International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 04 | Apr 2024
p-ISSN: 2395-0072
www.irjet.net
Sustainability of Aluminum-based alloys in Chloride Ions Containing Environment Momtazul Haquea, O.S Bhatiab Lovneesh Sharmac aM.Tech Scholar, Department of Mechanical Engineering, Universal Institute of Engineering & Technology, Lalru bProfessor, Department of Mechanical Engineering, Universal Institute of Engineering & Technology, Lalru c Assistant Professor, Department of Civil Engineering, Universal Institute of Engineering & Technology, Lalru
-----------------------------------------------------------------------------***-------------------------------------------------------------------------Abstract: The fabrication of the alloys was carried out through a melting and casting method under an argon atmosphere to ensure the preservation of their inherent properties. The characterization of these samples was conducted using X-ray diffraction (XRD) and Differential Scanning Calorimetry (DSC). Vickers hardness testing apparatus was utilized to assess the mechanical properties of the alloys. The objective behind modifying the Al-12Si alloy composition was to decrease the brazing filler's melting point, a hypothesis that was later confirmed through DSC analysis. Subsequently, the alloys' resistance to corrosion was evaluated using an electrochemical potentiostat in environments containing 3.5 wt% NaCl and 0.1 M H2SO4. This allowed for a comprehensive comparison of corrosion behaviors across the various alloy compositions, focusing specifically on metrics such as corrosion current density (icorr), corrosion potential (Ecorr), and the overall rate of corrosion. Keywords: Brazing filler, X-ray diffraction, Optical microscopy, Differential scanning calorimetry, Corrosion Introduction: In the fabrication of thermoelectric modules, brazing is identified as the predominant technique for joining components, leveraging a bonding agent with a melting point below those of the components being bonded. This method necessitates elevating the assembly's temperature above the bonding agent's melting point — specifically, temperatures must surpass 450°C to distinguish brazing from soldering, which employs fillers melting below this temperature [1-4]. Recent investigations have aimed at curtailing the formation of intermetallic compounds by introducing high entropy alloys as innovative brazing fillers. Such approaches have previously facilitated the effective bonding of nickel-based superalloys and solid oxide fuel cells (SOFCs) [5,6]. The high entropy concept posits that an alloy comprising multiple components in equal proportions can reduce the emergence of complex phases, favoring the development of a random solid solution where alloying elements are evenly distributed [7,8]. This notion was further illustrated by Yeh et al., who demonstrated that a high entropy value promotes the formation of a random solid solution, enhancing the alloy's homogeneity [9,10]. Particularly, the equimolar high entropy alloy Al-Si-Sn-Zn-Cu was explored as a filler material for vacuum brazing applications, especially for joining Al-based superalloys. Remarkably, the liquidus temperature of this alloy stands at 1346 degrees Celsius, significantly exceeding the solution treatment temperature range for Mar-M 247, typically between 1080 and 1170 degrees Celsius [11]. The initiative to modify the Al-12Si alloy aimed at reducing the brazing filler's melting point has been substantiated through DSC analysis. Furthermore, the corrosion resistance of the developed alloys was assessed in a 3.5 wt% NaCl solution, enabling the comparison of corrosion parameters across the various alloys produced.
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