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应用循环伏安与动电位极化曲线确定普通低碳钢与细晶粒钢在碱性介质(模拟混凝上孔隙液)中的钝化区域.利用计时电流法在选取的阳极极化电位下使钢筋生成稳定的钝化膜,并通过电化学阻抗谱、Mott-Schottky曲线比较了钢筋在不同阳极电位下形成的钝化膜的优劣性;其次,循环极化曲线对比分析了在有无Cl~-存在时普通低碳钢与细晶粒钢钝化膜的耐蚀性.结果表明,2种钢筋的公共钝化电位区域为-0.25—+0.6V,在选取的+0.3V阳极极化电位下2者均能形成更稳定的钝化膜.在无Cl~-存在的条件下,细晶粒钢钝化膜的稳定性与耐蚀性均略优于普通低碳钢;但有Cl~-存在时,细晶粒钢抑制Cl~-点蚀的能力稍弱于普通低碳钢.影响细晶粒钢钝化膜耐蚀性的主要原因是晶界数量与微量元素含量.
Cyclic voltammetry and potentiodynamic polarization curves were used to determine the passivated area of common mild steel and fine grain steel in alkaline medium (simulated coagulation pore fluid) .Using chronoamperometry, the anodic polarization potentials So that a stable passivation film was formed by the reinforcing bar. The electrochemical impedance spectroscopy and Mott-Schottky curve were used to compare the advantages and disadvantages of the passivation film formed by reinforcing steel under different anode potentials. Secondly, the cyclic polarization curve was used to analyze the presence or absence Corrosion resistance of common mild steel and fine grained steel passivation film in presence of Cl ~ - was studied.The results showed that the common passivation potential of the two kinds of steel was -0.25- + 0.6V, The formation of a more stable passivation film can be obtained under both potentials.The stability and corrosion resistance of the fine grained steel passivation film are better than ordinary mild steel in the absence of Cl ~ In the presence of Cl ~ -, the ability of fine grained steel to inhibit Cl ~ - pitting is slightly weaker than that of ordinary low carbon steel.The main factors affecting the corrosion resistance of fine grained steel passivation film are grain boundary number and trace element content.