Purpose

The influence of Zn concentration on microstructure and corrosion performance of the Mg–xZn alloys microalloyed with Ca and Ce was investigated through optic microscopy, scanning electron microscopy, hydrogen evolution, dynamic polarization and electrochemical impedance spectroscopy experiments.

Design/methodology/approach

In this paper, Mg–xZn alloys (x = 0.5∼2.0 Wt.%) microalloyed with Ca and Ce (0.2 Wt.% each) were prepared.

Findings

As the increase of Zn concentration, the number of second phase particles (Mg-Zn-Ca, Mg-Zn-Ce and Mg-Ce phases) increased, and when the Zn concentration increased to 2.0 Wt.%, the new second phase Mg-Zn phase was precipitated.

Originality/value

The influence of Zn concentration on corrosion mechanism of Mg-xZn alloys microalloyed with Ca and Ce was revealed. Increasing of the Zn concentration resulted in the intensification of galvanic corrosion. When Zn concentration was 0.5 Wt.%, the alloy showed the lowest corrosion rate (0.61 mm y-1), which was about 1/2 of that of Mg-2.0Zn-0.2Ca-0.2Ce alloy.

中文翻译：

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锌浓度对Ca和Ce微合金化Mg-Zn合金显微组织和耐蚀性的影响

目的

通过光学显微镜，扫描电子显微镜，氢析出，动态极化和电化学阻抗谱实验研究了锌浓度对微合金化钙和铈的Mg-xZn合金的组织和腐蚀性能的影响。

设计/方法/方法

在本文中，制备了由Ca和Ce微合金化的Mg–xZn合金（x = 0.5〜2.0 Wt。％）（每种为0.2 Wt。％）。

发现

随着锌浓度的增加，第二相颗粒（Mg-Zn-Ca，Mg-Zn-Ce和Mg-Ce相）的数量增加，并且当Zn浓度增加到2.0 Wt。％时，新的第二相Mg -Zn相沉淀。

创意/价值

揭示了锌浓度对Ca和Ce微合金化的Mg-xZn合金腐蚀机理的影响。锌浓度的增加导致电腐蚀的加剧。当Zn浓度为0.5Wt。％时，合金显示出最低的腐蚀速率（0.61mm y-1），约为Mg-2.0Zn-0.2Ca-0.2Ce合金的腐蚀速率的1/2。