The Effect of Sn Addition on Zn-Al-Mg Alloy; Part II: Corrosion Behaviour

Gabalcová, Zuzana; Gogola, Peter; Kusý, Martin; Suchánek, Henrich

doi:10.3390/ma14185290

Cited by 8 publications

(6 citation statements)

References 44 publications

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“…Recently, zinc-aluminum-magnesium (Zn-Al-Mg) coatings have been innovated through hot-dip plating technology, which has attracted more and more attention due to its excellent corrosion resistance and self-healing capabilities [4,5,[12][13][14]. Previous studies have indicated that the addition of Mg and Al elements to the molten bath undergoes eutectic reactions, resulting in the generation of various alloy phases such as MgZn 2 , which may form the Zn/MgZn 2 binary eutectic phase or Zn/Al/MgZn 2 ternary eutectic phase.…”

Section: Introductionmentioning

confidence: 99%

Roles of Al and Mg on the Microstructure and Corrosion Resistance of Zn-Al-Mg Hot-Dipped Coated Steel

Guo,

Wang,

et al. 2024

Materials

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In this work, a novel zinc–aluminum–magnesium (Zn-Al-Mg, ZM) coated steel was prepared using the hot-dip method. The microstructure and corrosion resistance of the ZM-coated steel were investigated. Compared to the conventional galvanized steel (GI), the ZM coating demonstrated a distinctive phase structure, consisting of Zn phase, binary eutectic (Zn/MgZn2), and ternary eutectic (Zn/Al/MgZn2). The corrosion resistance of the ZM-coated and GI-coated steels was evaluated by neutral salt spray test (NSST), polarization and electrochemical impedance spectroscopy (EIS). The results indicated that ZM-coated steel provided superior long-term corrosion protection in a NaCl environment compared to GI-coated steel. The scanning vibrating electrode technique (SVET) proved to be an effective method for investigating the evolution of the anodic and cathodic on the local coating surface. GI-coated steel exhibited a potential and current density distribution between the cathodic and anodic sites nearly three orders of magnitude higher than that of ZM-coated steel, suggesting a higher corrosion rate for GI-coated steel.

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Section: Introductionmentioning

confidence: 99%

Roles of Al and Mg on the Microstructure and Corrosion Resistance of Zn-Al-Mg Hot-Dipped Coated Steel

Guo,

Wang,

et al. 2024

Materials

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“…Zinc-aluminum-magnesium coatings are generally divided into three categories (a low-aluminum series with an Al content of 1.0-2.5 wt.%, a medium-aluminum series with an Al content of 6.0%-11 wt.%, and a high-aluminum series with an Al content of 50%-60 wt.%) [6][7][8]. The main research object of this study was low-aluminum coatings, which are currently also the most widely applied.…”

Section: Introductionmentioning

confidence: 99%

“…After MgZn 2 dissolves, it provides Mg 2+ cations and reacts with OH − to form Mg(OH) 2 precipitates, while Zn 2+ and Zn(OH) 2 eventually form ZnO. The precipitation of Mg(OH) 2 lowers the pH value, thereby creating the thermodynamic conditions for the formation of the water-insoluble simonkolleite (Zn 5 Cl 2 (OH) 8 •H 2 O) [13][14][15]. However, partial studies show that due to the relatively poor stress-strain behavior of MgZn 2 , it is easy to produce cracks during deformation processing, which leads to a decrease in the material performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al/Mg Ratio on the Microstructure and Phase Distribution of Zn-Al-Mg Coatings

Zhang,

Zhao

et al. 2023

Metals

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In contrast with studies such as those on the effect of a single elemental variable on Zn-Al-Mg coatings, Mg/Al is considered a variable parameter for evaluating the microstructure of Zn-Al-Mg coatings in this work, and the combined effect of the two elements is also taken into account. The Mg/Al ratios in the continuous hot-dip plating of low-alumina Zn-Al-Mg coatings were 0.63, 0.75, 1.00, 1.25, and 1.63. respectively, and the microstructures of the different coatings were observed using scanning electron microscopy (SEM). The surface elemental distributions of the coatings were analyzed with energy dispersive spectrometry (EDS) and X-ray diffraction (XRD) analysis to understand the phase distributions of the coatings, which mainly consisted of a zinc monomeric phase, a binary eutectic phase (Zn/MgZn2), and a ternary eutectic phase (Zn/Al/MgZn2). Statistical calculations of the phase distributions in colored SEM images were performed using ImageJ-win64 software, comparative analysis of the solidification simulation results was carried out with thermodynamic simulation software (PANDAT-2023), and evaluation of the corrosion resistance of the platings was performed using macroscopic cyclic immersion corrosion experiments. The results show that with the increase in the Mg/Al ratio, the binary eutectic phase in the coatings gradually increased, the variation trend of the ternary eutectic phase was not obvious, and the corrosion resistance of the coatings gradually improved.

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“…The phase was found to be nobler than Mg 2 Zn 11 and MgZn 2 . Furthermore, we observed a local de-alloying of Mg 2 Sn particles [ 21 ]. The Mg concentration in Mg 2 Sn was gradually reduced during corrosion, resulting in the production of Sn-rich particles in place of Mg 2 Sn particles.…”

Section: Introductionmentioning

confidence: 99%

“…The wide range of compositional solid solubility constitutes an opportunity for designing Mg–Sn alloys with tunable electrochemical properties. Most previous studies have investigated the effect of Sn concentration in selected solid solution Mg 100x –Sn x alloys (x = 1–3 at.%) on their electrochemical performance in chloride-containing electrolytes [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Nevertheless, alloys with Sn concentration higher than 3 at.% have been significantly less explored.…”

Section: Introductionmentioning

confidence: 99%

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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The Effect of Sn Addition on Zn-Al-Mg Alloy; Part II: Corrosion Behaviour

Cited by 8 publications

References 44 publications

Roles of Al and Mg on the Microstructure and Corrosion Resistance of Zn-Al-Mg Hot-Dipped Coated Steel

Roles of Al and Mg on the Microstructure and Corrosion Resistance of Zn-Al-Mg Hot-Dipped Coated Steel

Effect of Al/Mg Ratio on the Microstructure and Phase Distribution of Zn-Al-Mg Coatings

Corrosion Behavior of an Mg2Sn Alloy

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