrosion rate of Mg-11Li alloys, and excess Zn will accelerate the corrosion due to the existence of microgalvanic effect between second phase and matrix. Regarding of the surface film, double layers of considerable thick outer layer and inner layer can be observed on the top of L11 and LZ111. Nevertheless, small alloying Zn is prone to modify the surface film and contributes to the high corrosion resistance of LZ111 alloy, while high Zn concentration results in the rapid corrosion damage of surface films on the LZ113 and LZ116 alloys and further elevate corrosion rate. (C) 2022 The Authors. Published by Elsevier Ltd.