Influence of Contaminated NH3 on Stress Corrosion Behavior of 7075 High Strength Aluminum Alloy in Marine Atmosphere Environment

DOI

10.2991/amcce-18.2018.118How to use a DOI?

Keywords

7075; Corrosion; Marine atmosphere; NH3.

Abstract

The addition of NH4+ in NaCl which could simulate the marine atmosphere environment contaminated NH3accelerates the corrosion process of 7075 high strength aluminum alloys. The acceleration effect is mainly promoted by the reaction process of aluminum alloy cathode. This is due to the fact that NH4+ leads to the acidification of solution to promote the occurrence of cathodic reaction. The addition of NH4+ increases the stress corrosion susceptibility of the 7075, and the sensitivity of stress corrosion increases with the increase of NH4+ concentration. The reason is that the acceleration of the cathodic reaction process caused by NH4+ promotes the precipitation of hydrogen and the diffusion in the aluminum alloy. At the same time, the corrosion effect of the aluminum alloy also changes the mechanical properties of the aluminum alloy, and the stress corrosion sensitivity of the high strength aluminum alloy increase.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Peiling Yan
PY  - 2018/05
DA  - 2018/05
TI  - Influence of Contaminated NH3 on Stress Corrosion Behavior of 7075 High Strength Aluminum Alloy in Marine Atmosphere Environment
BT  - Proceedings of the 2018 3rd International Conference on Automation, Mechanical Control and Computational Engineering (AMCCE 2018)
PB  - Atlantis Press
SP  - 683
EP  - 688
SN  - 2352-5401
UR  - https://doi.org/10.2991/amcce-18.2018.118
DO  - 10.2991/amcce-18.2018.118
ID  - Yan2018/05
ER  -