【摘要】：某船用高純鋅犧牲陽極,未起到對傳熱管的保護作用。采用宏觀測試、組織分析及電化學(xué)性能測試等方法對犧牲陽極的失效原因進行了分析。結(jié)果表明:犧牲陽極表面有1~2mm厚的非金屬沉積物,主要為堿式氯化鋅,沉積物造成了犧牲陽極表面絕緣;犧牲陽極組織中有大量富鐵的析出相,與高純鋅標準嚴重不符;犧牲陽極在短時間運行后,發(fā)生自腐蝕,表面有附著物快速生成;陽極中鐵、銅及鉛等有害元素嚴重超標,形成了有害的第二相,使得犧牲陽極易產(chǎn)生自腐蝕,導(dǎo)致表面沉積物的形成。
[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.
【作者單位】： 海軍裝備部駐沈陽地區(qū)軍事代表局;鋼鐵研究總院;北京化工大學(xué)材料電化學(xué)過程與技術(shù)北京市重點實驗室;
【分類號】：U672.72

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