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中国腐蚀与防护学报  2015, Vol. 35 Issue (3): 279-286    DOI: 10.11902/1005.4537.2014.024
  研究报告 本期目录 | 过刊浏览 |
Yb对2519A铝合金抗剥落腐蚀性能的影响
暨波1,张新明1(),张卓夫2,叶凌英1,李文健3
2. 湖南河豚机电设备有限公司 长沙 410100
3. 中国核工业二三建设有限公司 阳江 529941
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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摘要: 

采用铸锭冶金法制备了不同Yb含量的2519A铝合金试样,通过硬度测试、力学性能测试、金相显微镜、扫描电镜与透射电镜等分析方法研究了稀土Yb对2519A铝合金抗剥落腐蚀性能的影响。结果表明：在2519A铝合金中添加0.2%Yb (质量分数) 时,Yb与Al,Cu,Fe和Mn形成稀土相,合金内粗大AlCu相和AlCuFeMn相数量减少,含Yb第二相粒子化学活泼性低于AlCu相和AlCuFeMn相。适量的Yb能细化合金的时效强化相,使其析出密度增加,阻止θ (Al2Cu) 相在晶界上连续析出,减小晶界无沉淀析出带 (PFZ) 宽度,使晶界析出相变成非连续分布,从而改善了合金的剥落腐蚀抗力。当Yb含量进一步增加时,合金力学性能及抗剥蚀性能下降。
关键词 ： 2519A铝合金,  Yb,  显微组织,  剥落腐蚀    
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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引用本文:

暨波,张新明,张卓夫,叶凌英,李文健. Yb对2519A铝合金抗剥落腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2015, 35(3): 279-286.
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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.024      或      https://www.jcscp.org/CN/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.
表1  实验合金的名义成分
图1  不同Yb含量的2519A铝合金在165 ℃下的时间-硬度曲线
图2  不同Yb含量合金的剥落腐蚀形貌
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
表2  不同Yb含量的2519A铝合金在165 ℃时效后的室温力学性能
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
表3  浸泡不同时间后合金的腐蚀等级评定
图3  不同Yb含量合金在腐蚀液中浸泡96 h后横截面剥蚀金相形貌及剥蚀产物情况
图4  不同Yb含量合金峰时效后的SEM像
图5  不同Yb含量合金内典型第二相粒子EDS分析
图6  不同Yb含量合金峰时效后在EXCO溶液中浸泡30 min后表面腐蚀形貌
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
表4  图5中典型第二相粒子EDS分析
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 ---
表5  图7中典型第二相粒子EDS分析
图7  不同Yb含量合金峰时效后在EXCO溶液中浸泡30 min后第二相粒子的EDS分析
图8  不同Yb含量合金在165 ℃峰时效后晶内和晶界的TEM像
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