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

  • Materials, Metallurgy, Chemical and Environmental Engineering
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Abstract

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 Mg17Al12 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 Mg2Pb and Mg17Al12 somewhat increase corrosion resistance but lighten anodic polarization by facilitating corrosion product flaking off.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Yantai Nanshan University, Yantai, 265713, China

    Li Wen  (文利), Kun Yu  (余琨), Hong-jie Fang  (房洪杰), Han-qing Xiong  (熊汉青), Hua-long Zhu  (朱化龙), Jia-ji Ma  (马家骥) & Da-yue Jiang  (姜大越)

  2. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Li Wen  (文利), Kun Yu  (余琨), Han-qing Xiong  (熊汉青) & Xiang Yin  (尹翔)

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  1. Li Wen  (文利)
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  2. Kun Yu  (余琨)
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  3. Hong-jie Fang  (房洪杰)
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  4. Han-qing Xiong  (熊汉青)
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  6. Hua-long Zhu  (朱化龙)
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Corresponding author

Correspondence to Kun Yu  (余琨).

Additional information

Foundation item: Project supported by 2015 Shandong Provincal Fund for Outstanding Talent Group, China

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Wen, L., Yu, K., Fang, Hj. et al. Electrochemical behavior of Mg-Al-Pb alloy in 3.5% NaCl solution. J. Cent. South Univ. 23, 2475–2482 (2016). https://doi.org/10.1007/s11771-016-3306-7

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  • DOI: https://doi.org/10.1007/s11771-016-3306-7

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