Effects of polarisation on mechanical properties and stress corrosion cracking susceptibility of 7050 aluminium alloy. (October 2014)

• Record Type: Journal Article
• Authors: Qi, X.; Song, R. G.; Qi, W. J.; Jin, J. R.; Wang, C.; Li, H.
• Is Part Of: Corrosion engineering, science, and technology. Volume 49:Number 7(2014)
• Page Start: 643
• Page End: 650
• Publication Date: 2014-10
• Subjects: Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1179/1743278214Y.0000000162
• Languages: English
• ISSNs: 1478-422X

Abstract

<abstract> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <p>The effects of polarisation (including cathodic and anodic polarisation) on mechanical properties and stress corrosion cracking (SCC) susceptibility (<italic>I</italic>_SCC) of 7050 aluminium alloy have been investigated by means of polarisation and slow strain rate test. The results of cathodic polarisation experiments showed that the <italic>I</italic>_SCC increased with shifting negatively the polarisation potential when the cathodic potential <italic>E</italic>_C≧−1100 mV(SCE), while it decreased with shifting negatively the polarisation potential when the cathodic potential <italic>E</italic>_C&lt;−1100 mV(SCE). Anodic polarisation experiments demonstrated that the <italic>I</italic>_SCC increased severely with increasing the polarisation potential. In addition, the extents for the effect of polarisation potential on <italic>I</italic>_SCC were different among the 7050 aluminium alloy under various aging states. Polarisation was of the biggest effect on the <italic>I</italic>_SCC of under aged state, the smallest effect of over aged state and the middle effect of peak aged state. The SCC mechanism of aluminium alloy was a combination of anodic dissolution and hydrogen embrittlement, and the effects of hydrogen on SCC increased with increasing the hydrogen concentration.</p> </abstract>