Influence of exposure in a corrosive environment on ultimate stress of heat-treated welded joints of Al–Mg–Si–Сu alloy
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Lyudmila Nyrkova
,
Larysa Goncharenko
Abstract
The priority task of modern aircraft construction is to ensure the reliability of the operation of structures, which depends both on the quality of execution of technological processes during manufacturing and on the corrosion-mechanical durability of welded joints. This work aims to study the influence of contact duration with a corrosive environment on the mechanical strength of the base metal and welded joints of the Al–Mg–Si–Cu alloy, heat-treated in different modes (artificial aging, quenching followed by artificial aging). Corrosion-mechanical tests were carried out under constant axial tensile stress in 3 % NaCl solution for 14 days, followed by determination of the corrosion rate, ultimate strength, and fractographic analysis of the fracture surface. The results showed that the corrosion resistance of the joints is almost equal to the corrosion resistance of the base metal. It was experimentally confirmed that the ultimate strength of the base metal and welded joints decreased after corrosion exposure in a 3 % NaCl solution. This is caused by the embrittlement of the structure and the formation of corrosion defects in the near-surface zone during contact with a corrosive environment, which led to a change like a fracture from ductile to ductile with brittleness.
Funding source: National Academy of Sciences of Ukraine
Award Identifier / Grant number: 0117U001188
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This work was carried out in E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine with financial support by the National Academy of Sciences of Ukraine in 2017–2021 (State registration number 0117U001188).
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Conflicts of interest: The authors declare no conflicts of interest regarding this article.
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Articles in the same Issue
- Frontmatter
- Reviews
- A comprehensive review on synergistic and individual effects of erosion–corrosion in ferrous piping materials
- Application of machine learning in material corrosion research
- Corrosion inhibition efficiency and quantum chemical studies of some organic compounds: theoretical evaluation
- Original Articles
- In vitro biomedical corrosion and enzyme activity inhibition on modified Cu-Zn-Al bioalloy
- Imidazoline behavior as corrosion inhibitor in the electrochemical characterization of SCC behavior of an API X70 steel exposed to brine solution
- In-situ visualization of hydrogen atom distribution at micro-indentation in a carbon steel by scanning Kelvin probe force microscopy
- Influence of exposure in a corrosive environment on ultimate stress of heat-treated welded joints of Al–Mg–Si–Сu alloy
- Surface preparation and double layer effect for silane application on electrogalvanized steel
