利用动电位极化曲线、交流阻抗技术及Mott-Schottky曲线等方法,研究了钼酸钠对钢筋在5%NaCl混凝土模拟液中的电化学腐蚀行为和表面钝化膜性能的影响.结果表明:随钼酸钠浓度增大,缓蚀效率逐渐增加,对钢筋的腐蚀有较好地抑制作用,药剂在钢筋表面的吸附可有效屏蔽氯离子的侵蚀作用;Mott-Schottky结果表明,在-0.5～0.1 VSCE>范围内,混凝土模拟液中钢筋表面钝化膜Csc-2-E曲线呈正线性相关,表明钢筋表面钝化膜为n型半导体,且随钼酸钠浓度增大,钢筋钝化膜载流子密度逐渐减小,钝化膜稳定性增强,耐蚀性逐步提高;钝化膜致密性分析表明,随铜酸钠浓度增大,钝化膜致密性增加,抗氯离子腐蚀能力增强.
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