J.M. Hu
,
H.M. Meng
,
D.B. Sun
,
S.J. Zhang
,
J.X. Wu and D.J. Yang Beijing Corrosion and Protection Center
,
Open Laboratory of Corrosion
,
Erosion and Surface Technology
,
University of Science and Technology Beijing
,
Beijing 100083
,
China
金属学报(英文版)
Service life of two different oxide anodes in phenolsulfonic acid (PSA) solution was investigated by accelerated electrolysis. The durability of Ti/IrO_2+Ta_2 O_5 anode increased by the addition of SnO_2 in the mixed oxides. The degradation mechanisms of Ti/IrO_2+ Ta_2 O_5 and Ti/IrO_2 +Ta_2 O_5 +SnO+2 anodes were different. It was shown from the observation of scanning electron microscopy (SEM) and the electrochcmical measurement that, the deactivation of Ti/IrO_2 + Ta_2 O_5 anode was due to the build-up of an organic film on surface. The growth of the covered film on surface was restricted by addition of SnO_2, which resulted in increasing of the service life of anodes. The over-potential for oxygen evolution on Ti/IrO_2 +Ta_2 O_5 electrode increased after doping SnO_2, and the intermediate products of PSA building-up on the surface was much more rapidly oxidized. Meanwhile, a certain part of the surface oxide deposit entered into the solution leading to loss of oxides, which resulted in degradation of Ti/IroO_2 + Ta_2 O_5 anode containing SnO_2 component.
关键词:
metal oxide anode
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null
,
null
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null
,
null
张胜健
,
杜爱玲
,
许立坤
,
辛永磊
稀有金属材料与工程
采用热分解法在钛基体上制备钌铱锡金属氧化物阳极,通过SEM、EDX、循环伏安、电化学阻抗谱及强化电解寿命试验等测试方法,探求不同海水温度对于钌铱锡金属氧化物阳极强化电解失效行为的影响规律.结果表明:在5～20℃海水温度条件下,阳极寿命短,失效阳极的中心区域存在少量残余涂层,呈现龟裂状形貌,而边缘地带Ti基体基本暴露,涂层发生局部电化学溶解或剥落;当海水电解温度为40℃时,阳极寿命较长,阳极涂层发生均匀电化学溶解.另外,随着海水温度的升高,阳极电化学活性表面积增大,稳定性逐渐提高.5～20℃条件下阳极失效主要是由于.Ru组元的选择性溶解和涂层局部剥落导致,而40℃条件下涂层也发生电化学溶解,但TiO2钝化膜的形成是引起阳极失效的主要原因.
关键词:
海水温度
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加速寿命
,
金属氧化物阳极
,
失效机理
黄永昌
腐蚀与防护
贵金属氧化物涂层钛阳极采用导电的贵金属氧化物（如RuO2、IrO2）作为催化剂，非导电的金属氧化物（如TiO2、Ta205、SnO2、ZrO2、CoOx等）作为分散剂或稳定剂，将它们涂复在阀门金属（Ti、Ta、Zr、Nb等）上通过热分解法制备而成。RuO2-TiO2/Ti阳极1968年在氯碱电解工业中获得成功应用，IrO2-Ta2O5/Ti阳极作为析氧电极近20年来得到更多关注，在电镀、阴极保护等众多领域获得了广泛的应用。本文重点介绍IrO2涂层钛阳极的成分、结构和电化学性能，并对其府用前景和存在问题讲行讨论。
关键词:
金属氧化物阳极
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氧的析出
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电化学过程
