The colouring of magnesium alloy articles that have been anodized (or otherwise chemically oxidised) has defeated most attempts by experimenters attempting to provide a range such as is available for anodized aluminium. A new anodizing process based on an environmentally friendly electrolyte solution that contains none of chromate, phosphate of fluoride can do colouring and give a luster on AZ31 Mg alloy surface. Anodizing behaviours of magnesium and its alloys are influenced by many factors, including the constituents and concentrations of electrolyte solution, the nature of basis metal as well as applied current density of voltage, treatment time and solution temperature, etc. Therein, the electrolyte solution plays a determinant role. Applied constant current can ensure that anodic films grow at an almost uniform rate.  Corrosion resistances of the films were analyzed from results of the anodic polarization measurement in 0.1 mass% NaCl solution. Microstructure and phase composition were analyzed by SEM and XRD. The basic mechanism of anodic coating formation is explained.

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