해양환경 중 음극전류 프로세스에 의해 강판에 형성된 석회질 피막의 특성 분석

• Published in: Biuletyn Uniejowski Vol. 49; no. 2; pp. 166 - 171
• Main Authors: 박준무(Jun-Mu Park), 강재욱(Jae Wook Kang), 최인혜(In-Hye Choi), 이승효(Seung-Hyo Lee), 문경만(Kyung-Man Moon), 이명훈(Myeong-Hoon Lee)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 2016
• Subjects: 기계공학; Calcareous deposit films; Sacrificial anode; Current density; Cathodic current process
• ISSN: 1225-8024; 2299-8403; 2288-8403
• DOI: 10.5695/JKISE.2016.49.2.166

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.