采用动电位极化技术结合电化学阻抗谱测量,研究了pH值对2024-T351铝合金在0.6mol·L-1 NaCl溶液中腐蚀电化学特性的影响规律.结果表明,在pH=5～7的NaCl溶液中,铝合金表面可生成稳定的氧化膜,阻抗谱出现两个容抗弧.随着溶液pH的降低,极化曲线上的阴极电流密度逐渐增加,且氧化膜厚度减薄,膜电阻和电荷转移电阻均有所降低,这表明,氧化膜的保护性能随pH的减小而降低.在酸性(pH=3)NaCl溶液中,阻抗谱变为一个容抗弧,说明铝合金表面的氧化膜难以稳定存在,基体合金直接与溶液接触,极化曲线表现出基体合金的电化学特性.
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