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http://dx.doi.org/10.5916/jkosme.2015.39.7.779

Properties analysis of environment friendly calcareous deposit films electrodeposited at various temperature conditions in natural seawater  

Lee, Chan-Sik (Korean Register of Shipping)
Kang, Jun (Division of Marine System Engineering, Korea Maritime and Ocean University)
Lee, Myeong-Hoon (Division of Marine System Engineering, Korea Maritime and Ocean University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.39, no.7, 2015 , pp. 779-785 More about this Journal
Abstract
Cathodic protection is recognized as the most cost-effective and technically appropriate corrosion prevention method for the submerged zone of offshore structures, ships, and deep-sea facilities. When cathodic protection is applied, the cathodic currents cause dissolved oxygen reduction, generating hydroxyl ions near the polarized surface that increase the interfacial pH and result in enhanced carbonate ion concentration and precipitation of an inorganic layer whose principal component is calcium carbonate. Depending on the potential, magnesium hydroxide can also precipitate. This mixed deposit is generally called "calcareous deposit." This layer functions as a barrier against the corrosive environment, leading to a decrease in current demand. Hence, the importance of calcareous deposits for the effective, efficient operation of marine cathodic protection systems is recognized by engineers and scientists concerned with cathodic protection in submerged marine environments. Calcareous deposit formation on a marine structure depends on the potential, current, pH, temperature, pressure, sea-water chemistry, flow, and time; deposit quality is significantly influenced by these factors. This study determines how calcareous deposits form in sea water, and assesses the interrelationship of formation conditions (such as the sea water temperature and surface condition of steel), deposited structure, and properties and the effectiveness of the cathodic protection.
Keywords
Cathodic protection; Calcareous deposit; $Mg(OH)_2$; $CaCO_3$;
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Times Cited By KSCI : 1  (Citation Analysis)
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