Effects of Mg content on pore structure and electrochemical corrosion behaviors of porous Al-Mg alloys

• Published in: Journal of Central South University Vol. 23; no. 10; pp. 2483 - 2491
• Main Authors: He, Wen-yuan, Xiao, Yi-feng, Wu, Liang, Xu, Yan-fei, Qian, Jin-wen, He, Yue-hui, Zheng, Xue-jun
• Format: Journal Article
• Language: English
• Published: Changsha Central South University 01.10.2016; Springer Nature B.V
• Subjects: Aluminum base alloys; Aqueous solutions; Chemical and Environmental Engineering; Corrosion resistance; Electrochemical corrosion; Engineering; Magnesium; Materials; Metallic Materials; Metallurgy; Pore formation; Porosity; Porous materials; reactive synthesis; porous Al-Mg alloys; pore structure; electrochemical corrosion behaviors
• ISSN: 2095-2899; 2227-5223
• DOI: 10.1007/s11771-016-3307-6

Porous Al-Mg alloys with different nominal compositions were successfully fabricated via elemental powder reactive synthesis, and the phase composition, pore structure, and corrosion resistance were characterized with X-ray diffractometer, scanning electron microscope and electrochemical analyzer. The volume expansion ratio, open porosity and corrosion resistance in 3.5% (mass fraction) NaCl aqueous solution of the alloys increase at first and then decrease with the increase of Mg content. The maxima of volume expansion ratio and open porosity are 18.3% and 28.1% for the porous Al-56%Mg (mass fraction) alloy, while there is the best corrosion resistance for the porous Al-37.5% Mg (mass fraction) alloy. The pore formation mechanism can be explained by Kirkendall effect, and the corrosion resistance can be mainly affected by the phase composition for the porous Al-Mg alloys. They would be of the potential application for filtration in the chloride environment.