Effect of Ti on the Corrosion Behaviour of In Situ Mg2Si Particle Reinforced Al–12Si-20Mg-XTi Alloys
In this study, corrosion behaviour of Al–12Si-20Mg-XTi alloys (Ti content varied between 0 and 4 wt.%) was investigated. Characterizations of the alloys were carried out by microstructural examinations and corrosion tests. Microstructural results showed that precipitation of the Mg2Si phases was observed in Al-12Si-20Mg-XTi alloy matrix as two different morphologies; i.e. as a polyhedral primary particle and as a chinese script. Upon addition of Ti, Al3Ti intermetallic precipitated in the alloy. Corrosion tests were carried out by immersing the alloys in “30 g/l NaCl+10 ml/l HCl” solution. Evaluation of corrosion was determined by measuring weight loss for 24 hours and by potentiodynamic polarization tests. Corrosion resistance of the alloy was approximately constant with 1 wt % Ti addition whereas at higher additions, the corrosion rate increased.
Luís Guerra ROSA and Fernanda MARGARIDO
H. Ahlatci et al., "Effect of Ti on the Corrosion Behaviour of In Situ Mg2Si Particle Reinforced Al–12Si-20Mg-XTi Alloys", Materials Science Forum, Vols. 636-637, pp. 511-516, 2010