Abstract
In this study, the microstructural evolutions and corrosion resistance of aluminium/copper joint fabricated through explosive welding process have been thoroughly investigated, while stand-off distance was variable. Microstructural analyses demonstrate that, regardless of grain refinement in the welding boundary, increasing the stand-off space is followed by a higher thickness of the localized melting pool. X-Ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS) analyses recognized the binary intermetallic layers as a combination of Al2Cu and AlCu. Polarization and electrochemical impedance spectroscopy (EIS) corrosion tests revealed that a higher stand-off distance resulted in the increment of corrosion potential, current rate, and concentration gradient at the interface owing to the remarkable kinetic energy of the collision, which impaired corrosion resistance.
Highlights
Explosive welding process can be employed as a novel method for the fabrication of a joint between two surfaces, which have a certain distance from each other, through controlling the energy of the explosion and high-speed collision of surfaces [1]
The explosion mixture composed from Amatol 95.5 (made by combining Trinitrotoluene (5%) and Ammonium Nitrate (95%)
(3.5% NaCl), a three-electrode electrochemical cell having a capacity of 500 mL was utilized as corrosive solution (3.5% NaCl), a three-electrode electrochemical cell having a capacity of 500 mL was utilized media for the polarization and electrochemical impedance spectroscopy (EIS) exams
Summary
Explosive welding process can be employed as a novel method for the fabrication of a joint between two surfaces, which have a certain distance from each other, through controlling the energy of the explosion and high-speed collision of surfaces [1]. Kengkla et al [7] have studied the effect of intermetallic compounds on the corrosion behaviour of triple-layered aluminium/steel explosive linkage in military industries. Their results confirmed the formation of Al3 Fe, Al5 Fe2 intermetallic compounds at the connection interface created a cathodic state. Kahraman et al [10] studied the corrosion resistance of an explosively joint between titanium and stainless steel They declared that, in corrosive media, increasing the amount of explosive charge, followed by adding to the mass of the connected plates due to the higher strain, led to the formation of extra oxide layers on the surface.
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