Effects of the Combined Addition of Zn and Mg on Corrosion Behaviors of Electropainted AlSi-Based Metallic Coatings Used for Hot-Stamping Steel Sheets
The effects of the combined addition of Zn and Mg on the corrosion resistance of AlSi-based coating for automotive steel sheets were investigated using a variety of analytical and electrochemical techniques. The preferential dissolution of Mg and Zn from MgZn<sub>2</sub>/Mg<sub>2&l...
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doaj-4b79e21cc2254754802692104d142c582020-11-25T03:12:46ZengMDPI AGMaterials1996-19442020-07-01133379337910.3390/ma13153379Effects of the Combined Addition of Zn and Mg on Corrosion Behaviors of Electropainted AlSi-Based Metallic Coatings Used for Hot-Stamping Steel SheetsSi On Kim0Won Seog Yang1Sung Jin Kim2Department of Advanced Materials Engineering, Sunchon National University, Jungang-ro, Suncheon, Jeonnam 57922, KoreaR&D Division, Hyundai Steel, 1480 Bukbusaneop-ro, Songak-eup, Dangjin, Chungnam 31719, KoreaDepartment of Advanced Materials Engineering, Sunchon National University, Jungang-ro, Suncheon, Jeonnam 57922, KoreaThe effects of the combined addition of Zn and Mg on the corrosion resistance of AlSi-based coating for automotive steel sheets were investigated using a variety of analytical and electrochemical techniques. The preferential dissolution of Mg and Zn from MgZn<sub>2</sub>/Mg<sub>2</sub>Si phases occurred on the AlSi-based coating that had been alloyed with a smaller portion of Zn and Mg, which contributed to the rapid surface coverage by corrosion products with a protective nature, reducing the corrosion current density. On the other hand, localized corrosion attacks caused by the selective dissolution of Mg were also observed in the AlSi-based coating with a smaller portion of Zn and Mg. Such alloying can also worsen its corrosion resistance when coated additionally with electrodeposited paint. The mechanistic reasons for these conflicting results are also discussed.https://www.mdpi.com/1996-1944/13/15/3379hot stamping steelAlSi-based coatingelectrodeposited paintZnMgcorrosion |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Si On Kim Won Seog Yang Sung Jin Kim |
spellingShingle |
Si On Kim Won Seog Yang Sung Jin Kim Effects of the Combined Addition of Zn and Mg on Corrosion Behaviors of Electropainted AlSi-Based Metallic Coatings Used for Hot-Stamping Steel Sheets Materials hot stamping steel AlSi-based coating electrodeposited paint Zn Mg corrosion |
author_facet |
Si On Kim Won Seog Yang Sung Jin Kim |
author_sort |
Si On Kim |
title |
Effects of the Combined Addition of Zn and Mg on Corrosion Behaviors of Electropainted AlSi-Based Metallic Coatings Used for Hot-Stamping Steel Sheets |
title_short |
Effects of the Combined Addition of Zn and Mg on Corrosion Behaviors of Electropainted AlSi-Based Metallic Coatings Used for Hot-Stamping Steel Sheets |
title_full |
Effects of the Combined Addition of Zn and Mg on Corrosion Behaviors of Electropainted AlSi-Based Metallic Coatings Used for Hot-Stamping Steel Sheets |
title_fullStr |
Effects of the Combined Addition of Zn and Mg on Corrosion Behaviors of Electropainted AlSi-Based Metallic Coatings Used for Hot-Stamping Steel Sheets |
title_full_unstemmed |
Effects of the Combined Addition of Zn and Mg on Corrosion Behaviors of Electropainted AlSi-Based Metallic Coatings Used for Hot-Stamping Steel Sheets |
title_sort |
effects of the combined addition of zn and mg on corrosion behaviors of electropainted alsi-based metallic coatings used for hot-stamping steel sheets |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2020-07-01 |
description |
The effects of the combined addition of Zn and Mg on the corrosion resistance of AlSi-based coating for automotive steel sheets were investigated using a variety of analytical and electrochemical techniques. The preferential dissolution of Mg and Zn from MgZn<sub>2</sub>/Mg<sub>2</sub>Si phases occurred on the AlSi-based coating that had been alloyed with a smaller portion of Zn and Mg, which contributed to the rapid surface coverage by corrosion products with a protective nature, reducing the corrosion current density. On the other hand, localized corrosion attacks caused by the selective dissolution of Mg were also observed in the AlSi-based coating with a smaller portion of Zn and Mg. Such alloying can also worsen its corrosion resistance when coated additionally with electrodeposited paint. The mechanistic reasons for these conflicting results are also discussed. |
topic |
hot stamping steel AlSi-based coating electrodeposited paint Zn Mg corrosion |
url |
https://www.mdpi.com/1996-1944/13/15/3379 |
work_keys_str_mv |
AT sionkim effectsofthecombinedadditionofznandmgoncorrosionbehaviorsofelectropaintedalsibasedmetalliccoatingsusedforhotstampingsteelsheets AT wonseogyang effectsofthecombinedadditionofznandmgoncorrosionbehaviorsofelectropaintedalsibasedmetalliccoatingsusedforhotstampingsteelsheets AT sungjinkim effectsofthecombinedadditionofznandmgoncorrosionbehaviorsofelectropaintedalsibasedmetalliccoatingsusedforhotstampingsteelsheets |
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