Everyone who was corrputed was un-corrupted when Phaaze blew up.
Quote from TheGreenManalishi:
Everyone who was corrputed was un-corrupted when Phaaze blew up.
Speaking of that, at the end of Corruption, after Phaaze goes KABLOOEY!, you still see Samus with the Hyper Beam active. It could be completely unrelated to story, but what if Samus retained the Hyper Beam and its Phazon ammo?