Abstract
Anodisation of AZ31 Mg alloy (3 mass%Al, 1 mass%Zn) was performed in 1M NaOH solution, with and without adding 35 mM of calcium hydroxide at various temperatures. The anodising process was carried out at constant potential 3 V; the change in current density during the first period of anodising revealed the mechanisms of anodic film formation. Adding 35 mM Ca(OH)2 to the solution improved the corrosion resistance, e.g. in 17 mM NaCl and 0·1M Na2SO4 solution at 298 K from anodic polarisation measurements. The anodic layer thickness increases with the amount of Ca(OH)2 added. The temperature of the solution also affects the anodising process; i.e. increasing the solution temperature improved the corrosion resistance of the anodised film.
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