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Vol.36, No.12, 2173 ~ 2182, 1998

Title

Corrosion Properties of Squeeze Cast Mg-5wt%Al alloy containing Zirconium

박진영 , 박주현 , 홍준표 , 김도향 , 박익민 Jin Young Park , Joo Hyun Park , Chun Pyo Hong , Do Hyang Kim , Ik Min Park

Abstract

The effects of Zr addition and heat treatment on the corrosion properties of the squeeze cast Mg-5wt%Al alloy have been investigated by potentiodynamic polarization test, impedance measurement and immersion test in deaerated 3.5wt%NaCl solution. Mg-5wt%A1-0.6wt%Zr alloy was solution heat-treated at 415℃ for 24hrs and then artificially aged at 220℃ for 55hrs (T6). The results show that the Zr addition in the squeeze cast Mg-5wt%Al alloy increases the corrosion resistance mainly due to the grain refinement and uniform distribution of Mg_(17)Al_(12) phases. Heat treatment affects greatly the microstructures and corrosion properties of Mg-5wt%Al-0.6wt%Zr alloy. The corrosion resistance of Mg-5wt%Al-0.6wt%Zr alloy decreases in the order, T6, as-cast, solution heat-treated condition. The superior corrosion resistance in T6 heat-treated condition is considered to be due to the effective pit propagation barrier behavior of Mg_(17)Al_(12) discontinuous precipitates.

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