Mg 합금의 PEO 공정 조건에 따른 산화피막 결정상과 내부식성에 대한 연구 II. 내부식성
Corelation between crystalline phase and corrosion resistance of Mg alloy with different PEO conditions. II. Corrosion resistance
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초록
AZ31과 AZ91 Mg 합금을 Na-P 및 Na-Si 전해질을 사용하여 전해질의 농도, 인가전압, 처리시간에 따라 여러 가지 조건에서 PEO 처리하여 5%의 농도를 갖는 염수분무법으로 내부식성 연구를 하였다. 일반적으로 산화피막 코팅 두께 가 증가하면 내부식성이 증가하였다. 코팅두께보다 산화피막 표면의 기공크기가 커지면 장기 내부식성은 나빠지는 경향을 보인다. 산화피막의 전체적인 산화물 결정상이 증가할수록, 또 MgO 결정상 대신 Mg 2 SiO 4 상과 같은 다른 결정상이 증가할수록 내부식성이 월등히 증가하는 것을 알 수 있었다.
Abstract
Mg alloys AZ31 and AZ91 were Plasma-Electrolytic-Oxidized in Na-P and Na-Si system electrolyte at various concentration, applied voltage and time. Thickness and surface roughness of PEO coating were examined. Salt spraying test were carried out to compare their corrosion resistances. Generally, corrosion resistances rate were increased as thickness and crystallinity increasing. Size of pore being larger, long term corrosion resistance decreased. It is turned out that Mg 2 SiO 4 and other crystalline phase rather than MgO might be increase corrosion resistance dramatically.
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