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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (3): 279-286    DOI: 10.11902/1005.4537.2014.024
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Influence of Yb Addition on Resistance to Exfoliation Corrosion of Aluminum Alloy 2519A
Bo JI1,Xinming ZHANG1(),Zhuofu ZHANG2,Lingying YE1,Wenjian LI3
1. School of Materials Science and Engineering, Central South University, Changsha 410083,China
2. Hunan Fugu Mechanical and Electrical Equipment Co., Ltd., Changsha 410100, China
3. China Nuclear Industry 23 Construction Co., Ltd., Yangjiang 529941, China
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Abstract  

Influence of Yb additions on resistance to exfoliation corrosion of aluminum alloy 2519A was investigated in EXCO solution at ambient temperature, while the alloys were characterized by means of hardness test, tensile test, optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that, with the addition of 0.2%Yb, the amount of the coarse phases AlCu phase and AlCuFeMn decreased in the alloy due to the formation of phases of Yb compounds with Al, Cu, Fe and Mn, of which the chemical activity was inferior to that of the phases AlCu and AlCuFeMn. Meantime, the Yb addition could also refine the θ ′ phase and increase its area fraction, as a result, the continuous precipitation of θ (Al2Cu) phase at grain boundaries could be prevented, and the width of the precipitation free zone (PFZ) was shrunken at grain boundaries,therefore the resistance to exfoliation corrosion of the alloy could be improved. However an excessive addition of Yb might deteriorate the mechanical properties and the resistance to exfoliation corrosion of the alloys.
Key words:  aluminum alloy 2519A      Yb      microstructure      exfoliation corrosion     
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Bo JI
Xinming ZHANG
Zhuofu ZHANG
Lingying YE
Wenjian LI

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Bo JI,Xinming ZHANG,Zhuofu ZHANG,Lingying YE,Wenjian LI. Influence of Yb Addition on Resistance to Exfoliation Corrosion of Aluminum Alloy 2519A. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 279-286.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.024     OR     https://www.jcscp.org/EN/Y2015/V35/I3/279

Alloy No. Cu Mg Mn Zr Ti Yb Al
1 5.8 0.2 0.3 0.2 0.05 0 Bal.
2 5.8 0.2 0.3 0.2 0.05 0.2 Bal.
3 5.8 0.2 0.3 0.2 0.05 0.4 Bal.
Table 1  Nominal compositions of the tested alloys
Fig.1  Vickers hardness curves of the present alloys aged at 165 ℃
Fig.2  Morphologies of the alloys with different contents of Yb after exfoliation corrosion for 6 h (a), 12 h (b), 24 h (c), 48 h (d) and 96 h (e)
Mass fraction of Yb / % Ultimate tensile strength σb / MPa Yield strength σ0.2 / MPa Elongation δ / %
Blank 483.4 437.6 13
0.2 509.3 460.3 14
0.4 467.9 425.9 12
Table 2  Tensile strength of the alloys with different Yb contents aged at 165 ℃
Time/h Alloy 1 Alloy 2 Alloy 3
6 EA- P EA
12 EB- EA+ EB
24 EB+ EB EC
48 EC- EB+ EC+
96 ED EC ED
Table 3  Ratings of exfoliation corrosion after immersioning in EXCO for different time
Fig.3  Cross-sections (a~c) and exfoliation products (d～f) of the alloys with 0% (a, d), 0.2% (b, e) and 0.4% (c, f) Yb after exfoliation corrosion test
Fig.4  SEM images of the alloys with 0% (a), 0.2% (b) and 0.4% (c) Yb after peak aging
Fig.5  EDS results of typical second-phase particles in the alloys with 0% (a), 0.2% (b) and 0.4% (c) Yb
Fig.6  Surface morphologies of the peak aged alloys with 0% (a), 0.2% (b) and 0.4% (c) Yb after exfoliation corrosion for 30 min
Position in Fig.5 Al Cu Yb Fe Mn
A 63.08 31.13 5.78 --- ---
B 73.37 18.72 6.21 --- 1.70
C 74.07 18.88 --- 5.30 1.57
D 63.71 12.89 2.55 0.37 0.17
  
Position in Fig.7 Al Cu Yb Fe Mn O
A 62.21 33.45 --- 3.46 0.88 ---
B 67.25 25.77 --- --- --- 6.97
C 72.54 23.23 2.91 0.22 1.10 ---
D 38.20 56.39 0.55 3.77 1.09 ---
E 81.47 18.53 --- --- --- ---
F 59.18 --- 0.47 3.80 1.38 ---
  
Fig.7  EDS results of typical second-phase particles in the peak aged alloys with 0% (a), 0.2% (b) and 0.4% (c) Yb after exfoliation corrosion for 30 min
Fig.8  TEM images of the grains (a~c) and grain boundaries (d~f) of the peak aged alloys containing 0% (a, d), 0.2% (b, e) and 0.4% (c, f) Yb
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