空白钢筋、钢筋表面形成的无/有Ce³⁺改性的溶胶-凝胶膜(Ce³⁺ 浓度为0.5 M)在0.1 M NaCl 混凝土模拟液中的EIS光谱：(a) Nyquist图；(b) 图(a)对应的局部放大倍数；(c)Bode图；(d)最佳条件下制备的溶胶-凝胶膜EIS图和拟合图；(e)对应的等效电路：(e₁) HRB 400；(e₂)最优样品；(f)不同膜层 R_tot图对应的数据

EIS spectra of sol-gel films without or with Ce3+ modification formed on the surface of blank steel bars and steel bars (Ce3+ concentration is 0.5 M) in 0.1 M NaCl concrete simulation solution: (a) Nyquist diagram; (b) the local magnification corresponding to figure (a); (c)Bode diagram; (d) EIS diagram and fitting diagram of sol-gel film prepared under optimal conditions; (e) Corresponding equivalent circuit: (e1) HRB 400; (e2) optimal sample; (f) Data corresponding to Rtot maps of different film layers