Discussing countermeasures against metal stray current corrosion
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Sources of stray current include trams, power generation equipment, electrolyzers, and cathodic protection equipment. The underground structures that are affected include pipelines, cables, as well as metal equipment that is buried or semi-buried underground. When designing underground structures, it is necessary to investigate whether there are any sources of stray current in the vicinity. If such sources exist, appropriate measures should be taken, such as insulating the underground structure with plastic or coatings, or using drainage methods to connect the structure directly or through a rectifier to a negative power supply, thereby making the structure cathodic (cathodic protection).
To prevent corrosion caused by metal stray currents, the following measures can be taken: First, conduct a survey of the surrounding environment during the design phase to identify potential sources of stray currents. Secondly, the underground structure can be provided with insulation protection, such as by using plastic coating or applying anti-corrosion paint. Furthermore, the drainage method can also be employed; by connecting a rectifier to the negative feed line, cathodic protection can be provided for the structure, thereby effectively preventing corrosion caused by stray currents. These methods can be applied selectively to develop the most appropriate protection strategy based on specific circumstances. .