New green advanced biopolymer as a repairer of aged AA-5083 alloy immersed into dead seawater
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ORIGINAL PAPER
New green advanced biopolymer as a repairer of aged AA‑5083 alloy immersed into dead seawater Wafa Sassi1 · Rafii Zrelli2 · Jean‑Yves Hihn3 · Patrice Berçot3 · El‑Mustafa Rezrazi3 Received: 7 July 2020 / Accepted: 18 September 2020 © The Polymer Society, Taipei 2020
Abstract Certainly, inhibitors are widely used to reduce corrosion rates of materials in many corrosive environments. However, when the substrate suffers from aggressive corrosion, inhibition still neither efficient nor cost-effective for the substrate performance. In this study, we test a new green biopolymer (diazonium grafted biosurfactant, noted R11) as a repairer of damage that happens to a 3-years-old AA-5083 bar immersed into Dead Seawater. Mechanism reparation has been detailed. Electrochemical techniques, X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM), were used to study, analyze and confirm the effect of reparation of AA-5083 alloy using the R11 compound. The reparation efficiency reached 96%. Keywords Surfactant · Biopolymer · Organic inhibitor · XPS
Introduction Aluminum (Al) is a widely used material in different industries like aeronautics, constructions and nanotechnologies [1–3]. Aluminum materials are preferred for their excellent malleability, corrosion resistance and lightweight. The excellent corrosion resistance of the aluminum over a wide range of pH is due to the formation of a natural passive film onto its extreme surface when contacting aggressive electrolytes [4]. Many researchers proposed that aluminum formed a passive film into chloride media [5–7]. Nowadays, pure aluminum does not match the industry’s needs. Therefore, a wide range of Al-based alloys is used to keep its properties and enhance its performance. The most popular aluminum
* Wafa Sassi [email protected]‑gabes.tn 1
Unité de Recherche Electrochimie, Matériaux Et Environnement UREME (UR17ES45), Faculté Des Sciences de Gabès, Université de Gabès, Cité Erriadh, 6072 Gabès, Tunisia
2
Arrondissement de Production Animale, CRDA de Gabès, Rue Abou Kacem Chebbi, Ministère de l’Agriculture Tunisien 6000 Gabès, Tunisia
3
Institut UTINAM, CNRS UMR 6213, Univ Bourgogne Franche-Comte, 16 route de Gray, 25030 Besançon Cedex, France
alloy is the magnesium–aluminum known as AA-5083. Despite its superiority as a biomaterial, it revealed an excellent mechanical behavior [8–10]. Nevertheless, this alloy suffers from localized corrosion attacks after a prolonged immersion into aggressive media [8, 9]. Previous investigations indicate that the passive film formed on the top of its surface, which is identified as a β-phase of M g2Al3, has a limited life cycle [11]. Furthermore, when the electrolyte’s anions attack is mainly hard and long (over than 10 h), the dissolution of the passive film can be followed by a significant dissolution of the base metal [8, 9, 12]. To overcome this issue, some solutions have been proposed, mainly the addition of an inhibitor to reduce the corrosion rate of the AA-5083. Many inorgani
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