无金属酞菁、酞菁铜和酞菁锌在1mol/L H_2SO_4中对Q235钢的缓蚀作用  

INHIBITION EFFECT OF METAL-FREE PHTHALOCYANINE,COPPER PHTHALOCYANINE AND ZINC PHTHALOCYANINE ON MILD STEEL IN 1 mol/L H_2SO_4

作　　者：赵澎[1] 李焰[1] 梁强[2] 

机构地区：[1]中国科学院海洋研究所 [2](青岛大学师范学院化学系,青岛266071

出　　处：《腐蚀科学与防护技术》2006年第4期235-240,共6页Corrosion Science and Protection Technology

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.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.

关 键 词：酞菁化合物 缓蚀剂 电化学实验 SEM 量子化学 

分 类 号：TG174.42[金属学及工艺—金属表面处理]