Trends in Longer-Term Corrosion Loss of Magnesium Alloys
The corrosion of magnesium alloys is often considered to differ in behaviour and development with time from most other metals and alloys because they show evolution of hydrogen right from first exposure. However, data extracted from the open literature indicate that magnesium alloys develop corrosio...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-02-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/14/2/172 |
| _version_ | 1797298511648129024 |
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| author | Robert E. Melchers |
| author_facet | Robert E. Melchers |
| author_sort | Robert E. Melchers |
| collection | DOAJ |
| description | The corrosion of magnesium alloys is often considered to differ in behaviour and development with time from most other metals and alloys because they show evolution of hydrogen right from first exposure. However, data extracted from the open literature indicate that magnesium alloys develop corrosion mass-loss trends with time that are consistent with the so-called bimodal pattern, which is topologically similar to those of other alloys. Examples are given of such trending for magnesium alloys under immersion, half-tide and various atmospheric exposure conditions. The critical roles of corrosion pitting and its development into localised corrosion are discussed. For high-purity magnesium alloys, the transition to longer-term corrosion, which is rate-controlled by the hydrogen evolution cathodic reaction, occurs quickly, within days. Comments are made about the application of measurements of hydrogen evolution and of electrochemical methods to make rapid estimates of shorter-term corrosion rates. |
| first_indexed | 2024-03-07T22:36:53Z |
| format | Article |
| id | doaj.art-c7dae88fcbe74751907f2b7059601076 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-07T22:36:53Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-c7dae88fcbe74751907f2b70596010762024-02-23T15:13:16ZengMDPI AGCrystals2073-43522024-02-0114217210.3390/cryst14020172Trends in Longer-Term Corrosion Loss of Magnesium AlloysRobert E. Melchers0Centre for Infrastructure Performance and Reliability, The University of Newcastle, Newcastle, NSW 2308, AustraliaThe corrosion of magnesium alloys is often considered to differ in behaviour and development with time from most other metals and alloys because they show evolution of hydrogen right from first exposure. However, data extracted from the open literature indicate that magnesium alloys develop corrosion mass-loss trends with time that are consistent with the so-called bimodal pattern, which is topologically similar to those of other alloys. Examples are given of such trending for magnesium alloys under immersion, half-tide and various atmospheric exposure conditions. The critical roles of corrosion pitting and its development into localised corrosion are discussed. For high-purity magnesium alloys, the transition to longer-term corrosion, which is rate-controlled by the hydrogen evolution cathodic reaction, occurs quickly, within days. Comments are made about the application of measurements of hydrogen evolution and of electrochemical methods to make rapid estimates of shorter-term corrosion rates.https://www.mdpi.com/2073-4352/14/2/172magnesiumcorrosionpittingbimodalhydrogen evolution |
| spellingShingle | Robert E. Melchers Trends in Longer-Term Corrosion Loss of Magnesium Alloys Crystals magnesium corrosion pitting bimodal hydrogen evolution |
| title | Trends in Longer-Term Corrosion Loss of Magnesium Alloys |
| title_full | Trends in Longer-Term Corrosion Loss of Magnesium Alloys |
| title_fullStr | Trends in Longer-Term Corrosion Loss of Magnesium Alloys |
| title_full_unstemmed | Trends in Longer-Term Corrosion Loss of Magnesium Alloys |
| title_short | Trends in Longer-Term Corrosion Loss of Magnesium Alloys |
| title_sort | trends in longer term corrosion loss of magnesium alloys |
| topic | magnesium corrosion pitting bimodal hydrogen evolution |
| url | https://www.mdpi.com/2073-4352/14/2/172 |
| work_keys_str_mv | AT robertemelchers trendsinlongertermcorrosionlossofmagnesiumalloys |