葡萄糖抑制铅在硫酸中的电化学腐蚀机理的研究

Mechanism of the inhibition of glucose on electrochemical corrosion of lead in sulfuric acid solution

研究了添加剂对铅在硫酸电解液中电化学腐蚀的影响,着重研究了由于电极腐蚀程度不同而产生的偏移氧化峰(AEP)。采用循环伏安法、线性电势扫描联合电位阶跃法等电化学方法表征了葡萄糖和氟化钠对AEP的影响,同时采用扫描电子显微镜表征了添加剂对腐蚀电极的表面形貌变化。结果表明,葡萄糖明显提高了AEP,抑制了铅电极的腐蚀。同时,提出葡萄糖提高AEP的机理是葡萄糖与电极表面胶体二氧化铅形成配位体,覆盖在电极表层,抑制溶液离子向内层扩散。

Here we report a new way to investigate the electrochemical corrosion of lead electrode in sulfuric acid solution by the anodic excursion peaks（AEPs）,a curious phenomenon appearing during the lead electrode corroded in H2SO4 at the positive potential range.Cyclic voltammetry（CV）,linear sweep voltammetry（LSV） combined with potential step method,and scanning electronic microscopy（SEM） have been conducted to investigate the effects of glucose and NaF on the behavior of AEPs.The results show that glucose increases AEPs,but inhibits the corrosion of lead electrode.The mechanism of the inhibition of glucose on corrosion of lead was proposed that the glucose molecules are adsorbed on surface of lead electrode through the coordinate bond between glucose molecule and PbO2 gel layer,and the glucose molecule layer inhibits the transfer of OH-ion into the inner layer of lead electrode.