Effect of Aging Treatment on the Corrosion Resistance Properties of 7N01 Extrusion Aluminum Alloy

The influences of non-isothermal aging (the temperature range is 150–180 °C, and the heating rate is 5 and 20 °C/h alternately), single-peak aging (aging at 120 °C for 24 h, then water quenched was followed at room temperature), and two-stage aging (aging at 105 °C for 8 h first, then increasing agi...

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Main Authors: Yitai Li, Weiou Qin, Shuyuan Yu, Jun La, Yaokun Fu, Jidong Li, Wenchao Yang, Yongzhong Zhan
Format: Article
Language:English
Published: MDPI AG 2021-06-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/14/13/3615
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spelling doaj-7519702393694eae8eeb9c57d823f4752021-07-15T15:40:44ZengMDPI AGMaterials1996-19442021-06-01143615361510.3390/ma14133615Effect of Aging Treatment on the Corrosion Resistance Properties of 7N01 Extrusion Aluminum AlloyYitai Li0Weiou Qin1Shuyuan Yu2Jun La3Yaokun Fu4Jidong Li5Wenchao Yang6Yongzhong Zhan7School of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaShenzhen Customs Industrial Products Inspection Technology Center, Shenzhen 518067, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaSchool of Resources, Environment and Materials, Guangxi University, Nanning 530004, ChinaThe influences of non-isothermal aging (the temperature range is 150–180 °C, and the heating rate is 5 and 20 °C/h alternately), single-peak aging (aging at 120 °C for 24 h, then water quenched was followed at room temperature), and two-stage aging (aging at 105 °C for 8 h first, then increasing aging temperature to 135 °C and keeping for 12 h, followed by water quenching at room temperature) on the corrosion resistance and microstructure of the 7N01 aluminum alloy under 3.5 wt.% NaCl were investigated using electric polarization curve test and exfoliation corrosion. After aging, the hardness of samples was measured by a Vickers micro-hardness tester, and the electrical conductivities were obtained using the eddy current method. The results show that the steady phase η and metastable phase η′ are precipitated in the grain boundary of 7N01 aluminum alloy after non-isothermal aging, and their distribution is discontinuous. The hardness of the alloy can reach 136.9 HV1 and the electrical conductivity can reach 35.8% IACS, which is close to the hardness of single-peak aging and the conductivity of two-stage aging, respectively. Compared with single-peak aging, the corrosion current density of non-isothermal aging is reduced by 15.5%, and that of two-stage aging is reduced by 28.9%.https://www.mdpi.com/1996-1944/14/13/3615aluminum alloy corrosion7N01 alloy corrosioncorrosion rateaging treatmentnon-isothermal aging
collection DOAJ
language English
format Article
sources DOAJ
author Yitai Li
Weiou Qin
Shuyuan Yu
Jun La
Yaokun Fu
Jidong Li
Wenchao Yang
Yongzhong Zhan
spellingShingle Yitai Li
Weiou Qin
Shuyuan Yu
Jun La
Yaokun Fu
Jidong Li
Wenchao Yang
Yongzhong Zhan
Effect of Aging Treatment on the Corrosion Resistance Properties of 7N01 Extrusion Aluminum Alloy
Materials
aluminum alloy corrosion
7N01 alloy corrosion
corrosion rate
aging treatment
non-isothermal aging
author_facet Yitai Li
Weiou Qin
Shuyuan Yu
Jun La
Yaokun Fu
Jidong Li
Wenchao Yang
Yongzhong Zhan
author_sort Yitai Li
title Effect of Aging Treatment on the Corrosion Resistance Properties of 7N01 Extrusion Aluminum Alloy
title_short Effect of Aging Treatment on the Corrosion Resistance Properties of 7N01 Extrusion Aluminum Alloy
title_full Effect of Aging Treatment on the Corrosion Resistance Properties of 7N01 Extrusion Aluminum Alloy
title_fullStr Effect of Aging Treatment on the Corrosion Resistance Properties of 7N01 Extrusion Aluminum Alloy
title_full_unstemmed Effect of Aging Treatment on the Corrosion Resistance Properties of 7N01 Extrusion Aluminum Alloy
title_sort effect of aging treatment on the corrosion resistance properties of 7n01 extrusion aluminum alloy
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2021-06-01
description The influences of non-isothermal aging (the temperature range is 150–180 °C, and the heating rate is 5 and 20 °C/h alternately), single-peak aging (aging at 120 °C for 24 h, then water quenched was followed at room temperature), and two-stage aging (aging at 105 °C for 8 h first, then increasing aging temperature to 135 °C and keeping for 12 h, followed by water quenching at room temperature) on the corrosion resistance and microstructure of the 7N01 aluminum alloy under 3.5 wt.% NaCl were investigated using electric polarization curve test and exfoliation corrosion. After aging, the hardness of samples was measured by a Vickers micro-hardness tester, and the electrical conductivities were obtained using the eddy current method. The results show that the steady phase η and metastable phase η′ are precipitated in the grain boundary of 7N01 aluminum alloy after non-isothermal aging, and their distribution is discontinuous. The hardness of the alloy can reach 136.9 HV1 and the electrical conductivity can reach 35.8% IACS, which is close to the hardness of single-peak aging and the conductivity of two-stage aging, respectively. Compared with single-peak aging, the corrosion current density of non-isothermal aging is reduced by 15.5%, and that of two-stage aging is reduced by 28.9%.
topic aluminum alloy corrosion
7N01 alloy corrosion
corrosion rate
aging treatment
non-isothermal aging
url https://www.mdpi.com/1996-1944/14/13/3615
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