船用设备牺牲阳极的失效原因

发布时间：2018-10-18 06:32

【摘要】：某船用高纯锌牺牲阳极,未起到对传热管的保护作用。采用宏观测试、组织分析及电化学性能测试等方法对牺牲阳极的失效原因进行了分析。结果表明:牺牲阳极表面有1~2mm厚的非金属沉积物,主要为碱式氯化锌,沉积物造成了牺牲阳极表面绝缘;牺牲阳极组织中有大量富铁的析出相,与高纯锌标准严重不符;牺牲阳极在短时间运行后,发生自腐蚀,表面有附着物快速生成;阳极中铁、铜及铅等有害元素严重超标,形成了有害的第二相,使得牺牲阳极易产生自腐蚀,导致表面沉积物的形成。
[Abstract]:A marine high-purity zinc sacrificial anode did not protect the heat transfer pipe. The failure reasons of sacrificial anode were analyzed by macroscopical test, microstructure analysis and electrochemical performance test. The results show that the surface of the sacrificial anode contains 1~2mm thick non-metallic deposits, mainly basic zinc chloride, which results in the surface insulation of the sacrificial anode, and there are a large number of Fe-rich precipitated phases in the sacrificial anode structure, which are seriously inconsistent with the high purity zinc standard. After the sacrificial anode was operated for a short time, self-corrosion occurred, and the surface of the sacrificial anode was rapidly formed. The harmful elements such as iron, copper, lead and other harmful elements in the anode exceeded the standard seriously, forming a harmful second phase, which made the sacrificial anode prone to self-corrosion. The formation of surface sediments.
【作者单位】：海军装备部驻沈阳地区军事代表局;钢铁研究总院;北京化工大学材料电化学过程与技术北京市重点实验室;
【分类号】：U672.72

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