Effect of Cr Content on Corrosion Resistance of Low-Cr Alloy Steels Studied by Surface and Electrochemical Techniques
The electrochemical behavior of low alloyed Fe-Cr steels with 3 and 5% wt. of Cr in neutral Na<sub>2</sub>SO<sub>4</sub> electrolyte combined with a detailed chemical and morphological characterization of these alloys performed by Auger electron spectroscopy, X-ray photoelect...
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MDPI AG
2021-10-01
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| Series: | Electrochem |
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| Online Access: | https://www.mdpi.com/2673-3293/2/4/35 |
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| author | Alicja Łukaszczyk Jacek Banaś Marcin Pisarek Antoine Seyeux Philippe Marcus Jolanta Światowska |
| author_facet | Alicja Łukaszczyk Jacek Banaś Marcin Pisarek Antoine Seyeux Philippe Marcus Jolanta Światowska |
| author_sort | Alicja Łukaszczyk |
| collection | DOAJ |
| description | The electrochemical behavior of low alloyed Fe-Cr steels with 3 and 5% wt. of Cr in neutral Na<sub>2</sub>SO<sub>4</sub> electrolyte combined with a detailed chemical and morphological characterization of these alloys performed by Auger electron spectroscopy, X-ray photoelectron spectroscopy, time-of-flight secondary ion mass spectrometry and scanning electron microscopy are presented here. The corrosion of low alloyed Fe-Cr steels proceeds in the prepassive range, with the formation of corrosion surface films having a duplex structure with outer iron oxide/hydroxide layer and inner Cr oxide-rich layer. The thickness, composition, and the morphology of the surface films vary as a function of chromium content in the alloy as well as conditions of electrochemical tests (temperature). Even a low chromium content shows a beneficial effect on the corrosion performances of the Fe-Cr steels. The chromium as a more active component than iron of ferrite increases the anodic activity of this phase, which results in a rapid saturation of the surface with the anodic reaction products forming a fine crystalline-like and compact layer of corrosion products. In this way, the chromium acts as a modifier of formation/crystallization of the iron-rich surface film (mainly magnetite) in the prepassive range. |
| first_indexed | 2024-03-10T04:16:20Z |
| format | Article |
| id | doaj.art-bfb7c7ff347e4b899c76470508f428af |
| institution | Directory Open Access Journal |
| issn | 2673-3293 |
| language | English |
| last_indexed | 2024-03-10T04:16:20Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electrochem |
| spelling | doaj.art-bfb7c7ff347e4b899c76470508f428af2023-11-23T08:01:09ZengMDPI AGElectrochem2673-32932021-10-012454656210.3390/electrochem2040035Effect of Cr Content on Corrosion Resistance of Low-Cr Alloy Steels Studied by Surface and Electrochemical TechniquesAlicja Łukaszczyk0Jacek Banaś1Marcin Pisarek2Antoine Seyeux3Philippe Marcus4Jolanta Światowska5Department of Chemistry and Corrosion of Metals, Faculty of Foundry Engineering, AGH University of Science and Technology, Reymonta 23, 30-059 Krakow, PolandDepartment of Chemistry and Corrosion of Metals, Faculty of Foundry Engineering, AGH University of Science and Technology, Reymonta 23, 30-059 Krakow, PolandInstitute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, PolandInstitut de Recherche de Chimie Paris, Chimie ParisTech—CNRS, PSL Research University, 11 rue Pierre et Marie Curie, 75005 Paris, FranceInstitut de Recherche de Chimie Paris, Chimie ParisTech—CNRS, PSL Research University, 11 rue Pierre et Marie Curie, 75005 Paris, FranceInstitut de Recherche de Chimie Paris, Chimie ParisTech—CNRS, PSL Research University, 11 rue Pierre et Marie Curie, 75005 Paris, FranceThe electrochemical behavior of low alloyed Fe-Cr steels with 3 and 5% wt. of Cr in neutral Na<sub>2</sub>SO<sub>4</sub> electrolyte combined with a detailed chemical and morphological characterization of these alloys performed by Auger electron spectroscopy, X-ray photoelectron spectroscopy, time-of-flight secondary ion mass spectrometry and scanning electron microscopy are presented here. The corrosion of low alloyed Fe-Cr steels proceeds in the prepassive range, with the formation of corrosion surface films having a duplex structure with outer iron oxide/hydroxide layer and inner Cr oxide-rich layer. The thickness, composition, and the morphology of the surface films vary as a function of chromium content in the alloy as well as conditions of electrochemical tests (temperature). Even a low chromium content shows a beneficial effect on the corrosion performances of the Fe-Cr steels. The chromium as a more active component than iron of ferrite increases the anodic activity of this phase, which results in a rapid saturation of the surface with the anodic reaction products forming a fine crystalline-like and compact layer of corrosion products. In this way, the chromium acts as a modifier of formation/crystallization of the iron-rich surface film (mainly magnetite) in the prepassive range.https://www.mdpi.com/2673-3293/2/4/35iron-chromium alloylow Cr-alloy steeloxide layerXPSToF-SIMSpassivation |
| spellingShingle | Alicja Łukaszczyk Jacek Banaś Marcin Pisarek Antoine Seyeux Philippe Marcus Jolanta Światowska Effect of Cr Content on Corrosion Resistance of Low-Cr Alloy Steels Studied by Surface and Electrochemical Techniques Electrochem iron-chromium alloy low Cr-alloy steel oxide layer XPS ToF-SIMS passivation |
| title | Effect of Cr Content on Corrosion Resistance of Low-Cr Alloy Steels Studied by Surface and Electrochemical Techniques |
| title_full | Effect of Cr Content on Corrosion Resistance of Low-Cr Alloy Steels Studied by Surface and Electrochemical Techniques |
| title_fullStr | Effect of Cr Content on Corrosion Resistance of Low-Cr Alloy Steels Studied by Surface and Electrochemical Techniques |
| title_full_unstemmed | Effect of Cr Content on Corrosion Resistance of Low-Cr Alloy Steels Studied by Surface and Electrochemical Techniques |
| title_short | Effect of Cr Content on Corrosion Resistance of Low-Cr Alloy Steels Studied by Surface and Electrochemical Techniques |
| title_sort | effect of cr content on corrosion resistance of low cr alloy steels studied by surface and electrochemical techniques |
| topic | iron-chromium alloy low Cr-alloy steel oxide layer XPS ToF-SIMS passivation |
| url | https://www.mdpi.com/2673-3293/2/4/35 |
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