오스테나이트 스테인리스강의 해수에서 전기화학적 특성에 미치는 전해연마시간의 영향
Effect of electropolishing process time on electrochemical characteristics in seawater for austenitic stainless steel
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Electropolishing is a surface finishing treatment that compensates for the disadvantages of themechanical polishing process. It not only has a smooth surface, but also improves corrosion resistance. Therefore, the purpose of this investigation is to examine the corrosion resistance and electrochemicalcharacteristics in seawater of UNS S31603 with electropolishing process time. The roughnessimprovement rate after electropolishing was improved by about 78% compared to before polishing,indicating that the electropolishing is effective. As a result of potential measuring of mechanicalpolishing and electropolishing, the potential of electropolishing was nobler than the mechanicalpolishing condition. As a result of calculating the corrosion current density after potentiodynamicpolarization experiment with electropolishing conditions, the corrosion current density of mechanicalpolishing was about 6.4 times higher than that of electropolishing. After potentiodynamic polarizationexperiment with electropolishing conditions, the maximum damage depth of mechanical polishingwas about 2.2 times higher than that of electropolishing(7 minutes). In addition, the charge transferresistance of the specimen electropolished for 7 minutes was the highest, indicating improvedcorrosion resistance.
Abstract
Electropolishing is a surface finishing treatment that compensates for the disadvantages of themechanical polishing process. It not only has a smooth surface, but also improves corrosion resistance. Therefore, the purpose of this investigation is to examine the corrosion resistance and electrochemicalcharacteristics in seawater of UNS S31603 with electropolishing process time. The roughnessimprovement rate after electropolishing was improved by about 78% compared to before polishing,indicating that the electropolishing is effective. As a result of potential measuring of mechanicalpolishing and electropolishing, the potential of electropolishing was nobler than the mechanicalpolishing condition. As a result of calculating the corrosion current density after potentiodynamicpolarization experiment with electropolishing conditions, the corrosion current density of mechanicalpolishing was about 6.4 times higher than that of electropolishing. After potentiodynamic polarizationexperiment with electropolishing conditions, the maximum damage depth of mechanical polishingwas about 2.2 times higher than that of electropolishing(7 minutes). In addition, the charge transferresistance of the specimen electropolished for 7 minutes was the highest, indicating improvedcorrosion resistance.
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