Fig. 11: Cross-section morphology of surface passive film of Nb-containing rebar and CS rebar after passivation for 10 d in SCPS with different pH.
a–d pH13.2. e–h pH12.5. i–l pH10.5. m–p pH9.0. (a, e, i, m CS. b, f, j, n LNb. c, g, k, o MNb. d, h, l, p HNb).
