<strong>2A97 Al-Li</strong>合金薄板时效析出与电位及晶间腐蚀的相关性研究

doi:10.11900/0412.1961.2018.00519

金属学报

2019, Vol. 55

Issue (8): 958-966 DOI: 10.11900/0412.1961.2018.00519

本期目录 | 过刊浏览

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

蔡超¹(

),李煬¹,李劲风²,张昭³,张鉴清³

1. 宁夏大学化学化工学院煤炭高效利用与绿色化工国家重点实验室银川 750021
2. 中南大学材料科学与工程学院长沙 410083
3. 浙江大学化学系杭州 310058

Correlation Between Ageing Precipitation, Potential and Intergranular Corrosion of 2A97 Al-Li Alloy Sheet

Chao CAI¹(

),Yang LI¹,Jinfeng LI²,Zhao ZHANG³,Jianqing ZHANG³

1. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China
3. Department of Chemistry, Zhejiang University, Hangzhou 310058, China

引用本文:

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.
Chao CAI, Yang LI, Jinfeng LI, Zhao ZHANG, Jianqing ZHANG. Correlation Between Ageing Precipitation, Potential and Intergranular Corrosion of 2A97 Al-Li Alloy Sheet[J]. Acta Metall Sin, 2019, 55(8): 958-966.

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摘要:

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。

关键词 ： Al-Li合金, 时效析出, 晶间腐蚀, 电位

Abstract：

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

收稿日期: 2018-11-16

ZTFLH:

TG113

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)

作者简介: 蔡超，男，1978年生，教授，博士

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图1 2A97 Al-Li合金T6时效不同时间并腐蚀后典型的纵截面腐蚀形貌

表1 2A97 Al-Li合金T6态时效不同时间并腐蚀后腐蚀类型和最大腐蚀深度

图2 2A97 Al-Li合金薄板T8时效不同时间并腐蚀后典型的纵截面腐蚀形貌

表2 A97Al-Li合金T8时效不同时间并腐蚀后腐蚀类型和最大腐蚀深度

图3 T6时效不同时间2A97 Al-Li合金薄板在3.5%NaCl溶液中的极化曲线

图4 T6和T8时效不同时间2A97 Al-Li合金薄板在3.5%NaCl溶液中的开路电位变化

图5 T6态时效不同时间后2A97 Al-Li合金显微组织的TEM像

图6 T8态时效不同时间后2A97 Al-Li合金显微组织的TEM像

图7 腐蚀类型与电位的相关性示意图

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