十二烷基硫酸钠对铁电沉积行为的影响  

Effect of sodium dodecyl sulfate on electrochemical behavior of iron electrodeposition

作　　者：范冠博 潘秉锁[2] 田永常[2] 方小红[2] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《电镀与涂饰》2015年第9期471-475,共5页Electroplating & Finishing

摘　　要：为了解铁的电结晶机理及润湿剂十二烷基硫酸钠(SDS)对铁电沉积阴极过程的影响,采用线性扫描伏安法、单电位阶跃计时电流法、交流阻抗谱等手段对由200 g/L Fe SO4·7H2O、20 g/L H3BO3、50 g/L Mn Cl2和30 g/L配位剂组成的基础镀液和含0.2 g/L SDS的镀铁溶液中铁在玻碳电极上的电沉积行为进行了对比研究。结果表明,润湿剂的加入使铁电沉积的阴极极化增强。不管镀液中是否含有润湿剂,铁在玻碳电极上的电结晶都遵循三维瞬时成核理论,且在含有润湿剂的镀液中的结晶过程与理论模型有着更好的吻合程度。润湿剂的加入使反应物离子的扩散受阻,电荷传递电阻增大。这些变化可能与SDS在镀层表面的吸附和对表面张力的影响有关。The electrodeposition behaviors of iron on glassy carbon electrode from the bath composed of FeSO47H20 200 g/L, H3BO320 g/L, MnC1250 g/L, and complexing agent 30 g/L with and without 0.2 g/L sodium dodecyl sulfate （SDS） as wetting agent were comparatively studied by linear sweep voltammetry, single potential step chronoamperometry, and alternating current impedance spectroscopy to explore the mechanism of iron electrocrystallization and the influence of SDS on cathodic process of iron electrodeposition. The results showed that the cathodic polarization of iron electrodeposition is enhanced as a result of the addition of wetting agent. The electrocrystallization of iron on glassy carbon electrode follows the three- dimensional instantaneous nucleation theory no matter the plating bath contains wetting agent or not. The iron electrocrystallization in bath containing wetting agent is more consistent with the theoretical model. The diffusion of reactant ions is hindered due to the addition of wetting agent, resulting in an increase of charge transfer resistance. All of the above changes may have something with the adsorption of SDS and its effect on surface tension.

关 键 词：电镀铁 十二烷基硫酸钠 润湿剂 电结晶 成核机理 电化学 

分 类 号：TQ153.19[化学工程—电化学工业]