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.
Highlights
7050 aluminum alloy (AA7050) belongs to high strength Al-Zn-Mg-Cu series alloy with outstanding performance of high strength, excellent welding and processing properties which make it be one of the main structural materials in aerospace and automobile industries [1,2,3]
With the development of analytic techniques, analysis of elements to In stress cracking samples plays an increasing important role in researchthe of corrosion behavior the corrosion cracking samples plays an increasing important role in research of corrosion behavior present work, the stress corrosion cracking (SCC) behavior of 7050 aluminum alloy has been studied by double cantilever beam
NaCl solution, each applied a −1100 mV cathodic potential, the dark area in fracture surface was the crack propagation depth which suggested that 7050 aluminum alloy with 8 h aging surface was the crack propagation depth which suggested that 7050 aluminum alloy with 8 h aging time had the worst corrosion resistance, and 24 h was the best
Summary
7050 aluminum alloy (AA7050) belongs to high strength Al-Zn-Mg-Cu series alloy with outstanding performance of high strength, excellent welding and processing properties which make it be one of the main structural materials in aerospace and automobile industries [1,2,3] This type of alloy is very sensitive to stress corrosion cracking (SCC) that means corrosion cracks will be expanded in internal alloy with long-term usage under corrosive environment, there would not exist any significant omen before the fracture of alloy component [4]. With the development of analytic techniques, analysis of elements to In stress cracking samples plays an increasing important role in researchthe of corrosion behavior [13]. The corrosion cracking samples plays an increasing important role in research of corrosion behavior present work, the SCC behavior of 7050 aluminum alloy has been studied by double cantilever beam [13]. Examine the effect of aging on microstructure of 7050 aluminum alloy
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