Effects of substituting ytterbium for scandium on corrosion behaviour of Al-Sc alloy

被引：12
|
作者：
Tuan, N. Q. [1 ]
Alves, A. C. [1 ]
Toptan, F. [1 ,2 ]
Lopes, A. B. [3 ]
Pinto, A. M. P. [1 ,2 ]
机构：
[1] Univ Minho, CMEMS UMinho Ctr MicroElect Mech Syst, P-4800058 Azurem, Guimaraes, Portugal
[2] Univ Minho, Dept Eng Mecan, P-4800058 Azurem, Guimaraes, Portugal
[3] Univ Aveiro, CICECO Dept Mat & Ceram Engn, P-3810193 Aveiro, Portugal
来源：
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2015年 / 66卷 / 12期
关键词：
3.5-PERCENT NACL SOLUTION; ELECTROCHEMICAL-BEHAVIOR; LOCALIZED CORROSION; ALUMINUM-ALLOYS; INTERMETALLIC PARTICLES; MG ALLOYS; MICROSTRUCTURE; ADDITIONS; IRON;
D O I：
10.1002/maco.201508360
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The localized corrosion and electrochemical behaviour of Al-0.28 wt.% Sc and Al-0.24 wt.% Sc-0.07 wt.% Yb alloys have been studied in 3.5 wt.% NaCl solution. The results showed that the impurity intermetallic phases containing Fe can act as cathodes and promote localized corrosion in the surrounding matrix. Yb had strong effect on the polarization behaviour in the anodic domain of Al-Sc alloy by improving the pitting corrosion resistance of this alloy. It has been deduced that a high number density of fully coherent nano-sized Al3Sc or Al-3(Sc, Yb) precipitates in heat treated alloys can enhance the passivation tendency of these alloys.
引用
收藏
页码：1504 / 1511
页数：8
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