电弧增材制造航空AA2024铝合金的微观结构及其腐蚀行为研究

doi:10.11902/1005.4537.2021.149

中国腐蚀与防护学报

2022, Vol. 42

Issue (4): 621-628 DOI: 10.11902/1005.4537.2021.149

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电弧增材制造航空AA2024铝合金的微观结构及其腐蚀行为研究

赵海洋¹^,², 高多龙¹^,², 张童³, 吕由³, 张宇鹏³, 张欣欣³(

), 石鑫¹^,², 魏晓静¹^,², 刘冬梅¹^,², 董泽华³

^1.中国石油化工股份有限公司西北油田分公司乌鲁木齐 830011
^2.中国石化缝洞型油藏提高采收率重点实验室乌鲁木齐 830011
^3.华中科技大学化学与化工学院武汉 430074

Microstructure and Corrosion Evolution of Aerospace AA2024 Al-Alloy Thin Wall Structure Produced Through WAAM

ZHAO Haiyang¹^,², GAO Duolong¹^,², ZHANG Tong³, LV You³, ZHANG Yupeng³, ZHANG Xinxin³(

), SHI Xin¹^,², WEI Xiaojing¹^,², LIU Dongmei¹^,², DONG Zehua³

^1.SINOPEC Northwest Company of China Petroleum and Chemical Corporation, Urumqi 830011, China
^2.Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs, SINOPEC, Urumqi 830011, China
^3.School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

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摘要:

研究了电弧增材制造 (WAAM) 航空AA2024铝合金的微观组织结构及其腐蚀行为。通过扫描电镜 (SEM)、透射电镜 (TEM) 和能量色散X射线光谱仪 (EDX),研究了该铝合金腐蚀前后的微观组织结构以阐明其腐蚀行为。结果表明,电弧增材制造AA2024铝合金中,存在熔池区 (MPZ)、熔池边界区 (MPB) 和热影响区 (HAZ)。3个区域中均存在以孤立或成簇的形式存在的S相 (Al₂CuMg)、θ相 (Al₂Cu) 和α相 (AlFeMnSi) 金属间化合物 (IM)。相对MPZ和HAZ,MPB显示出更高的局部腐蚀敏感性,这与IM的脱合金化行为密切相关。

关键词 ：金属间化合物, 增材制造, 脱合金化, AA2024铝合金, 局部腐蚀

Abstract：

The microstructure and corrosion behaviour of the wire arc additive manufactured (WAAM) thin wall structure of AA2024 Al-alloy are investigated by means of scanning electron microscope (SEM), transmission electron microscope (TEM) and energy dispersive X-ray spectrometer (EDX), as well as immersion test in 3.5%NaCl solution. Three distinctive areas, including melt pool zone (MPZ), melt pool border (MPB) and heat affected zone (HAZ), were formed in the WAAM structure. S-phase, θ-phase and α-phase are present in all three zones, which could exist individually or in cluster. Localized corrosion tends to initiate at MPB rather than HAZ and MPZ, which is closely associated with the de-alloying behaviour of intermetallic (IM) particles.

Key words： intermetallic additive manufacturing de-alloying AA2024 Al-alloy localized corrosion

收稿日期: 2021-06-29

ZTFLH:

TG172.5

基金资助:湖北省自然科学基金(2020CFB295);国家航空科学基金(2020Z008079004);国家自然科学基金(52001128)

通讯作者: 张欣欣 E-mail: xinxinzhang@hust.edu.cn

Corresponding author: ZHANG Xinxin E-mail: xinxinzhang@hust.edu.cn

作者简介: 赵海洋,男,1973年生,博士,教授级高级工程师

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引用本文:

赵海洋, 高多龙, 张童, 吕由, 张宇鹏, 张欣欣, 石鑫, 魏晓静, 刘冬梅, 董泽华. 电弧增材制造航空AA2024铝合金的微观结构及其腐蚀行为研究[J]. 中国腐蚀与防护学报, 2022, 42(4): 621-628.
Haiyang ZHAO, Duolong GAO, Tong ZHANG, You LV, Yupeng ZHANG, Xinxin ZHANG, Xin SHI, Xiaojing WEI, Dongmei LIU, Zehua DONG. Microstructure and Corrosion Evolution of Aerospace AA2024 Al-Alloy Thin Wall Structure Produced Through WAAM. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 621-628.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.149 或 https://www.jcscp.org/CN/Y2022/V42/I4/621

图1 WAAM工艺原理图

图2 WAAM薄壁结构经Barker试剂阳极氧化后的显微组织

图3 WAAM薄壁显微组织结构的SEM形貌

图4 S相、θ相和α相及薄壁结构中MPZ、MPB和HAZ的SEM像以及相应的EDX图

图5 MPB中金属间化合物团簇的HAADF显微图及其EDX图

图6 浸泡30 min和10 h后的WAAM薄壁的光学照片

图7 浸泡30 min和10 h后WAAM薄壁结构的SEM形貌

图8 MPB中典型局部腐蚀部位截面HAADF像及典型纳米粒子的EDX、高分辨TEM像和电子衍射像

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