Effect of Cu addition on microstructure and corrosion behavior of Al–15Mg2Si composite

IF 2.4 4区 材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
L. Hesami, R. Taghiabadi, M. Ghoncheh, M. Emami, M. Saghafi Yazdi
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引用次数: 0

Abstract

Abstract The Cu effect on the microstructure and corrosion resistance of Al–15Mg2Si composites was studied. The results showed that Cu addition decreased the average size of primary Mg2Si (Mg2SiP) particles, changed the hopper-like Mg2SiP particles to polyhedrals, and caused the formation of θ-Al2Cu and Q-Al5Mg8Si6Cu2 compounds in the composite matrix. According to the image analysis results, increasing the Cu content from 0.01 to 5 wt% halved the average size of Mg2SiP particles, increased their fraction by about 40 %, and increased the composite porosity content. The electrochemical impedance spectroscopy showed that adding 5 wt% of Cu resulted in an increase of about 3.7 times in the corrosion resistance as compared to Al–15Mg2Si composite. The beneficial effects of Cu were also confirmed by the potentiodynamic polarization experiments. Cu addition seems to promote less intense general corrosion than the base alloy’s localized attack.
Cu添加对Al-15Mg2Si复合材料组织和腐蚀行为的影响
摘要:研究了Cu对Al-15Mg2Si复合材料显微组织和耐蚀性的影响。结果表明:Cu的加入降低了初生Mg2Si (Mg2SiP)颗粒的平均尺寸,使呈漏斗状的Mg2SiP颗粒转变为多面体,并导致复合基体中θ-Al2Cu和Q-Al5Mg8Si6Cu2化合物的形成;图像分析结果表明,当Cu含量从0.01 wt%增加到5 wt%时,Mg2SiP颗粒的平均尺寸减半,其分数增加约40 %,复合孔隙率增加。电化学阻抗谱分析表明,与Al-15Mg2Si复合材料相比,添加5 wt%的Cu可使复合材料的耐蚀性提高约3.7倍。动电位极化实验也证实了Cu的有益作用。与基体合金的局部腐蚀相比,Cu的加入似乎促进了较弱的一般腐蚀。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Materials Testing
Materials Testing 工程技术-材料科学:表征与测试
CiteScore
4.20
自引率
36.00%
发文量
165
审稿时长
4-8 weeks
期刊介绍: Materials Testing is a SCI-listed English language journal dealing with all aspects of material and component testing with a special focus on transfer between laboratory research into industrial application. The journal provides first-hand information on non-destructive, destructive, optical, physical and chemical test procedures. It contains exclusive articles which are peer-reviewed applying respectively high international quality criterions.
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