Abstract
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.
Highlights
Our objective is to investigate the corrosion behavior of an Mg2 Sn alloy (Mg66.7 Sn33.3, concentration in at.%)
The Mg2 Sn alloy was prepared by melting Sn and Mg lumps in argon
The alloy was prepared from high purity Sn and Mg lumps by melting them in an argon atmosphere
Summary
Behavior of an Mg2 Sn Alloy.Magnesium–tin alloys are promising candidates for high temperature applications [1].Tin has low diffusivity and reasonable solid solubility in Mg [1,2]. Magnesium–tin alloys are promising candidates for high temperature applications [1]. Tin has low diffusivity and reasonable solid solubility in Mg [1,2]. Mg is approximately an order of magnitude lower than that of Zn [3,4]. Due to the large differences in the solid solubility of Sn in Mg at high and low temperatures, intermetallic. Mg2 Sn can precipitate during solidification [2,3]. The Mg2 Sn precipitates have a low grain boundary sliding rate in high temperature environments [5]. In addition to anti-creep properties, the alloying of Mg with Sn improves the tensile strength [6], castability [7], and extrusion properties of Mg alloys [8]. The thermal conductivity of alloys decreases with increasing Sn content [9]. Mg–Sn alloys have been considered as phase change materials for thermal energy storage [10]
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