The present research examined the corrosion and crevice corrosion behavior of porous specimens of Ti35Zr28Nb and CP Ti in Hanks’ solution at 37 °C and in 3.5 wt% NaCl at 95 °C. The following conclusions can be drawn. There was no crevice corrosion for porous specimens of Ti35Zr28Nb and CP Ti in Hanks’ solution at 37 °C and in 3.5 wt% NaCl at 95 °C. Both alloys had low corrosion rates in both solutions, and both alloys were passive in both solutions.

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The project tested the biocompatibility of porous Ti35Zr28Nb scaffolds using comparative electrochemical methods with CP2-Ti samples. This is done by assessing the corrosive resistance of specimens under artificially simulated conditions. Crevice corrosion tests involved immersion of samples in Hank's at 37.5℃ and 3.5 wt.% NaCl solution at 95℃ in turbulent conditions for 28 days. Electrochemical tests used include OCP open circuit potential, PC polarisation curves, and a range of EIS curve outputs, in both Hank's and NaCl solution. The average mass loss for both sample types immersed in Hank's and NaCl solutions was 23.33 ±10 , and 18.33± 10 respectively. Neither the Ti35Zr28Nb or CP2-Ti showed a preference to lose mass and the result was below the expected mass loss ranges of 92.2 ±10 for low porosity, and 147.3 ±10 for high porosity. This conclusively shows that the crevice corrosion mechanism for both the Ti35Zr28Nb and CPTi-2 samples did not reach critical levels in either testing configuration. The morphology of the SEM tests revealed that an oxide layer had formed, but no signs of crevice corrosion were visible. The Ti35Zr28Nb and CPTi-2 samples showed compatible passivation currents ranging from 1.97-3.78 (/ 2). The Ti35Zr28Nb samples also showed lower average open circuit potential values by roughly 100mV in 3.5% NaCl solution. Wide capacitance arcs in the EIS tests for the Ti35Zr28Nb were in a compatible range with the CPTi-2, showing the formation of a passive oxide film. Both the Ti35Zr28Nb and CP2-Ti samples showed a preference in corrosive properties compared to steel type 316L. A major testing discrepancy was evident from a high-porosity CP2-Ti sample EIS test results for Hank's solution. Re-testing this sample may be required to rectify the issue, most likely caused by connectivity problems.