淬火水温对Al-Mg-Si系合金力学性能和耐腐蚀性的影响

doi:10.13251/j.issn.0254-6051.2020.10.002

金属热处理 ›› 2020, Vol. 45 ›› Issue (10): 6-10.DOI: 10.13251/j.issn.0254-6051.2020.10.002

淬火水温对Al-Mg-Si系合金力学性能和耐腐蚀性的影响

魏满想^1,2, 何立子^1,2

1.东北大学材料电磁过程研究教育部重点实验室, 辽宁沈阳 110819;
2.东北大学材料科学与工程学院, 辽宁沈阳 110819

收稿日期:2020-03-26 出版日期:2020-10-25 发布日期:2020-12-29
通讯作者: 何立子,教授,博士,E-mail:helizi@epm.neu.edu.cn
作者简介:魏满想(1992—),男,硕士研究生,主要研究方向为铝合金的研发与应用,E-mail:weimx940304@163.com。
基金资助:
国家自然科学基金(51574706)

Effect of quenching water temperature on mechanical properties and corrosion resistance of Al-Mg-Si series alloy

Wei Manxiang^1,2, He Lizi^1,2

1. Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang Liaoning 110819, China;
2. School of Materials Science and Engineering, Northeastern University, Shenyang Liaoning 110819, China

Received:2020-03-26 Online:2020-10-25 Published:2020-12-29

摘要/Abstract

摘要： 采用拉伸性能测试、光学显微镜、扫描电镜和电化学性能测试等方法研究了固溶处理时冷却水温度对Al-Mg-Si系合金性能的影响。结果表明:固溶处理时,随着淬火水温的升高,合金的抗拉强度、屈服强度变化不明显,而合金的伸长率与硬度有所降低,即20 ℃水温淬火时合金具有良好的综合力学性能,显微硬度为129.4 HV0.3,抗拉强度为 352.2 MPa,屈服强度为 300.9 MPa;同时合金的抗晶间腐蚀性逐渐下降,而抗剥落腐蚀性影响不大,均为PC等级。因此,20 ℃水温淬火时合金具有最佳的抗晶间腐蚀性能,最大腐蚀深度为231.4 μm,这与电化学性能测试结果相对应,此时的腐蚀电位最大,为-0.834 V。

关键词: Al-Mg-Si系合金, 淬火温度, 晶间腐蚀, 剥落腐蚀, 力学性能

Abstract: Effect of water temperature on properties of Al-Mg-Si series alloy during solution treatment was studied by means of tensile properties test, optical microscope, scanning electron microscopy, and electrochemical performance test. The results show that with the increase of quenching water temperature during solution treatment, the tensile strength and yield strength of the alloy are not changed significantly, and the elongation and hardness of the alloy are decreased, that is, the alloy has good comprehensive mechanical properties when quenched at 20 ℃, the microhardness, the tensile strength and the yield strength are 129.4 HV0.3, 352.2 MPa, 300.9 MPa, respectively.Meanwhile, the resistance to intergranular corrosion of the alloy is gradually decreased, but the resistance to spalling corrosion is changed a little, which are both PC grades. Therefore, the alloy has the best resistance to intergranular corrosion when quenched in water at 20 ℃, and the maximum corrosion depth is 231.4 μm, which is in accord with the results of electrochemical performance test, the maximum corrosion potential is -0.834 V.

Key words: Al-Mg-Si series alloy, quenching temperature, intergranular corrosion, spalling corrosion, mechanical properties

中图分类号:

TG146.21

魏满想, 何立子. 淬火水温对Al-Mg-Si系合金力学性能和耐腐蚀性的影响[J]. 金属热处理, 2020, 45(10): 6-10.

Wei Manxiang, He Lizi. Effect of quenching water temperature on mechanical properties and corrosion resistance of Al-Mg-Si series alloy[J]. Heat Treatment of Metals, 2020, 45(10): 6-10.

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淬火水温对Al-Mg-Si系合金力学性能和耐腐蚀性的影响

Effect of quenching water temperature on mechanical properties and corrosion resistance of Al-Mg-Si series alloy

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