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The Role of Zinc Phosphate Pigment in the Anticorrosion Properties of Bisphenol A Diglycidyl Ether-Polyaminoamide Coating for Aluminum Alloy AA2024-T3

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Abstract

This study is focused on an anticorrosive formulation as a coating an aluminum alloy AA2024-T3 to withstand marine environment. The anticorrosive formulation was based on an epoxy resin bisphenol-A diglycidyl ether that is cured with polyamine polyaminoamide. The anticorrosive formulation was applied onto samples of AA 2024-T3 surface with zinc phosphate (ER-ZP) and without zinc phosphate (standard). Zinc phosphate was added to the formulation in about 5 wt%. The coated AA2024-T3 substrates were evaluated by exposing them to a salt spray test chamber for various periods of time. The anticorrosive performances of the two epoxy coatings, the standard (ER) and the one containing ZP (ER-ZP), were evaluated by electrochemical impedance spectroscopy (EIS). The surface morphology of the two coatings was characterized by a scanning electron microscopy and optical microscopy. The two coated AA2024 T3 samples were tested in a harsh environment of electrolyte solution to simulate the marine environment (3 wt% NaCl solution). The value of the impedance (|Z|0.01 Hz) obtained by the EIS method for the standard epoxy coating (ER) and epoxy coating containing ZP (ER-ZP) were 0.88 MΩ cm2 and 6.92 MΩ cm2 during the 2 h of immersion in 3 wt% NaCl, respectively. After exposure for a long period of time in salt spray test chamber (4392 h) and 2 h of immersion in 3 wt% NaCl the values were dropped to 0.27 MΩ cm2 and 0.83 MΩ cm2, respectively. Under these conditions, a very high impedance value was obtained for AA2024-T3 samples coated with an epoxy coating containing ZP (ER-ZP). The results showed that, the ER-ZP coating surface applied on AA2024-T3 samples exposed for 4392 h showed that, the coating is homogeneous and well adhered to aluminum alloy 2024-T3 surface. The results indicated that, ZP played a dual role, it enhanced the adhesion properties of the ER coating and the coating performance as an effective barrier.

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Acknowledgements

We would like to thank the laboratory of metallurgical analysis, Cetim Maroc Développement and quality control laboratory, Casablanca Aeronautics Group Figeac Aero. Aeronautical Technopole of Nouaceur, Mohammed V-Casablanca Airport, Morocco.

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Authors and Affiliations

  1. Laboratory of Agroresources, Polymers and Process Engineering (LAPPE), Department of Chemistry, Faculty of Science, Ibn Tofail University, BP 133, 14000, Kenitra, Morocco

    O. Dagdag & A. El Harfi

  2. Laboratory of Optoelectronics, Physical Chemistry of Materials and Environment, Department of Physics, Faculty of Science, Ibn Tofail University, BP 133, 14000, Kenitra, Morocco

    L. El Gana

  3. Laboratoire de Recherche en Science des Matériaux des Milieux et de la Modélisation, Université Hassan 1er, 25000, Khouribga, Morocco

    Z. Hlimi

  4. Laboratory of Metallurgical Analysis, Cetim Maroc Développement, Technopole aéronautique de Nouasser, Aéroport Mohammed V, 20000, Casablanca - Nouasser, Morocco

    Z. Hlimi

  5. Laboratory of Materials, Electrochemistry and Environment, Department of Chemistry, Faculty of Sciences, Ibn Tofail University, Kenitra, Morocco

    H. Erramli

  6. Department of Chemistry, An-Najah National University, P. O. Box 7, Nablus, Palestine

    O. Hamed & S. Jodeh

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  1. O. Dagdag
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  2. A. El Harfi
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Correspondence to O. Dagdag or O. Hamed.

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Dagdag, O., El Harfi, A., El Gana, L. et al. The Role of Zinc Phosphate Pigment in the Anticorrosion Properties of Bisphenol A Diglycidyl Ether-Polyaminoamide Coating for Aluminum Alloy AA2024-T3. J Bio Tribo Corros 5, 7 (2019). https://doi.org/10.1007/s40735-018-0200-x

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  • DOI: https://doi.org/10.1007/s40735-018-0200-x

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