Influence of heat treatment on corrosion resistance of Mg-Al-Zn alloy processed by severe plastic deformation
The effect of subsequent annealing on the electrochemical properties of an AZ31 magnesium alloy processed by extrusion and equal channel angular pressing (ECAP) was investigated. The electrochemical properties were evaluated using potentiodynamic tests in corrosion solution of 0.1 M sodium chloride....
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2018-11-01
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Online Access: | https://doi.org/10.1515/eng-2018-0044 |
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doaj-164eef8d914948e08dc3c0184a951f652021-09-05T20:44:49ZengDe GruyterOpen Engineering2391-54392018-11-018139139410.1515/eng-2018-0044eng-2018-0044Influence of heat treatment on corrosion resistance of Mg-Al-Zn alloy processed by severe plastic deformationZemková Mária0Král Róbert1Čížek Jakub2Šmilauerová Jana3Minárik Peter4Charles University Prague, PragueCzech RepublicCharles University Prague, PragueCzech RepublicCharles University Prague, PragueCzech RepublicCharles University Prague, PragueCzech RepublicCharles University Prague, PragueCzech RepublicThe effect of subsequent annealing on the electrochemical properties of an AZ31 magnesium alloy processed by extrusion and equal channel angular pressing (ECAP) was investigated. The electrochemical properties were evaluated using potentiodynamic tests in corrosion solution of 0.1 M sodium chloride. The electrochemical changes after annealing were correlated with microstructure evolution. The microstructure was analyzed by scanning electron microscope (SEM) and electron backscatter diffraction (EBSD). The evolution of dislocation density was determined by positron annihilation spectroscopy (PAS). The annealing for 1h at temperatures ranging from 150∘C to 250∘C resulted in higher polarization resistance in all cases. The polarization resistance of sample annealed at 250∘C was ~17% higher compared to just ECAPed material. Combination of gradual decrease of dislocation density, grain growth and second phase particles dissolution played the crucial role in the corrosion resistance improvement.https://doi.org/10.1515/eng-2018-0044magnesium alloysevere plastic deformationheat treatmentcorrosion resistance |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zemková Mária Král Róbert Čížek Jakub Šmilauerová Jana Minárik Peter |
spellingShingle |
Zemková Mária Král Róbert Čížek Jakub Šmilauerová Jana Minárik Peter Influence of heat treatment on corrosion resistance of Mg-Al-Zn alloy processed by severe plastic deformation Open Engineering magnesium alloy severe plastic deformation heat treatment corrosion resistance |
author_facet |
Zemková Mária Král Róbert Čížek Jakub Šmilauerová Jana Minárik Peter |
author_sort |
Zemková Mária |
title |
Influence of heat treatment on corrosion resistance of Mg-Al-Zn alloy processed by severe plastic deformation |
title_short |
Influence of heat treatment on corrosion resistance of Mg-Al-Zn alloy processed by severe plastic deformation |
title_full |
Influence of heat treatment on corrosion resistance of Mg-Al-Zn alloy processed by severe plastic deformation |
title_fullStr |
Influence of heat treatment on corrosion resistance of Mg-Al-Zn alloy processed by severe plastic deformation |
title_full_unstemmed |
Influence of heat treatment on corrosion resistance of Mg-Al-Zn alloy processed by severe plastic deformation |
title_sort |
influence of heat treatment on corrosion resistance of mg-al-zn alloy processed by severe plastic deformation |
publisher |
De Gruyter |
series |
Open Engineering |
issn |
2391-5439 |
publishDate |
2018-11-01 |
description |
The effect of subsequent annealing on the electrochemical properties of an AZ31 magnesium alloy processed by extrusion and equal channel angular pressing (ECAP) was investigated. The electrochemical properties were evaluated using potentiodynamic tests in corrosion solution of 0.1 M sodium chloride. The electrochemical changes after annealing were correlated with microstructure evolution. The microstructure was analyzed by scanning electron microscope (SEM) and electron backscatter diffraction (EBSD). The evolution of dislocation density was determined by positron annihilation spectroscopy (PAS). The annealing for 1h at temperatures ranging from 150∘C to 250∘C resulted in higher polarization resistance in all cases. The polarization resistance of sample annealed at 250∘C was ~17% higher compared to just ECAPed material. Combination of gradual decrease of dislocation density, grain growth and second phase particles dissolution played the crucial role in the corrosion resistance improvement. |
topic |
magnesium alloy severe plastic deformation heat treatment corrosion resistance |
url |
https://doi.org/10.1515/eng-2018-0044 |
work_keys_str_mv |
AT zemkovamaria influenceofheattreatmentoncorrosionresistanceofmgalznalloyprocessedbysevereplasticdeformation AT kralrobert influenceofheattreatmentoncorrosionresistanceofmgalznalloyprocessedbysevereplasticdeformation AT cizekjakub influenceofheattreatmentoncorrosionresistanceofmgalznalloyprocessedbysevereplasticdeformation AT smilauerovajana influenceofheattreatmentoncorrosionresistanceofmgalznalloyprocessedbysevereplasticdeformation AT minarikpeter influenceofheattreatmentoncorrosionresistanceofmgalznalloyprocessedbysevereplasticdeformation |
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1717785038231175168 |