Abstract
The aim of the present work was to evaluate the influence of the microstructure on the formation-biodegradation mechanism of conversion coatings synthesised on the AZ31 magnesium alloy by immersion in HF solutions under different concentrations and treatment times. The experimental results revealed the formation of a magnesium hydroxyfluoride layer, which enhanced the corrosion resistance of the AZ31 alloy in Hanks' solution. Furthermore, the presence of intermetallic particles within the α-Mg matrix favoured the formation of defects that promoted the growth of corrosion products causing the detachment of the fluoride coating, all before it may start to be noticeably biodegraded.
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