Enhancing corrosion resistance of ZK60 magnesium alloys via Ca microalloying: The impact of nanoscale precipitates
Enhancing corrosion resistance of ZK60 magnesium alloys via Ca microalloying: The impact of nanoscale precipitates
复制标题
通过 Ca 微合金化增强 ZK60 镁合金的耐腐蚀性：纳米级析出物的影响
DOI：
10.1016/j.jma.2022.06.011
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发表时间：
2023-09-01
影响因子：
17.6
通讯作者：
Sun, Jun
中科院分区：
文献类型：
--
作者：
Fu, Wei;Yang, Hejie;Sun, Jun
以高强度和低成本提高镁锌合金的耐腐蚀性是扩大其大规模实际应用的关键。在这里，我们制备了固溶、峰时效和过时效的ZK60合金，分别加入和不加入微合金化的Ca(0.26wt.%)，通过实验分析和理论计算详细地探讨了纳米析出物对其腐蚀行为的影响。结果表明，与不加钙的ZK60合金相比，添加钙的ZK60合金具有更好的耐腐蚀性能，这主要是由于钙对析出相的细化和数密度的提高所致。虽然析出物与镁基体形成微电偶导致溶解，但细小致密的析出物会对腐蚀产物产生“就地钉扎”效应，形成蜘蛛网状结构，从而提高缓蚀能力。钉扎效应与析出物的大小和数密度密切相关。这项研究为先进耐蚀镁合金的设计和开发提供了重要的启示。(C)2022年重庆大学。爱思唯尔公司代表科爱通信有限公司提供的出版服务。这是一篇由重庆大学负责的CC By-NC-ND许可证(http://creativecommons.org/licenses/by-nc-nd/4.0/)同行审查下的开放获取文章
Enhancing corrosion resistance of Mg-Zn alloys with high strength and low cost was critical for broadening their large-scale practical applications. Here we prepared solutionized, peak-and over-aged ZK60 alloys with and without microalloying Ca (0.26 wt.%) to explore the effects of nanoscale precipitates on their corrosion behavior in detail via experimental analyses and theoretical calculations. The results suggested the peak-aged ZK60 alloy with Ca addition showed improved corrosion resistance in comparison with the alloys without Ca, owing to the contribution of Ca on the refinement of precipitates and increase in their number density. Although the precipitates and Mg matrix formed micro-galvanic couples leading to dissolution, the fine and dense precipitates could generate "in-situ pinning" effect on the corrosion products, forming a spider-web-like structure and improving the corrosion inhibition ability accordingly. The pinning effect was closely related to the size and number density of precipitates. This study provided important insight into the design and development of advanced corrosion resistant Mg alloys. (c) 2022 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University