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中国腐蚀与防护学报  2018, Vol. 38 Issue (5): 502-510    DOI: 10.11902/1005.4537.2017.178
  研究报告 本期目录 | 过刊浏览 |
2A02铝合金在模拟海洋大气环境中的剥蚀行为研究
曹敏1,2, 刘莉1(), 余钟芬3, 李瑛1, 王福会1,3
1 中国科学院金属研究所 沈阳 110016
2 中国科学院大学 北京 100049
3 东北大学材料科学与工程学院 材料各向异性与织构教育部重点实验室 沈阳 110819
Exfoliation Corrosion Behavior of 2A02 Al-alloy in a Simulated Marine Atmospheric Environment
Min CAO1,2, Li LIU1(), Zhongfen YU3, Ying LI1, Fuhui WANG1,3
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
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摘要: 

利用SEM,XPS,LSCM,TEM和EPMA等分析技术,探讨了2A02铝合金在60 ℃、72%RH和沉积4 mg/cm2 NaCl条件下的剥蚀行为。结果表明,2A02铝合金的剥蚀是从点蚀发展到晶间腐蚀,而后产生层状开裂与剥落。2A02铝合金内存在于晶界的第二相颗粒是初期发生点蚀的萌生位置,沿晶界快速扩散的Cl-是晶间腐蚀的促进因素。
关键词 ： 2A02,  铝合金,  NaCl沉积,  模拟海洋大气,  剥落腐蚀    
Abstract：

The exfoliation corrosion behavior of 2A02 Al-alloy plates in a simulated marine atmospheric environment was studied by means of weight loss measurement. Namely, the plates were covered with a deposit of 4 mg/cm2 solid NaCl and then tested at 60 ℃ in air with 72% humidity. The microstructure and corrosion products of the alloy were characterized by SEM, XPS, LSCM,TEM and EPMA etc. Results show that in the simulated marine atmospheric environment, the corrosion process of 2A02 Al-alloy experienced the following three successive stages, i.e. pitting corrosion, intergranular corrosion and exfoliation corrosion. It seems that the second phase particles, which situated at grain boundaries, may play a key role for the initiation of pitting corrosion, while the rapid diffusion of Cl- along grain boundaries may act as a promoting factor for intergranular corrosion.
Key words： 2A02 Al alloy    NaCl deposit    simulated marine atmosphere    exfoliation corrosion
收稿日期: 2017-11-02     
ZTFLH:  TG178  
基金资助:国家自然科学基金 (51622106)
作者简介:

作者简介 曹敏,女,1990年,博士生
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引用本文:

曹敏, 刘莉, 余钟芬, 李瑛, 王福会. 2A02铝合金在模拟海洋大气环境中的剥蚀行为研究[J]. 中国腐蚀与防护学报, 2018, 38(5): 502-510.
Min CAO, Li LIU, Zhongfen YU, Ying LI, Fuhui WANG. Exfoliation Corrosion Behavior of 2A02 Al-alloy in a Simulated Marine Atmospheric Environment. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 502-510.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.178      或      https://www.jcscp.org/CN/Y2018/V38/I5/502

图1  2A02铝合金板材沿轧制方向的金相形貌及其组织结构
图2  在60 ℃、沉积4 mg/cm2 NaCl、72%RH相对湿度环境中2A02 铝合金的腐蚀增重随时间的变化曲线
Position Content / % Na Mg Al Cl Cu
A Mass fraction --- 1.51 94.31 --- 4.18
Atomic fraction --- 1.73 96.46 --- 1.81
B Mass fraction --- 1.64 78.52 --- 19.84
Atomic fraction --- 2.05 88.46 --- 9.49
C Mass fraction 8.99 --- 74.46 2.44 14.11
Atomic fraction 11.36 --- 80.17 2.02 6.45
D Mass fraction 2.52 1.12 92.50 --- 3.86
Atomic fraction 3.01 1.26 94.06 --- 1.67
E Mass fraction 7.52 --- 90.21 2.27 ---
Atomic fraction 8.74 --- 89.55 1.71 ---
F Mass fraction 36.30 --- 18.62 45.08 ---
Atomic fraction 44.60 --- 19.49 35.92 ---
G Mass fraction 17.02 --- --- 82.98 ---
Atomic fraction 24.03 --- --- 75.97 ---
表1  2A02 铝合金在60 ℃、72%RH和沉积4 mg/cm2 NaCl环境中腐蚀不同时间的EDS分析结果
图3  2A02 铝合金在60 ℃、72%RH和沉积4 mg/cm2 NaCl环境中腐蚀不同时间的表面形貌
图4  2A02铝合金在60 ℃、72%RH和沉积4 mg/cm2 NaCl环境中腐蚀不同时间后的截面形貌
图5  2A02铝合金在60 ℃、72%RH和沉积盐4 mg/cm2环境中腐蚀不同时间且去除表面腐蚀产物后的表面微观形貌和相应的点蚀坑深度
图6  2A02铝合金在60 ℃、72%RH和沉积4 mg/cm2 NaCl环境中腐蚀200 h后的截面形貌
图7  2A02铝合金在60 ℃、72%RH和沉积4 mg/cm2 NaCl环境中腐蚀200 h后的截面EPMA图谱
Position Mg Al Si Cl Fe Ca
A 5.35 84.46 6.15 0 0 4.04
B 6.02 65.01 4.97 0.09 5.38 18.53
表2  图8c中A和B点的EDS分析结果
图8  2A02铝合金在60 ℃、72%RH和沉积4 mg/cm2 NaCl环境中腐蚀200 h且去除表面腐蚀产物后基体TEM形貌
图9  2A02铝合金在60 ℃、72%RH和沉积4 mg/cm2 NaCl环境中腐蚀200 h后粉末状腐蚀产物的XPS谱
Corrosion product ρ / kgm-3 V / cm3mol-1
Al 2.7×103 10
Al2O3 3.97×103 25.7
Al(OH)3 2.42×103 32.2
AlCl3 2.44×103 55.9
表3  各物质的密度和摩尔体积
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