Effect of Air Storage on Stress Corrosion Cracking of ZK60 Alloy Induced by Preliminary Immersion in NaCl-Based Corrosion Solution
The preliminary exposure of Mg alloys to corrosion solutions can cause their embrittlement. The phenomenon is referred to as pre-exposure stress corrosion cracking (PESCC). It has been reported that relatively long storage in air after pre-exposure to the corrosion solution is capable of eliminating...
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MDPI AG
2022-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/21/7862 |
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| author | Evgeniy Merson Vitaliy Poluyanov Pavel Myagkikh Dmitri Merson Alexei Vinogradov |
| author_facet | Evgeniy Merson Vitaliy Poluyanov Pavel Myagkikh Dmitri Merson Alexei Vinogradov |
| author_sort | Evgeniy Merson |
| collection | DOAJ |
| description | The preliminary exposure of Mg alloys to corrosion solutions can cause their embrittlement. The phenomenon is referred to as pre-exposure stress corrosion cracking (PESCC). It has been reported that relatively long storage in air after pre-exposure to the corrosion solution is capable of eliminating PESCC. This effect was attributed to the egress of diffusible hydrogen that accumulated in the metal during pre-exposure. However, recent findings challenged this viewpoint and suggested that the corrosion solution retained within the side surface layer of corrosion products could be responsible for PESCC. The present study is aimed at the clarification of the role of hydrogen and the corrosion solution sealed within the corrosion products in the “healing” effect caused by post-exposure storage in air. Using the slow strain rate tensile (SSRT) testing in air and detailed fractographic analysis of the ZK60 specimens subjected to the liquid corrosion followed by storage in air, we found that PESCC was gradually reduced and finally suppressed with the increasing time and temperature of air storage. The complete elimination of PESCC accompanied by recovery of elongation to failure from 20% to 38% was achieved after 24 h of air storage at 150–200 °C. It is established that the characteristic PESCC zone on the fracture surface is composed of two regions, of which the first is always covered by the crust of corrosion products, whereas the second one is free of corrosion products and is characterised by quasi-brittle morphology. It is argued that the corrosion solution and hydrogen stored within the corrosion product layer are responsible for the formation of these two zones, respectively. |
| first_indexed | 2024-03-09T18:52:59Z |
| format | Article |
| id | doaj.art-818b681d76e444158fa45aac1faa3cfc |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T18:52:59Z |
| publishDate | 2022-11-01 |
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| series | Materials |
| spelling | doaj.art-818b681d76e444158fa45aac1faa3cfc2023-11-24T05:42:04ZengMDPI AGMaterials1996-19442022-11-011521786210.3390/ma15217862Effect of Air Storage on Stress Corrosion Cracking of ZK60 Alloy Induced by Preliminary Immersion in NaCl-Based Corrosion SolutionEvgeniy Merson0Vitaliy Poluyanov1Pavel Myagkikh2Dmitri Merson3Alexei Vinogradov4Institute of Advanced Technologies, Togliatti State University, 445020 Togliatti, RussiaInstitute of Advanced Technologies, Togliatti State University, 445020 Togliatti, RussiaInstitute of Advanced Technologies, Togliatti State University, 445020 Togliatti, RussiaInstitute of Advanced Technologies, Togliatti State University, 445020 Togliatti, RussiaDepartment of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, 4791 Trondheim, NorwayThe preliminary exposure of Mg alloys to corrosion solutions can cause their embrittlement. The phenomenon is referred to as pre-exposure stress corrosion cracking (PESCC). It has been reported that relatively long storage in air after pre-exposure to the corrosion solution is capable of eliminating PESCC. This effect was attributed to the egress of diffusible hydrogen that accumulated in the metal during pre-exposure. However, recent findings challenged this viewpoint and suggested that the corrosion solution retained within the side surface layer of corrosion products could be responsible for PESCC. The present study is aimed at the clarification of the role of hydrogen and the corrosion solution sealed within the corrosion products in the “healing” effect caused by post-exposure storage in air. Using the slow strain rate tensile (SSRT) testing in air and detailed fractographic analysis of the ZK60 specimens subjected to the liquid corrosion followed by storage in air, we found that PESCC was gradually reduced and finally suppressed with the increasing time and temperature of air storage. The complete elimination of PESCC accompanied by recovery of elongation to failure from 20% to 38% was achieved after 24 h of air storage at 150–200 °C. It is established that the characteristic PESCC zone on the fracture surface is composed of two regions, of which the first is always covered by the crust of corrosion products, whereas the second one is free of corrosion products and is characterised by quasi-brittle morphology. It is argued that the corrosion solution and hydrogen stored within the corrosion product layer are responsible for the formation of these two zones, respectively.https://www.mdpi.com/1996-1944/15/21/7862air storagecorrosion productsfractographyMg alloyspre-exposurestress corrosion cracking |
| spellingShingle | Evgeniy Merson Vitaliy Poluyanov Pavel Myagkikh Dmitri Merson Alexei Vinogradov Effect of Air Storage on Stress Corrosion Cracking of ZK60 Alloy Induced by Preliminary Immersion in NaCl-Based Corrosion Solution Materials air storage corrosion products fractography Mg alloys pre-exposure stress corrosion cracking |
| title | Effect of Air Storage on Stress Corrosion Cracking of ZK60 Alloy Induced by Preliminary Immersion in NaCl-Based Corrosion Solution |
| title_full | Effect of Air Storage on Stress Corrosion Cracking of ZK60 Alloy Induced by Preliminary Immersion in NaCl-Based Corrosion Solution |
| title_fullStr | Effect of Air Storage on Stress Corrosion Cracking of ZK60 Alloy Induced by Preliminary Immersion in NaCl-Based Corrosion Solution |
| title_full_unstemmed | Effect of Air Storage on Stress Corrosion Cracking of ZK60 Alloy Induced by Preliminary Immersion in NaCl-Based Corrosion Solution |
| title_short | Effect of Air Storage on Stress Corrosion Cracking of ZK60 Alloy Induced by Preliminary Immersion in NaCl-Based Corrosion Solution |
| title_sort | effect of air storage on stress corrosion cracking of zk60 alloy induced by preliminary immersion in nacl based corrosion solution |
| topic | air storage corrosion products fractography Mg alloys pre-exposure stress corrosion cracking |
| url | https://www.mdpi.com/1996-1944/15/21/7862 |
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