Abstract
The anodic polarisation behaviour of Ni–Ti shape memory alloy (SMA) in three different microstructural conditions, namely parent phase (β), martensite phase, and 30% cold worked martensite phase, was studied in simulated human body media, namely Hank's physiological solution and artificial saliva. Annealed 316L stainless steel was also studied for comparison. The passivity of the alloys was found to be unstable in chloride containing media. The critical anodic current density for passivity of 316L wasfound to be higher than that for Ni–Ti SMA. Microscopic studies revealed that the NiTi2 intermetallic phase may act as preferential sites for pit initiation in Ni–Ti SMA.
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