Electrochemical behavior of Mg-Al-Pb alloy in 3.5% NaCl solution

An investigation on electrochemical behavior of Mg-5%Pb alloy, Mg-6%Al alloy and Mg-6%Al-5%Pb alloy (mass fraction) in 3.5% NaCl (mass fraction) solution was conducted using electrochemical measurements and corroded morphology observation, in which solid solution and the as-aged state of each alloy...

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Bibliographic Details
Published in:Journal of Central South University 2016-10, Vol.23 (10), p.2475-2482
Main Authors: Wen, Li, Yu, Kun, Fang, Hong-jie, Xiong, Han-qing, Yin, Xiang, Zhu, Hua-long, Ma, Jia-ji, Jiang, Da-yue
Format: Article
Language:English
Subjects:
Aluminum base alloys
Chemical and Environmental Engineering
Corrosion currents
Corrosion resistance
Engineering
Grain boundaries
Magnesium base alloys
Materials
Metallic Materials
Metallurgy
X-ray diffraction
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Summary:An investigation on electrochemical behavior of Mg-5%Pb alloy, Mg-6%Al alloy and Mg-6%Al-5%Pb alloy (mass fraction) in 3.5% NaCl (mass fraction) solution was conducted using electrochemical measurements and corroded morphology observation, in which solid solution and the as-aged state of each alloy were compared to discuss the influence mechanism of lead and aluminium on the electrochemical properties of alloys. The X-ray diffraction (XRD) analysis was performed to make microstructure characterization. The electrochemical results indicate that the corrosion of Mg-5%Pb alloy is predominated by homogeneous pitting and dissolution of PbCl2 film due to Cl ions attack, while corrosion crevice propagates along grain boundaries in solid solution of Mg-6%Al alloy and the micro galvanic corrosion also plays vital role in Mg 17 Al 12 phase containing experimental alloys. The co-existence of lead and aluminium in magnesium alloy increases corrosion current density and electrochemical activity as well. The comparison between solid solution and the as-aged state demonstrates that Mg 2 Pb and Mg 17 Al 12 somewhat increase corrosion resistance but lighten anodic polarization by facilitating corrosion product flaking off.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-016-3306-7