Intermetallic-Rich Layer Formation for Improving Corrosion Resistance of Magnesium Alloys

다국어 초록 (Multilingual Abstract)

The present work examines the formation of a corrosion protective coating containing intermetallic phases on magnesiumalloy substrates. The protective coating was formed on the surfaces of commercially pure magnesium (cp Mg) and AZ31Bmagnesium alloy by vacuum thermal evaporation of commercially pure aluminium (cp Al) and a subsequent heat treatmentof the sample. This coating was continuous, homogenous and its microstructure was a eutectic phase composed by clustersof α-Mg surrounded by β phase (Mg17Al12). This eutectic-type coating provided 168 and 504 h of protection inside the saltspray chamber for the cp Mg and AZ31 alloy samples, respectively. To achieve this, it was required to deposit at least 5.5 μmof cp Al and then perform a combined thermal treatment involving heating the samples to 583 K for 60 min and then raisingthe temperature to 693 K for 5 min.

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