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中国腐蚀与防护学报  2017, Vol. 37 Issue (3): 287-292    DOI: 10.11902/1005.4537.2016.025
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不同时效态7050铝合金板材腐蚀速率测量
宋丰轩1(),赵启忠1,李飞龙1,任月路1,黄奎1,张新明1,2
1 广西南南铝加工有限公司 南宁 530031
2 中南大学材料科学与工程学院 长沙 410083
Effect of Aging Treatment on Corrosion Rate of 7050 Al-alloy Plate
Fengxuan SONG1(),Qizhong ZHAO1,Feilong LI1,Yuelu REN1,Kui HUANG1,Xinming ZHANG1,2
1 Guangxi Alnan Aluminum Inc., Nanning 530031, China
2 School of Materials Science and Engineering, Central South University, Changsha 410083, China
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摘要 

采用失重、动电位极化和裂纹扩展速率测试方法,对不同时效态7050铝合金板材的腐蚀速率进行测定,并利用金相显微镜对浸蚀表面和纵截面的腐蚀形貌进行观察。结果表明:随着时效程度的增加,合金腐蚀类型由局部腐蚀逐渐向均匀腐蚀转变,腐蚀速率逐渐增加;而腐蚀裂纹扩展方式由沿晶腐蚀逐渐向穿晶腐蚀转变,导致腐蚀裂纹扩展速率不断减小;峰值时效态合金的腐蚀电流密度最大,欠时效态的次之,过时效态的最小。

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宋丰轩
赵启忠
李飞龙
任月路
黄奎
张新明
关键词:  7050铝合金板  腐蚀速率  动电位极化  腐蚀裂纹  时效    
Abstract: 

Three groups of the same 7050 Al-alloy plates were all aged firstly at 121 ℃ for 6 h and then aged subsequently at 163 ℃ for 0, 12 and 24 h respectively. The corrosion performance of the aging treated alloy plates was characterized by means of mass loss measurement, potentiodynamic polarization curve measurement and corrosion cracking propagation measurement, as well as optical microscope (OM). The results show that the corrosion type of the aged alloy plates changed from localized corrosion to general corrosion gradually with increasing ageing time and the corrosion rate decreased constantly. Meanwhile, the manner of corrosion cracking propagation for the aged alloys transformed from intergranular to transgranular gradually with the increasing ageing time. This makes the rate of corrosion cracking propagation become lower continuously. The corrosion current density for the different aged alloy plates were assessed by potentiodynamic polarization technique, which may be ranked as the following order: peak-aged state >under-aged state > over-aged state.

Key words:  7050 aluminum alloy plate    corrosion rate    potentiodynamic polarization    corrosion cracking    aging
收稿日期:  2016-02-22                出版日期:  2017-07-04      发布日期:  2017-07-04      期的出版日期:  2017-07-04
基金资助: 国家国际科技合作专项 (2014DFA50210)
引用本文:    
宋丰轩,赵启忠,李飞龙,任月路,黄奎,张新明. 不同时效态7050铝合金板材腐蚀速率测量[J]. 中国腐蚀与防护学报, 2017, 37(3): 287-292.
Fengxuan SONG,Qizhong ZHAO,Feilong LI,Yuelu REN,Kui HUANG,Xinming ZHANG. Effect of Aging Treatment on Corrosion Rate of 7050 Al-alloy Plate. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 287-292.
链接本文:  
http://www.jcscp.org/CN/10.11902/1005.4537.2016.025  或          http://www.jcscp.org/CN/Y2017/V37/I3/287
图1  7050铝合金不同时效态样品失重量和失重速率测量结果
图2  不同时效态7050铝合金样品的极化曲线和腐蚀速率
图3  7050铝合金纵截面最大腐蚀深度和平均腐蚀深度随浸泡时间的变化
图4  7050铝合金在3.5%NaCl溶液中浸泡12 h后的表面和纵截面腐蚀形貌
图5  合金晶界附近电势分布随时效程度的变化示意图 (灰度越高,电势越负)
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