Composition and structure of Al–Sn alloys formed by constant potential electrolysis in an AlCl3–NaCl–KCl–SnCl2 molten salt

Abstract

To form Al-Sn alloys for bearing materials, molten salt electrolysis was performed in an AlCl 3 -NaCl-KCl molten salt containing SnCl 2 at 423 K. The voltammogram showed that the cathodic reduction of the Sn ions started at a potential of 0.5 V vs.Al/Al(III) in the molten salt showing that deposition of pure Sn was possible at 0.5 V.Co-deposition of Al and Sn occurred at potentials more negative than 0.1 V. The co-deposit was composed a solid solution of Al and Sn. The ratio of the Sn in the electrodeposits decreased with the potential from 100 at% at 0.2 V to 19 at% at -0.3 V.In the structural observations, electrodeposits with an alternate stacked structure of Al and Sn is obtained at -0.075V.

Electroplating of Al-Zr alloys in AlCl3-NaCl-KCl molten salts to improve corrosion resistance of Al

“…The authors have proposed a resistive coating of Al alloy layers produced by electroplating of substrates with molten salt [7][8][9]. There have been a number of papers on the formation of alloy electrodeposits of Al-Cr, Al-Ni, AlMn, and Al-Ti with low-temperature molten salts [10][11][12][13][14][15][16].…”

Dissolution Characteristics of Al-Si Alloys in AlCl₃-NaCl-KCl Molten Salt at 423 K

“…16 The electrodeposition of Al using the AlCl 3 -NaCl-KCl molten salt was investigated in previous studies. [17][18][19][20] This study aims at electrorefining using this molten salt as an electrolyte at a relatively low temperature and by utilizing lesser energy.…”

Solid State Phase Equilibria of an Al–Sn–Y Ternary System

“…Al–based alloys, which consist of Al–Pb and Al–Sn, are widely used for sliding bearing applications due to their good load carrying capacity, fatigue resistance, wear resistance and sliding properties [1,2,3]. However, because of toxic Pb, environmental legislation has driven manufacturers to eliminate Pb from bearing alloys.…”

“…Thus, the focus has been concentrated on Al–Sn alloys. Al–Sn based alloys are simple eutectic binary alloy systems with solid solutions of a wide range of compositions and are well known as soft tribological alloys [3]. However, the main challenges of Al–Sn based alloys are that the strength of alloys is generally low and can easily form a near-continuous large Sn zone that weakens the interface bonding [4].…”