淬火速率对7020铝合金板材耐剥落腐蚀性能的影响

doi:10.11901/1005.3093.2017.464

材料研究学报

2018, Vol. 32

Issue (6): 423-431 DOI: 10.11901/1005.3093.2017.464

研究论文

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淬火速率对7020铝合金板材耐剥落腐蚀性能的影响

刘胜胆^1,^2,³, 郭琛^1,², 叶凌英^1,^2,³(

), 杨臻珅^1,², 邓运来^1,^2,³

1 中南大学材料科学与工程学院长沙 410083
2 中南大学有色金属材料科学与工程教育部重点实验室长沙 410083
3 中南大学有色金属先进结构材料与制造协同创新中心长沙 410083

Influence of Quench Rate on Exfoliation Corrosion Resistance of Rolled 7020 Al-alloy Plate

Shengdan LIU^1,^2,³, Chen GUO^1,², Lingying YE^1,^2,³(

), Zhenshen YANG^1,², Yunlai DENG^1,^2,³

1 School of Materials Science and Engineering, Central South University, Changsha 410083, China
2 Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, China
3 Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Changsha 410083, China

引用本文:

刘胜胆, 郭琛, 叶凌英, 杨臻珅, 邓运来. 淬火速率对7020铝合金板材耐剥落腐蚀性能的影响[J]. 材料研究学报, 2018, 32(6): 423-431.
Shengdan LIU, Chen GUO, Lingying YE, Zhenshen YANG, Yunlai DENG. Influence of Quench Rate on Exfoliation Corrosion Resistance of Rolled 7020 Al-alloy Plate[J]. Chinese Journal of Materials Research, 2018, 32(6): 423-431.

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摘要:

通过剥落腐蚀浸泡实验、电化学阻抗谱技术,并结合电子背散射衍射技术、扫描电镜以及扫描透射电镜等分析手段,研究了淬火速率对7020铝合金板材剥落腐蚀性能的影响。结果表明：淬火速率从1800℃/min下降到38℃/min时,合金耐剥落腐蚀性能降低,腐蚀等级由EA级变为EB+级,最大腐蚀深度从388 μm增加至570 μm。通过分析晶界析出相的数量、尺寸、间距及其化学成分和无沉淀析出带宽度的变化来探讨淬火速率对剥落腐蚀的影响机理。

关键词 ：金属材料, 7020铝合金, 淬火速率, 剥落腐蚀, 晶界析出相, 无沉淀析出带

Abstract：

The influence of quench rate after solution treatment on the exfoliation corrosion resistance of the rolled 7020 Al-alloy plate was studied by means of standard exfoliation corrosion immersion tests and electrochemical impedance spectroscope (EIS) technique, scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) technique and scanning transmission electron microscopy (STEM). Results showed that the exfoliation corrosion resistance of this alloy plate decreases with quench rate decreasing from 1800℃/min to 38℃/min. Correspondingly, the corrosion-ranking of the alloy degrades from EA to EB+, while the maximum corrosion depth increases from 388 μm to 570 μm. The relevant mechanism was discussed based on the effect of quench rate on the changes in the size, the number, the spacing and the microchemistry of grain boundary precipitates as well as the width of precipitate free zone.

Key words： metallic materials 7020 aluminum alloy quench rate exfoliation corrosion grain boundary precipitate precipitate free zone

收稿日期: 2017-07-30

ZTFLH:

TG146

基金资助:湖南省科技重大专项(2016GK1004),中南大学升华育英计划(20130603),国家重点研发计划(2016YFB0300901)

作者简介:

作者简介刘胜胆,男,1980年生,教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.464 或 https://www.cjmr.org/CN/Y2018/V32/I6/423

表1 实验所用7020铝合金化学成分

图1 7020铝合金在EXCO溶液中浸泡30 min后的扫描电镜照片

图2 7020铝合金在EXCO溶液中浸泡12 h和48 h后的腐蚀形貌

图3 7020铝合金剥落腐蚀后截面的金相照片

表2 等效电路的电化学参数值及其对应的最大剥落腐蚀深度

图4 不同淬火速率试样在EXCO溶液中的Nyquist曲线和等效电路图

图5 7020铝合金的取向成像图

图6 7020铝合金STEM照片

图7 7020铝合金STEM照片

图8 7020铝合金晶界析出相尺寸和间距以及无沉淀析出带宽度统计

图9 晶界析出相中Zn、Mg、Cu含量的变化

图10 7020铝合金剥落腐蚀扩展示意图

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