Table 3 Binding energy position and band width of each element (Nb element, Fe element, O element) in the surface passive film of HNb rebar and CS rebar after passivation for 10 d in SCPS with pH13.2 and pH9.0

13.2

CS

Fe

Fe⁰

706.72^18,36,59,60

0.96

Fe²⁺

708.44, 728.81^{12,13,14,22,24,25,59,60}

3.36, 3.36

Fe³⁺

711.19, 719.99^{12,13,14,24,25,59,60}

3.36, 3.36

FeOOH

723.77^{24,25,54,59,60}

3.36

O

O^2-

529.97^{12,13,14,20,25,59,60}

1.15

OH^-

531.18^{20,22,24,25,59,60}

2.11

H₂O

531.76^{12,13,14,24,25,59,60}

2.90

HNb

Fe

Fe⁰

706.88^18,36,59,60

1.43

Fe²⁺

709.87, 726.59^{12,13,14,22,24,25,59,60}

3.36, 3.36

Fe³⁺

713.17, 719.89, 729.91^{12,13,14,24,25,59,60}

2.93, 3.08, 3.36

FeOOH

723.91^{24,25,54,59,60}

3.36

O

O^2-

530.17^{12,13,14,20,25,59,60}

1.12

OH^-

530.80^{20,22,24,25,59,60}

1.97

H₂O

532.17^{12,13,14,24,25,59,60}

2.16

Nb

NbO

204.35^{28,29,30,31,32,33}

1.27

NbO₂

205.22^{28,29,30,31,32,33}

1.29

Nb₅O₂

-

-

9.0

CS

Fe

Fe⁰

706.65^18,36,59,60

0.89

Fe²⁺

707.77, 727.27^{12,13,14,22,24,25,59,60}

2.49, 3.36

Fe³⁺

710.08, 720.01, 732.26^{12,13,14,24,25,59,60}

2.16, 3.29, 3.36

FeOOH

713.12, 724.04^{24,25,54,59,60}

3.36, 3.36

O

O^2-

530.33^{12,13,14,20,25,59,60}

1.52

OH^-

531.44^{20,22,24,25,59,60}

1.00

H₂O

532.17^{12,13,14,24,25,59,60}

1.20

HNb

Fe

Fe⁰

706.63^18,36,59,60

0.86

Fe²⁺

707.71, 728.28^{12,13,14,22,24,25,59,60}

2.46, 3.36

Fe³⁺

711.20, 719.87, 732.93^{12,13,14,24,25,59,60}

2.70, 3.10, 3.36

FeOOH

712.96, 724.95^{24,25,54,59,60}

3.36, 3.36

O

O^2-

530.06^{12,13,14,20,25,59,60}

1.22

OH^-

531.38^{20,22,24,25,59,60}

1.86

H₂O

531.97^{12,13,14,24,25,59,60}

3.20

Nb

NbO

204.37^{28,29,30,31,32,33}

1.70

NbO₂

205.24^{28,29,30,31,32,33}

1.53

Nb₅O₂

206.65^{28,29,30,31,32,33}

1.21