The influence of iron level on corrosion of high-pressure die-cast LM24 alloy.
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| Title: | The influence of iron level on corrosion of high-pressure die-cast LM24 alloy. |
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| Authors: | Rahimi, Ehsan1 ehsan.rahimi.dme@gmail.com, Thompson, George E.1, Scamans, Geoff M.2, Fan, Z.2 |
| Source: | Metallurgical Research & Technology. 2016, Vol. 113 Issue 6, p1-20. 20p. |
| Subjects: | Aluminum alloys, Corrosion & anti-corrosives, Detrimental reliance, Die castings, Aluminum castings, Iron alloys, Kelvin probe force microscopy |
| Abstract: | Iron is a detrimental alloying element for aluminium alloys; however, it is essential for facilitating die ejection in high-pressure die-casting process. Hence, studying the effect of iron on the corrosion performance of HPDC aluminium alloys is useful to find an optimal iron content for a specific alloy. Four LM24 alloys with 0.6 wt.% Fe, 0.8 wt.% Fe, 1.2 wt.% Fe and 2 wt.% Fe additions have been examined in this study. In addition to the differences in iron levels, the copper and manganese contents varied in two alloys. The corrosion performance of the alloy specimens was evaluated by electrochemical noise and electrochemical polarisation measurements, and scanning Kelvin probe force microscopy. The microstructures of the individual alloy specimens were observed by scanning electron microscopy prior to and after each corrosion evaluation experiment. The results show that more corrosion products accumulated in the alloys with higher iron additions, and this led to reduction of cathodic reaction rates in the aqueous aggressive chloride solution. An increased Mn/Fe ratio causes the distribution of iron-rich phase particles and cathodic sites across the surface of the alloy. Hence, the compositional potential gradient of the phases throughout the surface decreases. In addition, the potential gradient of the phases also depends on the surface roughness of the phase particles; therefore, the alloys with the larger iron-rich phase particles show the highest potential gradients. [ABSTRACT FROM AUTHOR] |
| Copyright of Metallurgical Research & Technology is the property of EDP Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 117841040 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: The influence of iron level on corrosion of high-pressure die-cast LM24 alloy. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Rahimi%2C+Ehsan%22">Rahimi, Ehsan</searchLink><relatesTo>1</relatesTo><i> ehsan.rahimi.dme@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Thompson%2C+George+E%2E%22">Thompson, George E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Scamans%2C+Geoff+M%2E%22">Scamans, Geoff M.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Fan%2C+Z%2E%22">Fan, Z.</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Metallurgical+Research+%26+Technology%22">Metallurgical Research & Technology</searchLink>. 2016, Vol. 113 Issue 6, p1-20. 20p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Aluminum+alloys%22">Aluminum alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Corrosion+%26+anti-corrosives%22">Corrosion & anti-corrosives</searchLink><br /><searchLink fieldCode="DE" term="%22Detrimental+reliance%22">Detrimental reliance</searchLink><br /><searchLink fieldCode="DE" term="%22Die+castings%22">Die castings</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum+castings%22">Aluminum castings</searchLink><br /><searchLink fieldCode="DE" term="%22Iron+alloys%22">Iron alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Kelvin+probe+force+microscopy%22">Kelvin probe force microscopy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Iron is a detrimental alloying element for aluminium alloys; however, it is essential for facilitating die ejection in high-pressure die-casting process. Hence, studying the effect of iron on the corrosion performance of HPDC aluminium alloys is useful to find an optimal iron content for a specific alloy. Four LM24 alloys with 0.6 wt.% Fe, 0.8 wt.% Fe, 1.2 wt.% Fe and 2 wt.% Fe additions have been examined in this study. In addition to the differences in iron levels, the copper and manganese contents varied in two alloys. The corrosion performance of the alloy specimens was evaluated by electrochemical noise and electrochemical polarisation measurements, and scanning Kelvin probe force microscopy. The microstructures of the individual alloy specimens were observed by scanning electron microscopy prior to and after each corrosion evaluation experiment. The results show that more corrosion products accumulated in the alloys with higher iron additions, and this led to reduction of cathodic reaction rates in the aqueous aggressive chloride solution. An increased Mn/Fe ratio causes the distribution of iron-rich phase particles and cathodic sites across the surface of the alloy. Hence, the compositional potential gradient of the phases throughout the surface decreases. In addition, the potential gradient of the phases also depends on the surface roughness of the phase particles; therefore, the alloys with the larger iron-rich phase particles show the highest potential gradients. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Metallurgical Research & Technology is the property of EDP Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1051/metal/2016036 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 20 StartPage: 1 Subjects: – SubjectFull: Aluminum alloys Type: general – SubjectFull: Corrosion & anti-corrosives Type: general – SubjectFull: Detrimental reliance Type: general – SubjectFull: Die castings Type: general – SubjectFull: Aluminum castings Type: general – SubjectFull: Iron alloys Type: general – SubjectFull: Kelvin probe force microscopy Type: general Titles: – TitleFull: The influence of iron level on corrosion of high-pressure die-cast LM24 alloy. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Rahimi, Ehsan – PersonEntity: Name: NameFull: Thompson, George E. – PersonEntity: Name: NameFull: Scamans, Geoff M. – PersonEntity: Name: NameFull: Fan, Z. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: 2016 Type: published Y: 2016 Identifiers: – Type: issn-print Value: 22713646 Numbering: – Type: volume Value: 113 – Type: issue Value: 6 Titles: – TitleFull: Metallurgical Research & Technology Type: main |
| ResultId | 1 |
