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Corrosion-Fatigue Performance of Hard Anodized and MAO-Coated 2024-T3 and 7075-T6 Aerospace Al Alloys

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Abstract

In the present study, micro-arc oxidation (MAO) coatings were deposited on shot peened high-strength aerospace aluminium alloys namely 2024-T3 and 7075-T6. The comparative corrosion-fatigue performance was evaluated in 3.5 wt.% NaCl corrosion environment for bare, hard anodized and SP + MAO (prior shot-peened and MAO) coated Al alloys. Also, the corrosion behavior of bare and SP + MAO coated Al alloys was assessed through potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) tests. In addition, SP + MAO coatings were characterized for the phase composition, surface/cross-sectional morphologies and surface roughness. Furthermore, the corrosion-fatigue fractured features of coatings were examined to understand the failure mechanisms. The SP + MAO coatings deposited on Al alloys possess superior corrosion-fatigue life as compared to the bare and hard anodized conditions.

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Acknowledgements

Authors sincerely thank Mrs. A. Jyothirmayi for her help in conducting the corrosion experiments.

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Authors and Affiliations

  1. Centre for Engineered Coatings, International Advanced Research Center for Powder Metallurgy and New Materials (ARCI), Hyderabad, India

    Madhavi Y., Rama Krishna L. & Narasaiah N.

  2. Metallurgical and Materials Engineering, National Institute of Technology (NIT), Warangal, India

    Madhavi Y.

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  1. Madhavi Y.
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Madhavi, Y., Rama Krishna, L. & Narasaiah, N. Corrosion-Fatigue Performance of Hard Anodized and MAO-Coated 2024-T3 and 7075-T6 Aerospace Al Alloys. Trans Indian Inst Met 74, 2231–2243 (2021). https://doi.org/10.1007/s12666-021-02313-7

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