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本文对埋设在北海淤泥中的地下管线所联接锌阳极的破裂原因进行了调查。在输送60和95℃油的输油管线的阳极的两起失效,显然是由于晶间腐蚀引起的。在模拟埋设管线的锌、铝阳极所处的条件下,在大约80℃下(大致代表了埋设阳极的温度)进行为期三周到90天的实验室试验,旨在对锌阳极进行一些分析研究,试验环境包括淤泥和海水,分别取电流密度为0.07～0.7毫安/厘米~2。Zn-Mg和Zn-cd表面呈海綿状并产生麻坑状腐蚀,因而被认为是不符合要求的。符合MiL-A-18001H的锌阳极有轻微的1G侵蚀。在其它影响中,由于温度而致的主要是使Al-Zn-In阳极的电容量下降到为正常值的18～24％。本文还讨论了合金化元素、压力、电流密度,锌在60℃时极性反向的可能性,以及其它的一些次要因素。
In this paper, the cause of rupture of the zinc anode connected to the underground pipeline buried in the mud in the North Sea was investigated. Both failures at the anode of the oil pipeline carrying 60 and 95 ° C oil are apparently due to intergranular corrosion. A laboratory experiment of three to 90 days at about 80 ° C (roughly representing the temperature at which the anode is buried) was conducted under simulated zinc and aluminum anodes for buried pipelines to conduct some analytical studies on the zinc anode, The test environment consisted of silt and seawater, respectively, at a current density of 0.07-0.7 mA / cm 2. Zn-Mg and Zn-cd surface sponge-like and produce pit-like corrosion, which is considered not to meet the requirements. The zinc anodes that meet MiL-A-18001H have a slight 1G erosion. Among other effects, the temperature-induced decrease in the capacity of the Al-Zn-In anode is mainly 18 to 24% of the normal value. The article also discusses the alloying elements, pressure, current density, the possibility of reverse polarity of zinc at 60 ° C, and other minor factors.