Abstract
Pb-39Mg-10Al-1B-Y alloys with Y = 0, 0.2, 0.4, 0.6, 0.8, and 1.0 (wt.%) were fabricated by melting and casting. The microstructure and electrochemical corrosion behavior of the Pb-39Mg-10Al-1B-Y alloys in a 3.5 wt.% NaCl solution were investigated using x-ray diffraction, electron probe microanalysis, and scanning electron microscopy, polarization curve tests, electrochemical impedance spectroscopy (EIS), and electrochemical noise (EN). Mg2Pb + Pb eutectic gains are refined, and the distribution of Mg17Al12 + Mg eutectic gains becomes continuous by with the addition of Y. The polarization curves, EIS results and EN results show that the corrosion resistance of the alloys with various Y concentrations is in the order 0.8 > 1 > 0.6 > 0.4 > 0.2 > 0. The primary corrosion behaviors of Pb-39Mg-10Al-1B-Y alloys when Y ≤ 0.4 wt.% and Y > 0.4 wt.% are general corrosion and localized corrosion, respectively. There is a Mg-Mg2Pb galvanic cell present with Mg2Pb as the cathode and Mg as the anode. Moreover, Cl− can accelerate the corrosion of the Mg phase.
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This work was supported by the Yunnan Ten Thousand Talents Plan Young & Elite Talents Project under Grant No. YNWR-QNBJ-2018-044 and the National Natural Science Foundation of China under Grant No. 51761023.
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Feng, Z., Bao, W., Bao, L. et al. Effects of Yttrium on the Microstructure and Corrosion Behavior of Pb-39Mg-10Al-1B-Y Alloys. J. of Materi Eng and Perform 30, 77–88 (2021). https://doi.org/10.1007/s11665-020-05317-4
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DOI: https://doi.org/10.1007/s11665-020-05317-4