Effect of Microstructure Features on the Corrosion Behavior of the Sn-2.1 wt%Mg Solder Alloy

Cruz, Clarissa; Lima, Thiago S.; Soares, Marco César Prado; Freitas, Emmanuelle S.; Fujiwara, Eric; Garcia, Amauri; Cheung, Noé

doi:10.1007/s13391-020-00202-7

Cited by 6 publications

(10 citation statements)

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“…To further probe the effects of chemical composition, we have compared the corrosion currents and corrosion potentials of the Mg 2 Sn alloy with those of previously studied Mg–Sn alloys [ 15 , 16 , 17 , 24 , 25 , 48 , 49 ]. The dependence of the electrochemical parameters ( E corr , j corr ) on the Sn atomic fraction is compared in Figure 9 a,b.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the alloys compared had different microstructures and different Mg 2 Sn volume fractions. The Mg 2 Sn fraction, grain size and interphase spacing were found to influence the corrosion behavior [ 16 , 25 ]. A better corrosion resistance was found for more refined microstructures.…”

Section: Resultsmentioning

confidence: 99%

“…As such, Sn-rich Mg–Sn alloys are potential candidates for lead-free soldering. The corrosion resistance of an Mg 9.5 Sn 90.5 alloy has been reported to be lower compared to conventional Mg alloys [ 25 ]. It has been observed that the presence and distribution of the Mg 2 Sn phase in the Sn rich matrix promotes the formation of Sn/Mg 2 Sn galvanic pairs.…”

Section: Introductionmentioning

confidence: 99%

“…The microstructure formed by more refined fibers presents a surface with the circularly shaped Mg 2 Sn phase evenly distributed in the Sn matrix. This microstructural configuration leads to the formation of tin oxide corrosion products that inhibit the evolution of H 2 [ 25 ]. On the other hand, the reaction kinetics for the coarse microstructure alloy is increased, resulting in a higher hydrogen evolution rate.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion Behavior of an Mg2Sn Alloy

et al. 2022

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In the present work, the corrosion behavior of the Mg2Sn alloy (Mg66.7Sn33.3, concentration in at.%) has been studied. The alloy was prepared from high purity Sn and Mg lumps by induction melting in argon. The alloy was composed of intermetallic Mg2Sn with a small amount of Mg2Sn + (Sn) eutectic. The corrosion behavior was studied by hydrogen evolution, immersion, and potentiodynamic experiments. Three aqueous solutions of NaCl (3.5 wt.%), NaOH (0.1 wt.%) and HCl (0.1 wt.%) were chosen as corrosion media. The alloy was found to be cathodic with respect to metallic Mg and anodic with respect to Sn. The corrosion potentials of the Mg2Sn alloy were −1380, −1498 and −1361 mV vs. sat. Ag/AgCl in HCl, NaCl and NaOH solutions, respectively. The highest corrosion rate of the alloy, 92 mmpy, was found in aqueous HCl. The high corrosion rate was accompanied by massive hydrogen evolution on the alloy’s surface. The corrosion rate was found to decrease sharply with increasing pH of the electrolyte. In the NaOH electrolyte, a passivation of the alloy was observed. The corrosion of the alloy involved a simultaneous oxidation of Mg and Sn. The main corrosion products on the alloy surface were MgSn(OH)6 and Mg(OH)2. The corrosion mechanism is discussed and implications for practical applications of the alloy are provided.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion Behavior of an Mg2Sn Alloy

et al. 2022

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“…Figure 1b shows the cooling rate varying with position along the length of the casting, which is a characteristic of the unsteady-state solidification process. It can be seen thatṪ decreased with the progress of solidification from the cooled bottom of the casting due to two reasons: 1) The continuous growth from bottom to top of the casting increases progressively the thermal resistance of the solid layer; [32] 2) the thermal and volumetric shrinkage accompanying the solidification of the casting generates an increasing gap between the casting and the mold wall, thus inducing an interfacial thermal resistance that increases over time. [33,34] In previous studies, [35][36][37][38][39] the fishbone morphology was reported to be dependent onṪ and V and on the composition of the alloy.…”

Section: Resultsmentioning

confidence: 99%

Morphology of Intermetallics Tailoring Tensile Properties and Quality Index of a Eutectic Al–Si–Ni Alloy

2020

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The Al-Si-Ni alloy system is a source of multicomponent piston alloys, which combine good castability and wear resistance of Al-Si alloys with great thermal stability and corrosion resistance of Al-Ni alloys. [1-3] The inherent high piston temperature during engine functioning is one of the limiting factors for the application of Al-Si-based alloys. [4] On the other hand, alloys containing Al-Ni-based intermetallic compounds (IMCs) are mainly used for high-temperature structural products, which also demand wear resistance, such as aircraft engines, turbine vanes, and guide vanes of industrial steam turbines. [5,6] The formation of Ni-rich IMCs occurs even for low Ni concentrations, [7] as Ni is almost insoluble in aluminum, with a solubility of about 0.05 wt% at 640 ºC and less than 0.005 wt% at 450 ºC. [8] Thus, the addition of Ni to Al─Si alloys can potentially improve their wear resistance at elevated temperatures. Once the second phases are responsible for these characteristics, the modification of the microstructure, regarding its refinement, usually improves the properties and extends the lifetime of the component. Apart from the formation of different IMCs, the addition of new alloying elements can promote modification of other phases, mainly on Si. Kaya and Aker [9] studied ternary Al-12.6 wt% Si-2 wt% X alloys, where X was Cu, Co, Ni, Sb, or Bi. They verified that the addition of Co promotes a better distribution of Si flakes (i.e., smallest interflake spacings) and, consequently, highest hardness and tensile strength are achieved. Although the addition of Cu induced the least efficient refinement effect, the Al-12.6 wt% Si-2 wt% Cu alloy showed the second highest tensile properties. This occurred probably due to the formation of a supersaturated solid solution and hard Al 2 Cu particles. As Al 2 Cu and Al 9 Co 2 have similar hardness (588 [10] and 568 HV, [11] respectively), and Co is restricted to the formation of Al 9 Co 2 , the refinement of Si seems to have a major effect on mechanical properties. The aforementioned alloying elements are not modifiers of the eutectic Si morphology, but they just decrease the interflake spacing. Sr is a strong modifier, which is capable of transforming the acicular Si in welldistributed fibers with only a few hundred parts per million. In an Al-10 wt% Si alloy, 240 ppm of Sr has the same effect as 520 ppm of Ti-B grain refiner in terms of tensile properties. [12] Another Si modifier, Sc, also decreases the secondary dendritic arm spacing and refines the grain size; however, it requires an amount 20 times greater than that of Sr to improve the mechanical properties at the same level. [13] In secondary aluminum, Mn, [14,15] Cr, [16,17] Ni, [18,19] and other alloying elements are added to suppress the precipitation of harmful β-AlFeSi, aiming at the formation of α-AlFeSi, which has a Chinese-script morphology. Even though modification is, in general, desirable, excessive addition can lead to overmodification. Riestra et al. [20] observed in Al-11 wt% Mg 2 Si alloys, in ...

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