کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1621894 | 1516398 | 2009 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Corrosion resistance and microstructure characterization of rare-earth-transition metal–aluminum–magnesium alloys Corrosion resistance and microstructure characterization of rare-earth-transition metal–aluminum–magnesium alloys](/preview/png/1621894.png)
This paper reports the results of investigation carried out to evaluate the corrosion resistance and microstructure of some cast alloys represented by the general formula: La0.7−xPrxMg0.3Al0.3Mn0.4Co0.5Ni3.8 (x = 0, 0.1, 0.3, 0.5, and 0.7). Scanning electron microscopy (SEM) and electrochemical methods, specifically, polarization curves and electrochemical impedance spectroscopy (EIS), have been employed in this study. The effects of Pr substitution on the composition of the various phases in the alloys and their corrosion resistance have been studied. The electrochemical results showed that the alloy without Pr and the one with total La substitution showed the highest corrosion resistance among the studied alloys. The corrosion resistance of the alloys decreased when Pr was present in the lowest concentrations (0.1 and 0.3), but for higher Pr concentrations (0.5 and 0.7), the corrosion resistance increased. Corrosion occurred preferentially in a Mg-rich phase.
Journal: Journal of Alloys and Compounds - Volume 479, Issues 1–2, 24 June 2009, Pages 342–347