Corrosion Properties of Mn-Based Alloys Obtained by Aluminothermic Reduction of Deep-Sea Nodules
Deep-sea manganese nodules are polymetallic oxidic ores that can be found on a seabed. Aluminothermic reduction is one of the possibilities of manganese nodules processing. This process obtains the polymetallic alloy with a high content of Mn and a varying content of Al, depending on the ratio betwe...
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2021-09-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/18/5211 |
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| author | Šárka Msallamová Pavel Novák Pauline Miossec Jaromír Kopeček Alisa Tsepeleva Darya Rudomilova Jaroslav Fojt |
| author_facet | Šárka Msallamová Pavel Novák Pauline Miossec Jaromír Kopeček Alisa Tsepeleva Darya Rudomilova Jaroslav Fojt |
| author_sort | Šárka Msallamová |
| collection | DOAJ |
| description | Deep-sea manganese nodules are polymetallic oxidic ores that can be found on a seabed. Aluminothermic reduction is one of the possibilities of manganese nodules processing. This process obtains the polymetallic alloy with a high content of Mn and a varying content of Al, depending on the ratio between aluminum and nodules. The corrosion behaviors of three experimental Mn-based alloys produced by aluminothermic reduction with a content of Mn > 50 wt % were studied. The electrochemical testing in potable water and model seawater was used to explain the corrosion mechanism of Mn-based alloys. The results showed that the corrosion rate of experimental Mn-based alloy decreases with the increase in aluminum content in both potable water and model seawater. It was observed that the uniform corrosion of experimental Mn-based alloys is changed with an increase in aluminum content in alloy to localized corrosion, which was caused by microcells in an environment of model seawater. In contrast, the formation of a semi-protective layer of corrosion products was observed on the surface of Mn-based alloys with a higher content of aluminum in potable water. Moreover, the pitting corrosion of tested Mn-based alloys was observed neither in potable water nor in model seawater. |
| first_indexed | 2024-03-10T07:29:21Z |
| format | Article |
| id | doaj.art-ca0ec89e39af45e390c1b31909cff7b5 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T07:29:21Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-ca0ec89e39af45e390c1b31909cff7b52023-11-22T14:00:30ZengMDPI AGMaterials1996-19442021-09-011418521110.3390/ma14185211Corrosion Properties of Mn-Based Alloys Obtained by Aluminothermic Reduction of Deep-Sea NodulesŠárka Msallamová0Pavel Novák1Pauline Miossec2Jaromír Kopeček3Alisa Tsepeleva4Darya Rudomilova5Jaroslav Fojt6Department of Metals and Corrosion Engineering, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech RepublicDepartment of Metals and Corrosion Engineering, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech RepublicDepartment of Metals and Corrosion Engineering, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech RepublicFZU-Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 00 Praha 8, Czech RepublicDepartment of Metals and Corrosion Engineering, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech RepublicTechnopark Kralupy, University of Chemistry and Technology, Prague, G. Karse 7/2, 278 01 Kralupy nad Vltavou, Czech RepublicDepartment of Metals and Corrosion Engineering, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech RepublicDeep-sea manganese nodules are polymetallic oxidic ores that can be found on a seabed. Aluminothermic reduction is one of the possibilities of manganese nodules processing. This process obtains the polymetallic alloy with a high content of Mn and a varying content of Al, depending on the ratio between aluminum and nodules. The corrosion behaviors of three experimental Mn-based alloys produced by aluminothermic reduction with a content of Mn > 50 wt % were studied. The electrochemical testing in potable water and model seawater was used to explain the corrosion mechanism of Mn-based alloys. The results showed that the corrosion rate of experimental Mn-based alloy decreases with the increase in aluminum content in both potable water and model seawater. It was observed that the uniform corrosion of experimental Mn-based alloys is changed with an increase in aluminum content in alloy to localized corrosion, which was caused by microcells in an environment of model seawater. In contrast, the formation of a semi-protective layer of corrosion products was observed on the surface of Mn-based alloys with a higher content of aluminum in potable water. Moreover, the pitting corrosion of tested Mn-based alloys was observed neither in potable water nor in model seawater.https://www.mdpi.com/1996-1944/14/18/5211deep-sea noduleselectrochemical measurementaluminothermic reductionMn–Al alloyintergranular corrosion |
| spellingShingle | Šárka Msallamová Pavel Novák Pauline Miossec Jaromír Kopeček Alisa Tsepeleva Darya Rudomilova Jaroslav Fojt Corrosion Properties of Mn-Based Alloys Obtained by Aluminothermic Reduction of Deep-Sea Nodules Materials deep-sea nodules electrochemical measurement aluminothermic reduction Mn–Al alloy intergranular corrosion |
| title | Corrosion Properties of Mn-Based Alloys Obtained by Aluminothermic Reduction of Deep-Sea Nodules |
| title_full | Corrosion Properties of Mn-Based Alloys Obtained by Aluminothermic Reduction of Deep-Sea Nodules |
| title_fullStr | Corrosion Properties of Mn-Based Alloys Obtained by Aluminothermic Reduction of Deep-Sea Nodules |
| title_full_unstemmed | Corrosion Properties of Mn-Based Alloys Obtained by Aluminothermic Reduction of Deep-Sea Nodules |
| title_short | Corrosion Properties of Mn-Based Alloys Obtained by Aluminothermic Reduction of Deep-Sea Nodules |
| title_sort | corrosion properties of mn based alloys obtained by aluminothermic reduction of deep sea nodules |
| topic | deep-sea nodules electrochemical measurement aluminothermic reduction Mn–Al alloy intergranular corrosion |
| url | https://www.mdpi.com/1996-1944/14/18/5211 |
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