Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions
In the present research the electrochemical behavior of the Sn-Zn alloys (Sn-1. wt.%Zn, Sn-4. wt.%Zn and 8.9. wt.%Zn) in 3% NaCl solution is analyzed using potentiodynamic cyclic polarization measurements and Electrochemical Impedance Spectroscopy (EIS) technique. Specimens were longitudinally solid...
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2016
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18785352_v_n_p_Mendez http://hdl.handle.net/20.500.12110/paper_18785352_v_n_p_Mendez |
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paper:paper_18785352_v_n_p_Mendez2023-06-08T16:30:17Z Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions Corrosion EIS Grain structures NaCl Sn-Zn alloys Behavioral research Corrosion Crystal microstructure Electrochemical corrosion Electrochemical impedance spectroscopy Electrodes Equivalent circuits Grain size and shape Pitting Polarization Tin Zinc Zinc alloys Corrosion products Electrochemical behaviors Interdendritic zones Longitudinal section NaCl Polarization curves Potentiodynamic cyclic polarizations Zn alloys Tin alloys In the present research the electrochemical behavior of the Sn-Zn alloys (Sn-1. wt.%Zn, Sn-4. wt.%Zn and 8.9. wt.%Zn) in 3% NaCl solution is analyzed using potentiodynamic cyclic polarization measurements and Electrochemical Impedance Spectroscopy (EIS) technique. Specimens were longitudinally solidified with simultaneous heat extraction in two opposite directions. Working electrodes were constructed using longitudinal and cross sections of the specimens with both types of structure: columnar and equiaxed.Results obtained from the polarization curves indicated that the two types of grain structures of Sn-Zn alloys (Sn-1. wt.%Zn, Sn-4. wt.%Zn and Sn-8.9. wt.%Zn) corresponding to longitudinal section present a pseudo passive zone. In the case of specimens from cross sections of the samples, the columnar and equiaxed zones of Sn-8.9. wt.%Zn are the only ones that do not have this pseudo passive region. In addition, the interdendritic zone of alloys is susceptible to corrosion by dealloying because this phase is zinc-rich. This type of corrosion also occurs in the zinc rich lamellar structure present in the eutectic. The percentage of zinc in the alloy increases with increasing susceptibility to pitting corrosion. The EIS values obtained revealed that the susceptibility to corrosion increases with increasing zinc content in alloys, for both the columnar and equiaxed zones. In addition, the columnar zones of Sn-4. wt.%Zn and Sn-8.9. wt.%Zn specimens are more resistant to corrosion than the equiaxed grain specimens. However, the equiaxed zone of Sn-1. wt.%Zn alloy is less susceptible to corrosion than the columnar zone. After adjustment by equivalent circuits it is revealed that the equiaxed zone of Sn-8.9. wt.%Zn alloy has a second porous layer composed of corrosion products on the electrode surface. © 2016 The Authors. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18785352_v_n_p_Mendez http://hdl.handle.net/20.500.12110/paper_18785352_v_n_p_Mendez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Corrosion EIS Grain structures NaCl Sn-Zn alloys Behavioral research Corrosion Crystal microstructure Electrochemical corrosion Electrochemical impedance spectroscopy Electrodes Equivalent circuits Grain size and shape Pitting Polarization Tin Zinc Zinc alloys Corrosion products Electrochemical behaviors Interdendritic zones Longitudinal section NaCl Polarization curves Potentiodynamic cyclic polarizations Zn alloys Tin alloys |
| spellingShingle |
Corrosion EIS Grain structures NaCl Sn-Zn alloys Behavioral research Corrosion Crystal microstructure Electrochemical corrosion Electrochemical impedance spectroscopy Electrodes Equivalent circuits Grain size and shape Pitting Polarization Tin Zinc Zinc alloys Corrosion products Electrochemical behaviors Interdendritic zones Longitudinal section NaCl Polarization curves Potentiodynamic cyclic polarizations Zn alloys Tin alloys Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions |
| topic_facet |
Corrosion EIS Grain structures NaCl Sn-Zn alloys Behavioral research Corrosion Crystal microstructure Electrochemical corrosion Electrochemical impedance spectroscopy Electrodes Equivalent circuits Grain size and shape Pitting Polarization Tin Zinc Zinc alloys Corrosion products Electrochemical behaviors Interdendritic zones Longitudinal section NaCl Polarization curves Potentiodynamic cyclic polarizations Zn alloys Tin alloys |
| description |
In the present research the electrochemical behavior of the Sn-Zn alloys (Sn-1. wt.%Zn, Sn-4. wt.%Zn and 8.9. wt.%Zn) in 3% NaCl solution is analyzed using potentiodynamic cyclic polarization measurements and Electrochemical Impedance Spectroscopy (EIS) technique. Specimens were longitudinally solidified with simultaneous heat extraction in two opposite directions. Working electrodes were constructed using longitudinal and cross sections of the specimens with both types of structure: columnar and equiaxed.Results obtained from the polarization curves indicated that the two types of grain structures of Sn-Zn alloys (Sn-1. wt.%Zn, Sn-4. wt.%Zn and Sn-8.9. wt.%Zn) corresponding to longitudinal section present a pseudo passive zone. In the case of specimens from cross sections of the samples, the columnar and equiaxed zones of Sn-8.9. wt.%Zn are the only ones that do not have this pseudo passive region. In addition, the interdendritic zone of alloys is susceptible to corrosion by dealloying because this phase is zinc-rich. This type of corrosion also occurs in the zinc rich lamellar structure present in the eutectic. The percentage of zinc in the alloy increases with increasing susceptibility to pitting corrosion. The EIS values obtained revealed that the susceptibility to corrosion increases with increasing zinc content in alloys, for both the columnar and equiaxed zones. In addition, the columnar zones of Sn-4. wt.%Zn and Sn-8.9. wt.%Zn specimens are more resistant to corrosion than the equiaxed grain specimens. However, the equiaxed zone of Sn-1. wt.%Zn alloy is less susceptible to corrosion than the columnar zone. After adjustment by equivalent circuits it is revealed that the equiaxed zone of Sn-8.9. wt.%Zn alloy has a second porous layer composed of corrosion products on the electrode surface. © 2016 The Authors. |
| title |
Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions |
| title_short |
Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions |
| title_full |
Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions |
| title_fullStr |
Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions |
| title_full_unstemmed |
Electrochemical behavior of Sn-Zn alloys with different grain structures in chloride-containing solutions |
| title_sort |
electrochemical behavior of sn-zn alloys with different grain structures in chloride-containing solutions |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18785352_v_n_p_Mendez http://hdl.handle.net/20.500.12110/paper_18785352_v_n_p_Mendez |
| _version_ |
1768543345571790848 |