Microstructure and Corrosion Properties of Mg-<I>x</I>Sn-5Al-1Zn (<I>x</I>=0, 1, 5 and 9 mass%) Alloys

Abstract

In the present work, the corrosion properties of Mg-xSn-5Al-1Zn (x ¼ 0, 1, 5 and 9 mass%) alloys have been investigated. Potentiodynamic polarization and immersion tests were carried out in 3.5% NaCl solution of pH 7.2 at room temperature to measure the corrosion properties of Mg-xSn-5Al-1Zn (x ¼ 0, 1, 5, and 9 mass%) alloys. Microstrucral analysis shows the Mg 17 Al 12 and Mg 2 Sn phase were mainly precipitated along grain boundaries. With increase of the Sn contents, the volume fraction of the secondary phases, i.e. Mg 17 Al 12 and Mg 2 Sn phase, was increased. The corrosion resistance of Mg-xSn-5Al-1Zn alloys was improved by the Sn addition. Especially, the AZ51-5 mass%Sn alloy characterized the superior corrosion resistance in the studied alloys. It seems that the presence of Sn stabilized the Mg(OH) 2 layers on the surface of Mg alloys and the secondary phases effectively formed semi-continuous structures, resulting in a drastic improvement of corrosion resistance of the Mg alloys.

Effect of Microstructure Factors on Stress Corrosion Behavior of Mg<i>-x</i>Sn Alloys (<i>x</i> = 2, 5, 8 mass%)

“…Bowles et al 39) reveals that the addition of tin reduces the free corrosion potential in comparison to pure magnesium. Park et al 40) reported that the presence of Sn stabilized the Mg(OH) 2 layers and decreased anodic current density. However, the decreasing extent of pit density for SHT samples was slight.…”

Influence of Alloyed Ga on the Microstructure and Corrosion Properties of As-Cast Mg–5Sn Alloys

“…This infers that adding Sn potentially helps to enhance the mechanical integrity of the alloy at elevated temperatures [5,6,7,8,9]. On this account, the Mg–Sn-based alloy system is one of the most extensively studied alloys in recent years [6,7,8,9,10,11,12,13].…”

Effect of SiC Particle Size on Wear Properties of Al2O3·SiO2/SiC/Mg Hybrid Metal Matrix Composites

“…These goals represent a number of challenges that need to be addressed by both existing and next generation materials for the automotive industries. Magnesium (Mg) alloys and its composites are attractive candidates as alternative materials due to their high specific strength, which can lead to improved fuel efficiency and overall performance through weight reductions [1][2][3]. In particular, Mg-based metal matrix composites (MMCs) are proving to be attractive materials in terms of tribological and high-temperature applications for the construction of pistons, brake rotors, cylinder bores, and cylinder liners in automobiles due largely to their higher specific modulus, stiffness, and wear resistances [4,5].…”