在钢筋表面制备不同ZIF-8添加量的Ce-Sol-gel膜在0.1 M NaCl + SCP中测得的电化学谱图和拟合结果图：(a) Nyquist 图 (插图是裸钢筋Nyquist 图)；(b) 和 (c) Bode 图；(d) 低频阻抗 ( |Z|_0.01Hz) 模值图；(e) 等效电路图： (e1) 裸钢筋；(e2) 钢筋表面Ce-Sol-gel 膜和添加不同含量ZIF-8 的Ce-Sol-gel膜；(f) 根据拟合结果得到R_tot (1.裸钢筋；2.Ce-Sol-gel；3. 1.6 wt. % ZIF-8@Ce-Sol-gel；4. 3.2 wt. % ZIF-8@Ce-Sol-gel；5. 4.8 wt. % ZIF-8@Ce-Sol-gel；6. 6.4 wt. % ZIF-8@Ce-Sol-gel；7. 8.0 wt. % ZIF-8@Ce-Sol-gel)。

The electrochemical spectra and fitting results of Ce-Sol-gel films with different amounts of ZIF-8 prepared on the surface of rebar were measured in 0.1M NaCl + SCP: (a) Nyquist diagram (illustration is Nyquist diagram of bare rebar); (b) and (c) Bode diagrams; (d) low-frequency impedance (|Z|0.01Hz) modulus diagram; (e) Equivalent circuit diagram: (e1) bare steel bar; (e2) Ce-Sol-gel film and Ce-Sol-gel film with different content of ZIF-8 added on the steel bar surface; (f) According to the fitting results, Rtot (1. Bare reinforcement; 2.Ce-Sol-gel; 3. 1.6 wt. % ZIF-8@Ce-Sol-gel; 4. 3.2 wt. % ZIF-8@Ce-Sol-gel; 5. 4.8 wt. % ZIF-8@Ce-Sol-gel; 6. 6.4 wt. % ZIF-8@Ce-Sol-gel; 7. 8.0 wt. % ZIF-8@Ce-Sol-gel).