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http://dx.doi.org/10.14773/cst.2015.14.5.226

Effect of flow velocity on corrosion rate and corrosion protection current of marine material  

Lee, Seong Jong (Department of Power System Engineering, Kunsan National University)
Han, Min Su (Division of Marine Engineering, Mokpo National Maritime University)
Jang, Seok Ki (Division of Marine Engineering, Mokpo National Maritime University)
Kim, Seong Jong (Division of Marine Engineering, Mokpo National Maritime University)
Publication Information
Corrosion Science and Technology / v.14, no.5, 2015 , pp. 226-231 More about this Journal
Abstract
In spite of highly advanced paint coating techniques, corrosion damage of marine metal and alloys increase more and more due to inherent micro-cracks and porosities in coatings formed during the coating process. Furthermore, flowing seawater conditions promote the breakdown of the protective oxide of the materials introducing more oxygen into marine environments, leading to the acceleration of corrosion. Various corrosion protection methods are available to prevent steel from marine corrosion. Cathodic protection is one of the useful corrosion protection methods by which the potential of the corroded metal is intentionally lowered to an immune state having the advantage of providing additional protection barriers to steel exposed to aqueous corrosion or soil corrosion, in addition to the coating. In the present investigation, the effect of flow velocity was examined for the determination of the optimum corrosion protection current density in cathodic protection as well as the corrosion rate of the steel. It is demonstrated from the result that the material corrosion under dynamic flowing conditions seems more prone to corrosion than under static conditions.
Keywords
marine structure material; cathodic protection; flow velocity; corrosion rate;
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