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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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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