应用化学 ›› 1997, Vol. 0 ›› Issue (5): 104-106.

• 研究论文 • 上一篇    下一篇

黄铜脱锌的抑制

汪的华, 邹津耘, 邱万川, 杨兴和   

  1. 武汉大学环境科学系, 武汉 430072
  • 收稿日期:1996-12-08 修回日期:1997-06-20 出版日期:1997-10-10 发布日期:1997-10-10
  • 基金资助:
    金属腐蚀与防护国家重点实验室;国家自然科学基金

Inhibition of Dezincification of Brass

Wang Dihua, Zou Jinyun, Qiu Wanchuan, Yang Xinghe   

  1. Department of Environmental Science, Wuhan University, Wuhan 430072
  • Received:1996-12-08 Revised:1997-06-20 Published:1997-10-10 Online:1997-10-10

摘要: 抑制黄铜脱锌目前受到普遍重视. 抑制脱锌可在黄铜中添加微量合金元素(如 As、B等), 也可在介质中添加缓蚀剂, 如巯基或卤素取代醋酸、胺类、苯并三氮唑等[1, 2]. 然而, 对脱锌抑制作用的细节至今仍缺乏足够的了解. 研究表明, 锌的选择性溶解是导致黄铜脱锌的最基本过程, 且这一过程由锌原子的固相扩散所控制[3~5], 显然, 研究这一过程的抑制作用很有意义. 本文用计时电流法研究三苯基苄基溴化 (BPB)和苯并三氮唑(BTA)以及微量合金元素砷对黄铜中锌选择性溶解的抑制作用, 并根据固相扩散机制对这种抑制作用进行讨论和解释。

关键词: 黄铜脱锌, 抑制作用, 砷, 缓蚀剂

Abstract: The inhibition of dezincification of brass by benzyltriphenyl phosphonium bromide(BPB), benzotriazole(BTA)and traces of arsenic in the alloy was investigated by chronoamperometry and measurements of positron lifetime spectra in chloride solution. The results show that BPB and BTA in the solution and arsenic in the alloy can obviously decrease the transient diffusion current densities of zinc dissolution and reduce the diffusion coefficient of zinc in brass by the order of one to two. The results are interpreted in terms of the(di)vacancy diffusion mechanism.

Key words: brass dezincification, inhibition effect, arsenic, inhibitor