Abstract
The Cu/Al composites conductive head is widely used in hydrometallurgy as the core component of cathode plate. Its conductive properties directly affect the power consumption, and the bonding strength and corrosion resistance determine the conductive head service life. The Cu/Al conductive head prepared by explosion welding, cold pressure welding, and solid-liquid casting methods were investigated in this paper. The interface microstructure and compositions were examined by scanning electron microscope and X-ray energy dispersive spectrometry. The bonding strength, interface conductivity, and the corrosion resistance of three types of joints were characterized. The Cu/Al bonding interface produced by explosive welding presented a wavy-like morphology with typical defects and many of brittle compounds. A micro-interlocking effect was caused by the sawtooth structures on the cold pressure welding interface, and there was no typical metallurgical reaction on the interface. The Cu/Al bonding interface prepared by solid-liquid casting consisted mainly of an Al-Cu eutectic microstructure (Al2Cu+Al) and partial white slag inclusion. The thickness of the interface transition layer was about 200–250 µm, with defects such as holes, cracks, and unwelded areas. The conductivity, interfacial bonding strength, and corrosion resistance of the conductive head prepared by explosive welding were superior to the other two.
Highlights
Cu/Al composites structures are widely used in electric power, automobiles, electronics, hydrometallurgy, and other fields, due to their corrosion resistance and the light weight properties ofAl, as well as the high electrical conductivity, high thermal conductivity, and low contact resistance ofCu [1,2,3,4]
This paper focused on the application of a Cu/Al composite structure as a conductive head in the zinc hydrometallurgical system
The samples of the Cu/Al cathode conductive head prepared by explosion welding, cold pressure welding, and solid-liquid casting were investigated in this study
Summary
Cu/Al composites structures are widely used in electric power, automobiles, electronics, hydrometallurgy, and other fields, due to their corrosion resistance and the light weight properties ofAl, as well as the high electrical conductivity, high thermal conductivity, and low contact resistance ofCu [1,2,3,4]. Cu/Al composites structures are widely used in electric power, automobiles, electronics, hydrometallurgy, and other fields, due to their corrosion resistance and the light weight properties of. As well as the high electrical conductivity, high thermal conductivity, and low contact resistance of. The batteries of electric vehicles require a high number of Cu/Al connections, and the hydrometallurgical cathode plates require Cu/Al composite conductive heads. Al to Cu effectively [5,6]. Cu and Al are relatively negative metals, and they have good intermiscibility [7]. Certain phases (such as Al2 Cu, Al4 Cu9 , etc.) have a significant effect on the electrical conductivity and bonding strength of the interface [8,9,10,11]
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