深冷-固溶-时效强化真空压铸铝合金的腐蚀行为

doi:10.13251/j.issn.0254-6051.2025.01.019

金属热处理 ›› 2025, Vol. 50 ›› Issue (1): 126-132.DOI: 10.13251/j.issn.0254-6051.2025.01.019

深冷-固溶-时效强化真空压铸铝合金的腐蚀行为

李志强¹, 刘光磊¹, 丁冉¹, 许福海¹, 陶诚^1,2, 刘海霞¹, 程晓农¹

1.江苏大学材料科学与工程学院, 江苏镇江 212013;
2.江苏铭利达科技有限公司, 江苏南通 226602

收稿日期:2024-07-29 修回日期:2024-11-07 出版日期:2025-01-25 发布日期:2025-03-12
通讯作者: 刘光磊,副教授,博士,E-mail:106409480@qq.com
作者简介:李志强(1995—),男,硕士,主要研究方向为铸造与金属材料强韧化,E-mail:739663947@qq.com。
基金资助:
国家自然科学基金青年项目(51801076);江苏省高等学校自然科学研究面上项目(18KJB430009);江苏省博士后科研资助计划项目(1601055C);江苏大学高级人才科研启动计划(14JDG126)

Corrosion behavior of a vacuum die-cast aluminum alloy strengthened by cryogenic-solution-aging treatment

Li Zhiqiang¹, Liu Guanglei¹, Ding Ran¹, Xu Fuhai¹, Tao Cheng^1,2, Liu Haixia¹, Cheng Xiaonong¹

1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang Jiangsu 212013, China;
2. Jiangsu Minglida Technology Co., Ltd., Nantong Jiangsu 226602, China

Received:2024-07-29 Revised:2024-11-07 Online:2025-01-25 Published:2025-03-12

摘要/Abstract

摘要： 研究了深冷-固溶-时效处理对真空压铸铝合金微观组织、力学性能的影响及其在3.5%NaCl溶液中浸泡不同时间后的腐蚀行为。结果表明,深冷-固溶-时效处理能够有效提升真空压铸铝合金的力学性能,其抗拉强度强度由铸态的184.8 MPa提升到249.5 MPa,硬度由90.3 HV0.1提高到124.6 HV0.1,伸长率由6.3%提升到7.7%。热处理促使铝合金的α-Al相、Si相和Al₅FeSi相变得细小且分布均匀,在浸泡腐蚀时有利于形成更为致密、更为均匀的钝化层,间接阻碍了氯离子向铝合金内部组织的侵入。与铸态合金相比,深冷-固溶-时效后合金的腐蚀进展缓慢,耐蚀性得到显著提升。

关键词: 真空压铸铝合金, 深冷-固溶-时效处理, 耐腐蚀性, 浸泡时间

Abstract: Effect of cryogenic-solution-aging treatment on microstructure and mechanical properties of a vacuum die-cast aluminium alloy and its corrosion behavior after immersion in 3.5%NaCl solution for different time were studied. The results show that the cryogenic-solution-aging treatment can effectively improve the mechanical properties of the vacuum die-cast alloy, and the tensile strength is increased from 184.8 MPa to 249.5 MPa, the hardness is increased from 90.3 HV0.1 to 124.6 HV0.1, and the elongation is increased from 6.3% to 7.7%. The cryogenic-solution-aging treatment promotes the α-Al phase, Si phase and Al₅FeSi phase in the aluminum alloy to become fine and distribute evenly, which is conducive to the formation of a denser and more uniform passivation layer during immersion, indirectly hindering the invasion of chloride ions into the internal structure of the aluminum alloy. Compared with the as-cast aluminum alloy, the corrosion progress of cryogenic-solution-aging treated alloy is slow, and the corrosion resistance is significantly improved.

Key words: vacuum die-casting aluminum alloy, cryogenic-solution-aging treatment, corrosion resistance, immersion time

中图分类号:

TG146.2

李志强, 刘光磊, 丁冉, 许福海, 陶诚, 刘海霞, 程晓农. 深冷-固溶-时效强化真空压铸铝合金的腐蚀行为[J]. 金属热处理, 2025, 50(1): 126-132.

Li Zhiqiang, Liu Guanglei, Ding Ran, Xu Fuhai, Tao Cheng, Liu Haixia, Cheng Xiaonong. Corrosion behavior of a vacuum die-cast aluminum alloy strengthened by cryogenic-solution-aging treatment[J]. Heat Treatment of Metals, 2025, 50(1): 126-132.

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深冷-固溶-时效强化真空压铸铝合金的腐蚀行为

Corrosion behavior of a vacuum die-cast aluminum alloy strengthened by cryogenic-solution-aging treatment

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