Corrosion Behavior of As-Cast Pb-Mg-Al Alloys in 3.5% NaCl Solution

Duan, Yonghua; Sun, Yu; He, Jinmeng; Гуо, Ж.; Fang, Dan

doi:10.5006/0570

Cited by 9 publications

(6 citation statements)

References 9 publications

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“…Table 3 shows that the sintered alloy exhibit the highest J corr (773.3 μA cm −2 ) among the Mg-Al-Pb alloys. It is believed to be caused by the excessive intermetallic phases that acted as the cathode during the micro-galvanic corrosion [23][24][25][26]. Compared with sintered alloy, extruded alloy with more intermetallic phases showed more negative E corr .…”

Section: Potentiodynamic Polarization Test and Hydrogen Evolution Cor...mentioning

confidence: 99%

Effects of intermetallic phases on electrochemical properties of powder metallurgy Mg-6%Al-5%Pb anode alloy used for seawater activated battery

Huang¹,

Liu²,

Fang³

et al. 2022

Mater. Res. Express

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The changes in intermetallic phases of Mg-6%Al-5%Pb (Mg-Al-Pb) alloy prepared by powder metallurgy and their effects on electrochemical properties were studied. Experimental results showed that coarse Mg 17 Al 12 phases (with size ranges from 20 μm to 70 μm) and fine Mg 2 Pb phases (with the size of 100 nm scale) formed in the mixed Al、Pb and Mg powder during the hot press sintering procedure. Fine Mg 2 Pb phases exhibit strong diffusional ability to diffuse into Mg 17 Al 12 phases. Extruding further promotes the diffusion of Mg 2 Pb phases into Mg 17 Al 12 phases. Solution treatment produced a mixed microstructure which is Mg 17 Al 12 phase containing Mg 2 Pb phases inside and made other Mg 2 Pb phases homogeneously distributed in Mg matrix. Mg 17 Al 12 phases and the gathered Mg 2 Pb phases will accumulate the Mg(OH) 2 corrosion products, which impedes the subsequent discharge behavior. Homogeneously distributed Mg 2 Pb phases will fall off during discharge, which makes the discharge curve more stable. The mixed microstructure has positive effect on corrosion resistance and discharge potential. Therefore, solution-treated alloy shows the highest negative potential and the smoothest curve during the galvanostatic discharge test. Compared with the commercial AZ61 sheet, solution-treated alloy exhibit much higher anode properties in Mg/PbCl2 battery test. Thus, the solution-treated alloy could serve as an excellent anode in seawater-activated batteries.

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Section: Potentiodynamic Polarization Test and Hydrogen Evolution Cor...mentioning

confidence: 99%

Effects of intermetallic phases on electrochemical properties of powder metallurgy Mg-6%Al-5%Pb anode alloy used for seawater activated battery

Huang¹,

Liu²,

Fang³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

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“…Bi, Sn, and Pb were reported to intensify hydrogen release accompanying the corrosion of Mg alloys owing to the formation of intermetallic phases Mg 3 Bi 2 , Mg 2 Sn, and Mg 2 Pb. With their respective corrosion potentials of −1463, −1498 and −1002 mV (measured in 3.5 wt.% NaCl solution), those compounds are ‘cathodic’ to the Mg phase (−1669 mV) [ 95 , 96 , 97 ]. In recent years, prices for bismuth have decreased considerably [ 98 ], while tin and lead are known as available and inexpensive materials.…”

Section: Introductionmentioning

confidence: 99%

Effects of Bi–Sn–Pb Alloy and Ball-Milling Duration on the Reactivity of Magnesium–Aluminum Waste-Based Materials for Hydrogen Production

et al. 2023

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In the present study, composite materials were elaborated of mixed scrap of Mg-based casting alloys and low melting point Bi–Sn–Pb alloy by high energy ball milling, and their reactivity in NaCl solution with hydrogen release was tested. The impacts of the additive content and ball milling duration on their microstructure and hydrogen generation performance were investigated. Scanning electron microscopy (SEM) analysis revealed significant microstructural transformations of the particles during milling, and X-ray diffraction analysis (XRD) proved the formation of new intermetallic phases Mg3Bi2, Mg2Sn, and Mg2Pb. The said intermetallic phases were anticipated to act as ‘microcathodes’ enhancing galvanic corrosion of the base metal. The dependency of the samples’ reactivity on the additive content and milling duration was determined to be nonmonotonic. For the samples with 0, 2.5, and 5 wt.% Rose alloy, ball-milling during 1 h provided the highest hydrogen generation rates and yields (as compared to 0.5 and 2 h), while in the case of the maximum 10 wt.%, the optimal time shifted to 0.5 h. The sample activated with 10 wt.% Rose alloy for 0.5 h provided the highest ‘metal-to-hydrogen’ yield and rapid reaction, thus overperforming those with lower additive contents and that without additives.

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“…Sn and Pb were reported to enhance hydrogen release accompanying the corrosion of Mg-based alloys due to the formation of intermetallic Mg 2 Sn and Mg 2 Pb phases. With their respective corrosion potentials of −1498 and –1002 mV (measured in 3.5 wt.% NaCl solution), those compounds are ‘cathodic’ to the Mg phase (–1669 mV) [ 71 , 72 ]. Tin and lead are widely available and inexpensive materials.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Hydrogen Generation from Magnesium–Aluminum Scrap Ball Milled with Low Melting Point Solder Alloy

et al. 2023

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In this investigation, composite materials were manufactured of mixed scrap of Mg-based alloys and low melting point Sn–Pb eutectic by high energy ball milling, and their hydrogen generation performance was tested in NaCl solution. The effects of the ball milling duration and additive content on their microstructure and reactivity were investigated. Scanning electron microscopy (SEM) analysis indicated notable structural transformations of the particles during ball milling, and X-ray diffraction analysis (XRD) proved the formation of new intermetallic phases Mg2Sn and Mg2Pb, which were aimed to augment galvanic corrosion of the base metal. The dependency of the material’s reactivity on the activation time and additive content occurred to be non-monotonic. For all tested samples ball milling during the 1 h provided, the highest hydrogen generation rates and yields as compared to 0.5 and 2 h and compositions with 5 wt.% of the Sn–Pb alloy, demonstrated higher reactivity than those with 0, 2.5, and 10 wt.%.

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Corrosion Behavior of As-Cast Pb-Mg-Al Alloys in 3.5% NaCl Solution

Cited by 9 publications

References 9 publications

Effects of intermetallic phases on electrochemical properties of powder metallurgy Mg-6%Al-5%Pb anode alloy used for seawater activated battery

Effects of intermetallic phases on electrochemical properties of powder metallurgy Mg-6%Al-5%Pb anode alloy used for seawater activated battery

Effects of Bi–Sn–Pb Alloy and Ball-Milling Duration on the Reactivity of Magnesium–Aluminum Waste-Based Materials for Hydrogen Production

Enhanced Hydrogen Generation from Magnesium–Aluminum Scrap Ball Milled with Low Melting Point Solder Alloy

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