Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr合金在3.5wt-%NaCl溶液中的腐蚀行为和性能

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Engineering, Science and Technology Pub Date : 2022-08-05 DOI:10.1080/1478422X.2022.2106285

Wenli Wang, Jing Ke, Lintong Guo

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引用次数: 1

摘要

镁合金的腐蚀性能较差，限制了其应用。研究了Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr合金在3.5wt-%NaCl溶液中的腐蚀行为，结果表明，稀土相（Mg，Zn）3（Y，Sm）和Mg12（Y，Smi）Zn的析出有利于提高镁合金的耐蚀性。网状第二相（Mg，Zn）3（Y，Sm）可以用作阳极。它可以与相邻的α-Mg基体形成电偶，有效保护α-Mg基质。Mg12（Y，Sm）Zn相的存在使（Mg，Zn）3（Y，Smi）相的分布更加均匀，这可以产生更加均匀的电化学结构并减少电偶腐蚀。在两种第二相的双重作用下，Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr合金的腐蚀性能优于标准AZ31B合金。合金的腐蚀机制是由于低电位的第二相引起的电偶腐蚀。

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Corrosion behaviour and properties of Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr Alloy in 3.5 wt-% NaCl solution

ABSTRACT The applications of magnesium alloys are limited because of their poor corrosion properties. In this study, the corrosion behaviours of Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr alloy in 3.5 wt-% NaCl solution were investigated, the results suggested that the precipitations of rare-earth phase, (Mg, Zn)3(Y, Sm) and Mg12(Y, Sm) Zn, are beneficial to enhance the anti-corrosion of magnesium alloys. The network second phase, (Mg, Zn)3(Y, Sm), may act as an anode. It can form a galvanic couple with the adjacent α-Mg matrix and effectively protect the α-Mg matrix. The existence of the Mg12(Y, Sm) Zn phase makes the distribution of the (Mg, Zn)3(Y, Sm) phase more uniform, which may produce a more uniform electrochemical structure and reduce the galvanic corrosion. Under the dual action of the two second phases, the corrosion performance of Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr alloy was better than that of the standard AZ31B alloy. The corrosion mechanism of the alloy is galvanic corrosion due to the second phase with low potential.

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来源期刊

Corrosion Engineering, Science and Technology 工程技术-材料科学：综合

CiteScore

3.20

自引率

5.60%

发文量

审稿时长

3.4 months

期刊介绍： Corrosion Engineering, Science and Technology provides broad international coverage of research and practice in corrosion processes and corrosion control. Peer-reviewed contributions address all aspects of corrosion engineering and corrosion science; there is strong emphasis on effective design and materials selection to combat corrosion and the journal carries failure case studies to further knowledge in these areas.