Enhanced Mechanical Properties and Microstructure of Accumulative Roll-Bonded Co/Pb Nanocomposite.

Maryam Karbasi,Fariborz Tavangarian,Eskandar Keshavarz Alamdari,Elahe Amirkhani Dehkordi,Zulfiqar A Khan

doi:10.3390/nano11051190

Maryam Karbasi, Fariborz Tavangarian + Show 3 more

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https://doi.org/10.3390/nano11051190

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Abstract

Lead composites have been used as anodes in the electrowinning process to produce metals such as copper and zinc. Manufacturing stable lead anodes with appropriate mechanical and chemical properties is required to improve the performance of the electrowinning process. In this study, an accumulative roll bonding (ARB) method was used to fabricate a Co/Pb nanocomposite. Utilizing the ARB method can help us to achieve a uniform structure with enhanced mechanical properties via severe plastic deformation. The results showed that suitable tensile properties were obtained in Pb–0.5%Co–10pass samples. The tensile strength and strain of these samples were 2.51 times higher and 83.7% lower than that of as-cast pure Pb. They also showed creep resistance and hardness up to 1.8 and 2.5 times more than that of as-cast pure Pb. The ARB technique uniformly distributed Co particles in the Pb matrix. The enhanced strength of Pb samples was observed in the composite including grain sizes of less than 50 nm as a result of hindering the recovery phenomenon. The particle size of the Co distributed in the Pb matrix was 353 ± 259 nm. Compared to conventional methods, the ARB process improved the mechanical properties of Co/Pb composites and can open a new horizon to fabricating this composite in metal industries.

Highlights

The electrowinning process is one of the essential methods in producing metals such as copper and zinc
It is evident from the results that, with the increasing number of accumulative roll bonding (ARB) cycles, strain and tensile strength decreased and increased, respectively
Pb–0.5%Co–10pass had the highest tensile strength (which was 2.51 times higher than that obtained from the pure Pb strip (Table 3)) and the lowest strain (14% in comparison with 87% for the Pb 0–pass sheet (Table 3))

Summary

Introduction

The electrowinning process is one of the essential methods in producing metals such as copper and zinc. Electrowinning is the cathodic reduction of a metal from a metallic ion containing an aqueous solution via an electrical current using the electrolysis method [1] In this technique, the final products such as Zn and Cu are deposited on an Al, Ti, or steel [2] cathode. Anodes should have some specifications such as high electrical conductivity (high energy productivity) and long-term stability (high corrosion and wear resistance, which sustain the initial dimension of anodes in acidic solutions). These properties decrease product contamination, energy and materials consumption, as well as maintenance costs [3]

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