MULTICOMPONENT Al-BRONZE COATINGS THERMALLY SPRAYED ONTO TIN BRONZE SUBSTRATE: MICROSTRUCTURAL, MECHANICAL AND CORROSION CHARACTERIZATION IN A 3.5% NaCl SOLUTION

T. Mana (), A. Ati (), B. Zaid and N. Souami ()
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T. Mana: Department of Mechanical Engineering, Laboratory of Materials Technology and Process Engineering, Faculty of Technology, University of Bejaia, 06000 Bejaia, Algeria
A. Ati: Department of Mechanical Engineering, Laboratory of Materials Technology and Process Engineering, Faculty of Technology, University of Bejaia, 06000 Bejaia, Algeria
B. Zaid: #x2020;Department of Metallurgy, Nuclear Research Center of Draria, BP 43 Seballa, Draria, 16000 Alger, Algeria
N. Souami: #x2021;Department of Spectrometry, Nuclear Research Center of Algiers, 2Bd Frantz Algeria

Surface Review and Letters (SRL), 2020, vol. 27, issue 04, 1-10

Abstract: In this work, multicomponent Al-bronze alloys coated Tin-Bronze substrates, fabricated by thermal flame spraying, are characterized by X-ray diffraction and scanning electron microscopy coupled with energy dispersive spectroscopy. Mechanical characterizations are also presented: microhardness measurement and friction coefficient. The electrochemical behavior of tin-bronze samples uncoated and coated with multicomponent Al-Bronze coatings is studied in NaCl 3.5% solutions using potentiodynamic polarization curves and polarization resistance measurements. The microstructure of the coatings has a lamellar morphology. Each lamella is constituted of a mixture of Cu3Al globular micro precipitates (β-phase) uniformly distributed over the solid solution matrix (α-Cu). An oxide based on Cu, Al and Fe is also present in very low concentration. β-phase is unexpected because it is present only above 570∘C in the Cu-Al phase diagram. Compared with the tin-bronze substrate, multicomponent Al-bronze coatings show a friction coefficient three times lower and have a better electrochemical behavior in 3.5% NaCl solution.

Keywords: Multicomponent Al-bronze coatings; thermal flame spray; microstructure; friction coefficient; corrosion (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19501403

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