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无金属酞菁、酞菁铜和酞菁锌在1mol/LH2SO4中对Q235钢的缓蚀作用

, PP. 235-240

Keywords: 酞菁化合物,缓蚀剂,量子化学

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Abstract:

通过失重实验、电化学测试和扫描电子显微镜研究了无金属酞菁(H2Pc)、酞菁铜(CuPc)和酞菁锌(ZnPc)在1mol/LH2SO4中对碳钢的缓蚀作用.结果表明,3种酞菁化合物的缓蚀能力依次为ZnPc>CuPc>H2Pc,其吸附数据均符合Langmuir等温式;它们能同时抑制碳钢在H2SO4中腐蚀的阴极和阳极过程,电化学阻抗谱显示,为变形的单容抗弧,阻抗值随酞菁化合物浓度增加而增加;表面形貌分析也证明了酞菁化合物的加入提高了碳钢的表面完整性,抑制其腐蚀;量子化学计算结果显示,随着分子的最低空轨道(LUMO)的能量升高,酞菁化合物的缓蚀能力降低.

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