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(a) Evolved H2 gas after immersion in SBF solution of bare, PEI-coated, and Ta/PEI-coated Mg samples for 10 days. μ-CT characterization of bare, PEI-coated, and Ta/PEI-coated Mg implants after 14 days of immersion in SBF solution: (b-1) 3D images of each implant at 0, 3, 6, and 14 days of immersion and their (b-2) remaining volumes. (c) The implants' calculated corrosion rates. Statistical significance is indicated by *p < 0.05 and **p < 0.01 compared with bare Mg.
