Resistance to Pit Formation and Pit Growth for Different Tempers of AA2024 Aluminium Alloy in Presence of Benzotriazole
| Autor: | Bore Jegdić, Dunja Daničić, Jovanka Kovačina, Maja Stevanovic, Bojana Radojković, Biljana Bobić, Marija Mihailovic |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Alloy 02 engineering and technology engineering.material Corrosion Corrosion inhibitor chemistry.chemical_compound Materials Chemistry Aluminium alloy Pitting corrosion Microstructure Benzotriazole 020502 materials Metallurgy Metals and Alloys Aluminium alloys Condensed Matter Physics Dielectric spectroscopy 0205 materials engineering chemistry Mechanics of Materials visual_art visual_art.visual_art_medium engineering Electrochemical impedance spectroscopy Scanning electron microscopy |
| Zdroj: | Metals and Materials International |
| ISSN: | 2005-4149 1598-9623 |
| DOI: | 10.1007/s12540-019-00451-8 |
| Popis: | The paper analyses the corrosion behaviour of both naturally and artificially aged AA2024 aluminium alloy in NaCl solution in the presence of the corrosion inhibitor benzotriazole (BTA). The differences between these two aging tempers in terms of resistance to general corrosion are explained as well as the differences in terms of pit formation and pit growth. Based on the values of the polarisation resistance and the corrosion current density, the general corrosion resistance of the alloy is determined in the absence and in the presence of BTA. The resistance to pit formation and pit growth is determined on the basis of the polarisation measurements results. Scanning electron microscopy confirmed the expected differences in the appearance and size of the pits formed in naturally aged and artificially aged alloy. In the presence of the corrosion inhibitor BTA, for both aging tempers of the alloy, the corrosion resistance is significantly higher compared to the resistance in the solution without the inhibitor. The value of the polarisation resistance for both aging tempers increases over time. However, at the same time, the value of the constant phase element increases as well. An explanation for this phenomenon is provided. The calculated average value of the thickness of the adsorbed inhibitor layer on the surface of the aluminium alloy is in accordance with the inhibitor protective ability for both aging tempers. Graphic |
| Databáze: | OpenAIRE |
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