本文采用电化学和痕量分析方法,研究了在连续引进铜离子的去氧酸性氯化钠溶液中α+β两相黄铜的脱锌行为。溶液分析得到的铜、锌离子量随时间的变化与指示铜电极电位随时间的变化,都可以提供黄铜表面上铜沉积的信息。实验结果证明,两相黄铜在实验条件下腐蚀时发生显著的铜再沉积现象,其共轭反应为锌的溶解,故此造成严重脱锌。实验测得,引起铜再沉积的铜离子浓度下限低于10~(-4)M,铜再沉积的表观速度常数为3.7×10~(-4)sec~(-1)。文中还提出了实验体系中的反应模型,并与实验结果进行了比较。
By means of electrochemical and trace amount analysis techniques the dezincification behavior of α+β biphase brass in a deaerated acidified solution of sodium chloride under condition of continuous introduction of Cu~+ into solution was studied. The changes of the indicator electrode potential with time could provide information of the copper deposition on the brass surface. Similar results were obtained by trace amount analysis method. Experimental results show that corrosion of biphase brass under experimental conditions follows the dissolution-redeposition mechanism. It was shown that the reduction of Cu~+ was compensated by the dissolution of Zinc from brass. Thus, serious dezincification took place on the surface of biphase brass. Experimental results indicated that the limiting concentration of Cu~+ which caused copper redeposition was below 10~(-4) M. Apparent rate constant of copper redeposition was 3.7×10~(-4) sec~(-1). A model was suggested and compared with experimental results.
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