Effect of gallium ions on the electrochemical behaviour of Al, Al–Sn, Al–Zn and Al–Zn–Sn alloys in chloride solutions

摘要: Abstract The effect of gallium ions on the electrochemical behaviour two grades aluminium, AlI (99.99%) and AlII (99.61%), as well three its alloys (Al–Sn, Al–Zn Al–Zn–Sn) has been investigated in 0.6 M NaCl solutions. study was performed by means polarization, potentiostatic current–time open circuit potential measurements complemented scanning electron microscope–energy dispersive X-ray analyzer investigations. It found that addition Ga3+ to electrolyte causes activation electrode. A pronounced activating influence achieved after cathodic polarization electrode containing at −2 V. This is attributed deposition surface which gives rise increased adsorption Cl− a more electronegative potential. On other hand, have no dissolution AlII, Al–Sn, Al–Zn–Sn electrodes However, appears only during