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Effect of Localized Corrosion on Fatigue–Crack Growth in 2524-T3 and 2198-T851 Aluminum Alloys Used as Aircraft Materials

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Abstract

Corrosion and fatigue of aluminum alloys are major issues for the in-service life assessment of aircraft structures and for the management of aging air fleets. The aim of this work was to evaluate the effect of localized corrosion on fatigue crack growth (FCG) resistance of the AA2198-T851 Al-Li alloy (Solution Heat Treated, Cold Worked, and Artificially Aged), comparing it with the FCG resistance of AA2524-T3 (Solution Heat Treated and Cold Worked), considering the effect of seawater fog environment. Before fatigue tests, the corrosion behavior of 2198-T851 and 2524-T3 aluminum alloys was verified using open circuit potential and potentiodynamic polarization techniques. Fatigue in air and corrosion fatigue tests were performed applying a stress ratio (R) of 0.1, 15 Hz (air) and 0.1 Hz (seawater fog) frequencies, using a sinusoidal waveform in all cases. The results showed that the localized characteristics of the 2198-T851 and 2524-T3 aluminum alloys are essentially related to the existence of intermetallic compounds, which, due to their different nature, may be cathodic or anodic in relation to the aluminum matrix. The corrosive medium has affected the FCG rate of both aluminum alloys, in a quite similar way.

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Acknowledgments

The authors gratefully acknowledge the Department of Materials Engineering, University of São Paulo—USP for providing the laboratory facilities and the Brazilian research funding agencies CNPq (Processes: 303684/2015-1 and 402142/2016-0) and CAPES (Process: BEX4936/10-8) for their financial support.

The authors would like to express their thanks to Professor Fernando Quites, in memorian, for the contributions made in this work.

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Authors and Affiliations

  1. Institute of Exact Sciences, Naturals and Education, Federal University of Triângulo Mineiro (UFTM), Avenida Doutor Randolfo Borges Júnior, Univerdecidade, Uberaba, Minas Gerais, 38064200, Brazil

    J. A. Moreto

  2. Department of Materials Engineering, University of São Paulo, Av. Trabalhador São-carlense, São Carlos, SP, 13566590, Brazil

    J. A. Moreto & W. W. Bose Filho

  3. Department of Production Engineering, Federal University of Technology of Paraná (UTFPR), Av. Monteiro Lobato s/n Km 04, Ponta Grossa, PR, 84016-210, Brazil

    E. E. Broday

  4. Sorocaba Technological College (FATEC), Av. Engenheiro Carlos Reinaldo Mendes, Alto da Boa Vista, Sorocaba, São Paulo, 18013-280, Brazil

    L. S. Rossino

  5. Federal University of São Carlos - UFSCar, Rodovia João Leme dos Santos Km 110, Bairro do Itinga, 18.052-780, Sorocaba, SP, Brazil

    L. S. Rossino

  6. Department of Chemical Engineering, Instituto Superior Técnico, University of Lisbon, 1049-001, Lisbon, Portugal

    J. C. S. Fernandes

  7. CQE - Centro de Química Estrutural, 1049-001, Lisbon, Portugal

    J. C. S. Fernandes

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  1. J. A. Moreto
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  5. W. W. Bose Filho
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Correspondence to J. A. Moreto.

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Moreto, J.A., Broday, E.E., Rossino, L.S. et al. Effect of Localized Corrosion on Fatigue–Crack Growth in 2524-T3 and 2198-T851 Aluminum Alloys Used as Aircraft Materials. J. of Materi Eng and Perform 27, 1917–1926 (2018). https://doi.org/10.1007/s11665-018-3244-7

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  • DOI: https://doi.org/10.1007/s11665-018-3244-7

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