Zn含量对Mg-Y-Zn合金腐蚀行为的影响

IF 0.9 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2021-01-01 DOI:10.2298/jmmb210525048s

Y. Shi, X. Liu, Z. Liu, Huanjian Xie, Y. Wang, J. Li

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引用次数: 0

摘要

采用SEM、失重和电化学试验研究了铸态Mg-4Y-xZn (x=1,2,3,4 wt.%)的微观组织、腐蚀行为和电化学行为。Mg12YZn (X)、Mg3Y2Zn3 (W)和Mg24Y5构成了合金的相组成体系。当锌含量为1 wt.%时，合金具有最佳的腐蚀性能。在腐蚀过程中，第二相作为阴极存在，使-Mg优先发生腐蚀，加速腐蚀坑的形成。在3.5 wt.% NaCl溶液中浸泡一段时间后，W相的稳定性发生变化，逐渐溶解，最终被铬酸除去，用于去除腐蚀产物。此外，在W相形成的微原电池中，X相可以作为阳极，以降低?-Mg的腐蚀速率，从而提高合金的腐蚀性能。

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Effect of Zn content on corrosion behavior of Mg-Y-Zn alloys

The microstructure, corrosion behavior and electrochemical behavior of as-cast Mg-4Y-xZn (x=1,2,3,4 wt.%) are studied by SEM, weight loss and electrochemical tests. Mg12YZn (X), Mg3Y2Zn3 (W) and Mg24Y5 constitute the phase composition system of the alloy. When Zn content is 1 wt.%, all tests reveal that alloy has the optimal corrosion performance. The second phase in these alloys, due to their nobler nature than ?-Mg, exists as cathode during corrosion process, so that ?-Mg preferentially occurs corrosion to accelerate the formation of corrosion pits. After soaking in 3.5 wt.% NaCl solution for some time, the stability of the W phase changed, and gradually dissolved, which was finally removed by chromic acid used for removal of corrosion products. In addition, X phase can be used as an anode in the micro-galvanic cells formed with W phase to reduce the corrosion rate of ?-Mg and thus improve the corrosion performance of the alloy.

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来源期刊

Journal of Mining and Metallurgy Section B-Metallurgy 工程技术-冶金工程

CiteScore

2.00

自引率

40.00%

发文量

审稿时长

2 months

期刊介绍： University of Belgrade, Technical Faculty in Bor, has been publishing the journal called Journal of Mining and Metallurgy since 1965 and in 1997 it was divided in two independent journals dealing with mining and metallurgy separately. Since 2009 Journal of Mining and Metallurgy, Section B: Metallurgy has been accepted in Science Citation Index Expanded. Journal of Mining and Metallurgy, Section B: Metallurgy presents an international medium for the publication of contributions on original research which reflect the new progresses in theory and practice of metallurgy. The Journal covers the latest research in all aspects of metallurgy including hydrometallurgy, pyrometallurgy, electrometallurgy, transport phenomena, process control, solidification, mechanical working, solid state reactions, materials processing, surface treatment and relationships among processing, structure, and properties of materials.