摘要
研究了含Ga、Sn的高活性铝合金阳极的电化学性能。发现这种铝合金阳极一旦活化 ,其表面膜被破坏 ,就会与水反应剧烈 ,造成大量析氢。而在中性电解液中添加的微量KMnO4 ,虽然未改变铝合金阳极溶解时析氢的“负差效应”规律 ,却对铝合金阳极析氢有明显抑制作用。在铝合金阳极表面还原生成一层含MnO2 和Al2 O3 的褐色阻化膜 ,这层膜阻碍了基体铝与中间价态的Al+(ad) 与水的直接反应 ,并且阻碍了金属铝微粒脱落 ,减少其在溶液中与水的反应。同时 ,由于表面膜能抑制非成流反应的进行 ,还降低了阳极极化。
The electrochemical performance of Al-alloy-anode with high active elements and Ga, Sn contents was investigated. When the Al-alloy-anode was activated, the passive oxide film was broken, the anode reacted rapidly with H 2O and released a vast amount of hydrogen. The hydrogen release was inhibited when trace KMnO 4 was added to the nutral solution, although the negative difference effect wasnt changed. The film with MnO 2 and Al 2O 3 on aluminum surface prevented the bare part of aluminum and the intermedia ion Al + ad reacting directly with H 2O, as well as the small pieces of aluminum splitting away from the electrode and corroding freely in the solution. And, the anodic polarization decreased for the film inhibited by reaction.
出处
《电源技术》
CAS
CSCD
北大核心
2000年第6期359-362,共4页
Chinese Journal of Power Sources
关键词
铝合金阳极
阻化剂
高猛酸钾
电池
Al-alloy-anode
inhibition
negative difference effec