全光亮镀铁工艺的研究

Study on the Bright Iron-Plating

介绍了一种新型的电镀光亮铁的工艺 ,使用了“抑氢剂”,并用小槽电镀、Hull Cell实验研究了镀液的性能 .还运用线性电位扫描法、旋转圆盘电极法测试了镀液的阴极极化性能和整平性能 ;采用 SEM法观察镀层的形貌 .实验结果表明 :光亮剂的加入可增大铁沉积时的阴极极化 ,并伴有整平作用 ;而抑氢剂可增大氢在铁上析出的过电位 ,从而可提高铁沉积的电流效率并降低镀层的应力 .

A new technique of bright Iron-plating was introduced and the 'hydrogen inhibitor' was used firstly in the electroplating. The properties of plating solution were tested with small plating bath and Hull Cell. In addition, the capabilities of cathodic polarization and leveling were studied by the means of linear potential sweep and rotating disk electrode. The features of coat were examined by the SEM., The experimental results showed, the brightener raised the cathodic polarization and leveling property in the plating solution, and hydrogen inhibitor raised overpotentials of hydrogen evolution on the Fe surface and raised cathodic current efficiency and reduce the internal stress of iron-plating coat.The components and operating conditions of Iron-plating solution are: ferrous sulfate(FeSO 4·7H 2O) 350 to 500 g·L -1 , sulfamic acid(NH 2SO 3H) 20 to 25 g·L -1 ,boric acid (H 3BO 3) 30 to 45 g·L -1 ,sodium chloride(NaCl) 80 to 90 g·L -1 ,saccharine 3 to 5 g·L -1 , accelerator (WDZ-99A) 10 -1 5 mL·L -1 ,brightener(110) 3 to 5 mL·L -1 , hydrogen inhibitor(WDZ-01) 5 to 10 mL·L -1 . Cathodic current density: 0.5 to 10.0 A·dm -2 , solution temperature:50 to 60℃.