2A97 Al-Li合金薄板时效析出与电位及晶间腐蚀的相关性研究
收稿日期: 2018-11-16
修回日期: 2019-03-13
网络出版日期: 2019-04-24
基金资助
国家自然科学基金项目(No.51741107);西部地区建设一流大学重大创新项目(No.ZKZD17003);宁夏回族自治区“化学工程与技术”国内一流学科建设项目(No.NXYLXK2017A04)
Correlation Between Ageing Precipitation, Potential and Intergranular Corrosion of 2A97 Al-Li Alloy Sheet
Received date: 2018-11-16
Revised date: 2019-03-13
Online published: 2019-04-24
Supported by
National Natural Science Foundation of China (No.51741107)(No.51741107);Major Innovation Projects for Building First-Class Universities in China's Western Region(No.ZKZD17003);National First-Class Discipline Construction Project of Ningxia(No.NXYLXK2017A04)
研究了2A97 Al-Li合金薄板不同时效后微观组织、电位及在晶间腐蚀(IGC)介质中的腐蚀特征。结果表明，随着时效时间延长，2A97 Al-Li合金中时效析出T1相等，导致合金电位下降，与之对应的合金腐蚀类型呈如下规律变化：孔蚀、晶间腐蚀(包括局部和全面晶间腐蚀)程度随时效时间延长呈先增加后降低的趋势。同时，相较T6态时效，T8态时效更加促进T1相的生成，而合金电位下降速度也更快。电位越低，晶间腐蚀程度越小，代之以大面积孔蚀程度越高。以上述研究为基础，建立了合金腐蚀类型与电位之间的相关性，对于不同时效处理时快速评价Al-Li合金的晶间腐蚀敏感性具有可行性。
蔡超 , 李煬 , 李劲风 , 张昭 , 张鉴清 . 2A97 Al-Li合金薄板时效析出与电位及晶间腐蚀的相关性研究[J]. 金属学报, 2019 , 55(8) : 958 -966 . DOI: 10.11900/0412.1961.2018.00519
The microstructures and open circuit potential (OCP) of 2A97 Al-Li alloy sheets with different ageing and their corrosion features in intergranular corrosion (IGC) medium were investigated. As the extension of ageing time, T1 (Al2CuLi) phases are precipitated, the alloy potential is decreased, which is accompanied with the following corrosion mode evolution: pitting, IGC (including local IGC and general IGC) and pitting again. Meanwhile, with ageing progress, the IGC depth is increased firstly and then decreased. Compared to T6 ageing, T8 ageing accelerates the precipitation of T1 phases, the potential therefore decreases more quickly. After a certain ageing, the lower the potential, the smaller the IGC degree, and the greater the pitting degree. A correlation between OCP and corrosion mode was proposed, which may be used to compare the IGC sensitivity of Al-Li alloy with different tempers.
Key words： Al-Li alloy; ageing precipitation; intergranular corrosion; potential
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