【摘要】 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/L H2SO4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.更多还原

【Abstract】 The inhibition effect of metal-free phthalocyanine（H₂Pc）,copper pthalocyanine（CuPc） and zinc phthalocyanine（ZnPc） on mild steel in 1 mol/L H₂SO₄ was investigated by weight loss,electrochemical measurement and SEM observation.The weight loss results showed that the adsorption of these compounds obeyed to Langmuir isotherm;the potentio-dynamic curves indicated both anodic and cathodic processes of mild steel corrosion in H₂SO₄ were suppressed by phthalocyanines,the Nyquist diagram expressed as a capacity semi-circle,and charge transfer resistance R_t increased with the rising of pthalocyanines concentration;the surface morphology analysis of the tested samples also proved that the integrity of steel surface was enhanced and the corrosion was inhibited when added phthalocyanines;then the result of quantum chemical caluculation showed that the inhibition efficiency of phthalocyanines decreased with the increase of LUMO energy.更多还原