Abstract
Mg-2Zn-0.46Y-0.5Nd alloy coated with pure Zn layer of about 750 μm was prepared by friction stir processing technique. The Zn layer was strongly bonded with the Mg alloy substrate and no intermetallic compounds were found at the Zn/Mg alloy interface. In the center of the coated Zn layer, a bonded structure consisting of coarse Zn and fine Mg alloy grains were formed due to the flowing of the materials from the lower to the upper plate. The electrochemical tests in 3.5% NaCl solution showed that the corrosion current density of Zn layer coated FSPed Mg alloy was only about 2.41 × 10−6 A/cm2, significantly lower than 2.01 × 10−5 A/cm2 of the uncoated FSPed Mg alloy. In addition, the FSPed Mg alloy with Zn layer showed uniform surface morphology after corrosion tests, which was very different from the severe pitting corrosion of the uncoated counterpart.
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