Abstract
A surface potential analysis was carried out to establish a new materials design of pure Ti/Mg-Al alloy dissimilar materials with an excellent galvanic corrosion resistance. The formation of Ti-Al intermetallic interlayer and Al diffusion layer at interface effectively reduced the surface potential difference at the interface. As a result, a formation of local cells, causing a galvanic corrosion phenomenon of Ti/Mg alloy dissimilar material, was prevented because the potential difference of Mg alloy with Ti-Al interlayer completely decreased. A salt water immersion test obviously indicated no Mg(OH)2 corrosion product on Mg alloy surface due to Ti-Al interlayer formation, and the initial galvanic corrosion phenomenon was effectively obstructed.
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