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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
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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 wordsAl-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)
通讯作者: 蔡超     E-mail: caijingchao@126.com
Corresponding author: Chao CAI     E-mail: caijingchao@126.com
作者简介: 蔡 超,男,1978年生,教授,博士

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. Acta Metall Sin, 2019, 55(8): 958-966.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00519      或      https://www.ams.org.cn/CN/Y2019/V55/I8/958

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
Time / hDominating corrosion modeMax. IGC depth / μmMax. pitting depth / μm
0Pitting-120
2Local IGC140-
4General IGC238-
6General IGC221-
11.5Local IGC with pitting179101
22Local IGC with pitting134135
36Pitting with local IGC101192
45Pitting with local IGC72163
58Pitting with local IGC82151
68Pitting with slight IGC-199
72Pitting with slight IGC-227
98Pitting with slight IGC-167
120Pitting with slight IGC-181
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
Time / hDominating corrosion modeMax. IGC depth / μmMax. pitting depth / μm
0Pitting-125
1Pitting and local IGC60122
2Pitting and local IGC90120
4Pitting with local IGC115125
10Pitting-98
22Pitting-107
28Pitting-100
36Pitting-107
48Pitting-127
60Pitting-110
72Pitting-140
120Pitting-100
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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