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Materials 2016, 9(11), 884; doi:10.3390/ma9110884

A Study on the Susceptibility to SCC of 7050 Aluminum Alloy by DCB Specimens

1
Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China
2
Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou 213164, China
3
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
*
Author to whom correspondence should be addressed.
Academic Editor: Alex A. Volinsky
Received: 15 August 2016 / Revised: 21 October 2016 / Accepted: 26 October 2016 / Published: 1 November 2016
(This article belongs to the Special Issue Stress Corrosion Cracking in Materials)
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Abstract

The stress corrosion cracking (SCC) of different aging states for 7050 aluminum alloy in 3.5% sodium chloride aqueous solution has been studied by means of double cantilever beam (DCB) specimens, cathodic polarization, scanning electron microscope (SEM), transmission electron microscope (TEM) and time-of-flying second ion mass spectrometer (ToF-SIMS). The results showed that the susceptibility to SCC (Iscc) of 7050 aluminum alloy decreases with increasing the aging time. When a cathodic polarization potential of −1100 mV was applied to DCB specimens, the ion current intensity of hydrogen (IH+) near the crack tip and Iscc increased obviously, thus the degree of the diffusion of hydrogen into the grain boundary become more serious. The observation of microstructure indicated that the precipitates on the grain boundary become coarse and are sparsely distributed with increasing the aging time of 7050 aluminum alloy. View Full-Text
Keywords: 7050 aluminum alloy; stress corrosion cracking; DCB specimen; aging; cathodic polarization 7050 aluminum alloy; stress corrosion cracking; DCB specimen; aging; cathodic polarization
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Qi, X.; Jin, J.; Dai, C.; Qi, W.; He, W.; Song, R. A Study on the Susceptibility to SCC of 7050 Aluminum Alloy by DCB Specimens. Materials 2016, 9, 884.

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