The effect of Sr addition on the microstructure and corrosion behaviour of a Mg-Zn-Ca alloy
发布时间：2022-06-10
点击次数：
DOI码：10.1016/j.surfcoat.2022.128328
发表刊物：Surface & Coatings Technology
关键字：Magnesium alloy; Hydrogen evolution test; Electrochemical impedance spectroscopy; Microstructure characterization
摘要：The application of magnesium alloys is rather limited due to their poor corrosion resistance despite of their promising mechanical properties. Alloying is considered one of the most efficient methods to influence the corrosion susceptibility of Mg alloys either by altering the bulk microstructures or by changing the surface chemistries. In the present study, the effects of Sr addition on the microstructure and corrosion properties of a Mg-Zn-Ca alloy were studied. The microstructure characteristics of the alloys were investigated using optical microscopy, scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy, while the corrosion properties were evaluated by hydrogen collection method and electrochemical techniques including potentiodynamic polarization and electrochemical impedance spectroscopy. The results indicate that Sr addition significantly deteriorates the corrosion performance of the Mg-Zn-Ca alloy mainly by forming more micro-galvanic couples due to the precipitation of the more populous secondary phase particles. The corrosion prod-uct film accumulated on the sample surface marginally affects the corrosion resistance, as their compactness is rather compromised as the immersion time is prolonged.
合写作者：Y.H. Gao*, C.M. Liu, Z.Y. Chen
第一作者：J. Song
论文类型：期刊论文
文献类型：J
卷号：437
页面范围：128328
ISSN号：0257-8972
是否译文：否
发表时间：2022-05-15