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M. I. Barrena,J. M. Gómez de Salazar,J. M. Vázquez,García-Cano,J. M. Guilemany 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.4
Protective surface coatings on an AZ91D magnesium alloy were formed in an atmosphere mixture ofnitrogen and 1,1,1,2-tetrafluoroethane (HFC-134a). The surface composition and microstructure were characterizedusing X-ray diffraction analysis and scanning electron microscopy, respectively. The cross-sectionmorphologies of the coatings show that an increase in conversion time results in an increase in thecontinuity and compactness of the coating generated on the surface of the AZ91D alloy. The corrosionresistance tests performed by immersion into 3.5% NaCl solutions were investigated by electrochemicalmeasurements. The results showed that the coated samples had higher corrosion resistance than the uncoatedalloy. On the other hand, the corrosion density of the coated samples decreased by increasing theconversion time by about two orders of magnitude, compared with the un-coated samples. This behaviouris attributed to the formation of a protective surface film constituted mainly for MgF2, together with otherphases. The nature of these phases depends on the process conditions.