Corrosion behavior of Mg-Y alloy in NaCl aqueous solution

The corrosion behavior of Mg-(0.25, 2.5, 5, 8 and 15)Y alloys in 3.5wt.% NaCl aqueous solution was investigated. It was found that the degree of corrosion deterioration increased with increasing immersion time up to 2 h. Corrosion modes for the alloys with low and high content of Y element were general corrosion and pitting corrosion, respectively, and the threshold content for the corrosion mode change was 2.5 A for the tested alloys. The experimental results showed that the addition of Y refined the grain of the alloy, and the distribution, i.e., continuous or not, of the Mg24Y5 phases had great effect on the corrosion rate and corrosion mode. (C) 2012. Chinese Materials Research Society. Production and hosting by Elsevier Ltd. All rights reserved.