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http://dx.doi.org/10.5695/JKISE.2016.49.2.166

The Characteristic Analysis of Calcareous Deposit Films Formed on Steel Plate by Cathodic Current Process in Marine Environment  

Park, Jun-Mu (Division of Marine Engineering, Korea Maritime and Ocean University)
Kang, Jae Wook (Dept. of Marine Equipment Engineering, Korea Maritime and Ocean University)
Choi, In-Hye (Division of Marine Engineering, Korea Maritime and Ocean University)
Lee, Seung-Hyo (Division of Marine Engineering, Korea Maritime and Ocean University)
Moon, Kyung-Man (Dept. of Marine Equipment Engineering, Korea Maritime and Ocean University)
Lee, Myeong-Hoon (Division of Marine Engineering, Korea Maritime and Ocean University)
Publication Information
Journal of the Korean institute of surface engineering / v.49, no.2, 2016 , pp. 166-171 More about this Journal
Abstract
Cathodic protection is widely recognized as the most cost effective and technically appropriate corrosion prevention methodology for the port, offshore structures, ships. When applying the cathodic protection method to metal facilities in seawater, on the surface of the metal facilities a compound of calcium carbonate($CaCO_3$) or magnesium hydroxide($Mg(OH)_2$) films are formed by $Ca^{2+}$ and $Mg^{2+}$ ions among the many ionic components dissolving in the seawater. And calcareous deposit films such as $CaCO_3$ and $Mg(OH)_2$ etc. are formed by the surface of the steel product. These calcareous deposit film functions as a barrier against the corrosive environment, leading to a decrease in current demand. On the other hand, the general calcareous deposit film is a compound like ceramics. Therefore, there may be some problems such as weaker adhesive power and the longer time of film formation uniting with the base metal. In this study, we tried to determine and control the optimal condition through applying the principle of cathodic current process to form calcareous deposit film of uniform and compact on steel plate. The quantity of precipitates was analyzed, and both the morphology, component and crystal structure were analyzed as well through SEM, EDS and XRD. And based on the previous analysis, it was elucidated mechanism of calcareous deposit film formed in the sacrificial anode type (Al, Zn) and current density (1, 3, $5A/m^2$) conditions. In addition, the taping test was performed to evaluate the adhesion.
Keywords
Cathodic current process; Calcareous deposit films; Current density; Sacrificial anode;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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