적층가공 방식으로 제조된 CP-Ti의 캐비테이션 중 부식에 대한 전기화학적 접근
Electrochemical Approach on the Corrosion During the Cavitation of Additive Manufactured Commercially Pure Titanium
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The effect of passive film on corrosion of metals and alloys in a static corrosive environment hasbeen studied by many researchers and is well known, however few studies have been conducted onthe electrochemical measurement of metals and alloys during cavitation corrosion conditions, and thereare no test standards for electrochemical measurements ‘During cavitation’ conditions. This study usedcommercially additive manufactured(AM) pure titanium in tests of anodic polarization, corrosion potentialmeasurements, AC impedance measurements, and repassivation. Tests were performed in 3.5% NaClsolution under three conditions, ‘No cavitation’, ‘After cavitation’, and ‘During cavitation’ condition. When cavitation corrosion occurred, the passive current density was greatly increased, the corrosionpotential largely lowered, and the passive film revealed a small polarization resistance. The currentfluctuation by the passivation and repassivation phenomena was measured first, and this behavior wasrepeatedly generated at a very high speed. The electrochemical corrosion mechanism that occurredduring cavitation corrosion was based on result of the electrochemical properties ‘No cavitation’, ‘Aftercavitation’, and ‘During cavitation’ conditions.
Abstract
The effect of passive film on corrosion of metals and alloys in a static corrosive environment hasbeen studied by many researchers and is well known, however few studies have been conducted onthe electrochemical measurement of metals and alloys during cavitation corrosion conditions, and thereare no test standards for electrochemical measurements ‘During cavitation’ conditions. This study usedcommercially additive manufactured(AM) pure titanium in tests of anodic polarization, corrosion potentialmeasurements, AC impedance measurements, and repassivation. Tests were performed in 3.5% NaClsolution under three conditions, ‘No cavitation’, ‘After cavitation’, and ‘During cavitation’ condition. When cavitation corrosion occurred, the passive current density was greatly increased, the corrosionpotential largely lowered, and the passive film revealed a small polarization resistance. The currentfluctuation by the passivation and repassivation phenomena was measured first, and this behavior wasrepeatedly generated at a very high speed. The electrochemical corrosion mechanism that occurredduring cavitation corrosion was based on result of the electrochemical properties ‘No cavitation’, ‘Aftercavitation’, and ‘During cavitation’ conditions.
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