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首页> 外文期刊>Protection of Metals >About Corrosion Macrocells Formed on Underground Pipelines at the Switched off Cathodic Protection
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About Corrosion Macrocells Formed on Underground Pipelines at the Switched off Cathodic Protection

机译：关于关闭的阴极保护处地下管道上形成的腐蚀宏电池

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Experimental modeling in grounds showed that during the pauses in cathodic protection, dangerous corrosion macrocells, suppressed by the cathodic polarization, may regenerate and some new macrocells may originate due to the cathodically induced passivation of steel at some parts of a pipeline. The transformation of an active cathode into a passive one in a cell formed because of the difference in the types of ground slightly affects the degree of its danger estimated from the dissolution rate of the anode and results in completely ceasing the local corrosion of the cathode. The cells which form (during pauses in the cathodic protection) due to the difference in the protective potentials along the pipeline, i.e., from -1.1 to -0.85 V within the protection zone, are not dangerous, because the more negative the polarization potential, the higher the degree of the cathodically induced passivity of the metal. The less passivated electrode soon becomes an anode in such a cell; in a week it may become active and the cell may transform into a dangerous one if the cathode is still passive.
机译：在地面进行的实验模型表明，在阴极保护暂停期间，受到阴极极化抑制的危险腐蚀宏单元可能会再生，并且由于管道某些部分的钢在阴极上引起的钝化而可能会产生一些新的宏单元。由于接地类型的不同，在形成的电池中，将活性阴极转变为无源阴极会稍微影响根据阳极溶解速率估算的危险程度，并会完全消除阴极的局部腐蚀。由于沿管道的保护电位不同（即保护区内的-1.1至-0.85 V）而形成的（在阴极保护暂停期间）形成的电池并不危险，因为极化电位越负，金属的阴极感应钝化程度越高。钝化程度较低的电极很快成为此类电池中的阳极。在一个星期内，如果阴极仍然是被动的，它可能会变得活跃，并且电池可能会变成危险的电池。

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