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Vol.43, No.4, 318 ~ 329, 2005
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| Title |
| A Study on Corrosion Characteristics of Plasma Oxidized 65/35 Brass with Various Oxygen Pressure |
| 박창규 Chang Gyu Park , 안승호 Seung Ho Ahn , 김정구 Jung Gu Kim , 정윤모 Yun Mo Chung , 한전건 Jeon Gun Han |
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| Abstract |
| Brasses are the most widely used copper-based alloys because of the good corrosion resistance, formability, high strength and excellent hot-working properties. However, dezincification occurs when one or more components of an alloy are more susceptible to corrosion than the rest and, as a result, are preferentially dissolved. In order to enhance the corrosion resistance, the oxide film was deposited on the 65/35 brass by pulsed dc plasma oxidation with various pressure. The corrosion behavior of plasma oxidized brasses with various oxygen pressure was investigated by electrochemical methods (potentiodynamic polarization test, potentiostatic test, electrochemical impedance spectroscopy) and surface analyses (x-ray diffraction, scanning electron microscopy, auger electron spectroscopy, electron probe micro analyzer). Particular attention was paid to the effects of oxygen pressure and oxide thickness on the coating properties related to the corrosion behavior. From the results of electrochemical test, it was found that the oxidized brass under condition of 1.5 Torr oxygen pressure was effective in improving corrosion resistance. It was attributed to the protective oxidized layer (ZnO). Finally, an optimized oxidation condition for corrosion protection was found to be 1.5 Torr oxygen pressure and 1 pun thickness. (Received September 3, 2004) |
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| Key Words |
| Plasma oxidized brass, XRD, SEM, EPMA, Corrosion test, Dezincification |
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