Electrolytic corrosion of water pipeline system in the remote distance from stray currents—Case study

Case Studies in Construction Materials

Jacek Banas​¹  Agata Jazdzewska​²  Juliusz Orlikowski​²  Krzysztof Zakowski​²  Kazimierz Darowicki​²  Stefan Krakowiak​²  Maciej Gruszka³ 

[1] AGH University of Science and Technology, Reymonta 23, 30-059 Krakow, Poland;Department of Electrochemistry, Corrosion and Materials Engineering, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland;MPWIK S.A.(Municipal Waterworks in Cracow), Senatorska 1, 30-106 Krakow, Poland;

关键词: Water pipeline;    Stray currents;    Stray-current corrosion;    Electrolytic corrosion;    Cathodic protection;    Galvanic anode;    Corrosion diagnosis;   

DOI  :  10.1016/j.cscm.2016.03.002

来源: DOAJ

【 摘 要 】

Case study of corrosion failure of urban water supply system caused by the harmful effects of stray currents was presented. The failure occurred at a site distant from the sources of these currents namely the tramway and railway traction systems. Diagnosis revealed the stray currents flow to pipeline over a remote distance of 800/1000 m from the point of failure. At the point of failure stray currents flowed from the pipeline to the ground through external insulation defects, causing the process of electrolytic corrosion of the metal. Long distance between the affected section of the pipeline and the sources of stray currents excludes the typical protection against stray currents in the form of electrical polarized drainage. Corrosion protection at this point can be achieved by using the earthing electrodes made of magnesium, which will also provide cathodic current protection as galvanic anode.

【 授权许可】

Unknown