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  • 1.
    Eslami, Maryam
    et al.
    Univ Trento, Dept Ind Engn, Trento, Italy.
    Deflorian, Flavio
    Univ Trento, Dept Ind Engn, Trento, Italy.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Electrochemical Behavior of Conventional and Rheo-High-Pressure Die Cast Low Silicon Aluminum Alloys in NaCl Solutions2019In: Corrosion, ISSN 0010-9312, E-ISSN 1938-159X, Vol. 75, no 11, p. 1339-1353Article in journal (Refereed)
    Abstract [en]

    The electrochemical behavior of a low silicon aluminum alloy cast by the conventional and rheo-high-pressure die cast processes is evaluated using polarization test and electrochemical impedance spectroscopy in 0.01 M, 0.05 M, 0.1 M, and 0.6 M sodium chloride solutions. Compared to the conventional high-pressure die cast process, rheocasting introduces some alterations in the microstructure including the presence of aluminum grains with different sizes, formed at different solidification stages. According to the results of the anodic polarization test, conventional cast and rheocast samples show similar breakdown potentials. However, the rheocast samples present enhanced oxygen reduction kinetics compared to the conventional cast sample. Based on scanning electron microscopy examinations, localized microgalvanic corrosion is the main corrosion mechanism for both alloys and it initiates at the interface of aluminum with iron-rich intermetallic particles which are located inside the eutectic regions. The corrosion further develops into the eutectic area. Although the rate of the cathodic reaction can be influenced by the semisolid microstructure, according to the results of anodic polarization and electrochemical impedance spectroscopy tests, the corrosion behavior is not meaningfully affected by the casting process.

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  • 2.
    Eslami, Maryam
    et al.
    Department of Industrial Engineering, University of Trento, Trento, Italy.
    Speranza, Giorgio
    Center for Materials and Microsystems, Fondazione Bruno Kessler (FBK), Trento, Italy.
    Fedel, Michele
    Department of Industrial Engineering, University of Trento, Trento, Italy.
    Andersson, Nils-Eric
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Deflorian, Flavio
    Department of Industrial Engineering, University of Trento, Trento, Italy.
    Omanovic, Sasha
    Department of Chemical Engineering, McGill University, Montreal, Canada.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Electropolymerization and possible corrosion protection effect of polypyrrole coatings on AA1050 (UNS A91050) in NaCl solutions2019In: Corrosion, ISSN 0010-9312, E-ISSN 1938-159X, Vol. 75, no 7, p. 745-755Article in journal (Refereed)
    Abstract [en]

    Effect of solution chemistry on the electropolymerization and the electrochemical properties of polypyrrole coatings on aluminum is studied by means of electrochemical techniques, scanning electron microscopy (SEM), and x-ray photoelectron spectroscopy. It is shown that the protection effect of the coating in long-term exposures and when exposed to more concentrated NaCl solutions depends on the chemistry of electropolymerization electrolyte. The results show that nitrate anions passivate the aluminum substrate during the electropolymerization process. The resulting coating is less prone to blistering in a NaCl solution and probably due to its higher electrochemical activity presents a higher anodic protection effect. The galvanic interaction of polypyrrole coating with aluminum in a NaCl solution is directly observed using focused ion beam-assisted SEM.

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