Abstract
A case study of Siennicki Bridge stray current corrosion hazard is presented. A corrosion risk was caused by incorrectly designed tram line traction which goes over the bridge. No dielectric insulation between running rails and bridge steel construction was used. A variety of protection methods against stray currents are described. Characteristics of the endangered bridge were described. Impressed current cathodic protection system against stray currents was proposed and designed at the Department of Electrochemistry, Corrosion and Materials Engineering, Gdansk University of Technology. Coupon technique measurements and potential measurements were performed to verify the effectiveness of the protection system.
Highlights
Constructions made of metal and reinforced concrete are susceptible to corrosion hazards (Akiyama et al 2012; Ellingwood 2005)
Protection of metallic supporting construction of bridge against stray currents is possible with the impressed current cathodic protection
Corrosion protection system of Siennicki Bridge presented in this article is an example of such a case
Summary
Constructions made of metal and reinforced concrete are susceptible to corrosion hazards (Akiyama et al 2012; Ellingwood 2005). When cathodic protection is applied a corrosion reaction is hindered It is attained by decreasing the electrochemical potential of the protected construction with a direct current that flows from an anode through electrolytic environment to the surface of the protected metal (Bertolini et al 1998). Active methods are classified as cathodic protection methods Their purpose is to reduce or eliminate stray currents flow from the endangered construction to the electrolytic environment through the metal-electrolyte phase boundary. Such effect can be achieved by the application of the electrical drainage, cathodic protection with the impressed current source or by grounding electrodes through which the current can flow out of the construction.
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