کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1469930 | 1510040 | 2012 | 12 صفحه PDF | دانلود رایگان |
The corrosion performance of AM50 and AZ91D alloys containing up to 1.5 wt.% Nd was investigated by electrochemical and gravimetric measurements in 3.5 wt.% NaCl at 22 °C. The alloys were characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD) and surface potential maps. In Nd-containing alloys, formation of Al2Nd and Al–Mn–Nd intermetallic compounds reduced the volume fraction and modified the morphology of the β-Mg17Al12 phase. The addition of Nd improved the corrosion resistance of the alloys due to increased passivity of the surface film and suppression of micro-galvanic couples.
► Nd addition modified the microstructure of AM50 and AZ91D magnesium alloys.
► Volume of β-Mg17Al12 phase was reduced and Al2Nd/Al–Mn–Nd particles were formed.
► Nd-containing intermetallics revealed lower potential than Al–Mn inclusions.
► 0.7–0.8 wt.% Nd reduced the corrosion rate of AM50 and AZ91D alloys by 90%.
Journal: Corrosion Science - Volume 55, February 2012, Pages 301–312