Effects of Prior Corrosion with and Without Stress on the Mechanical Properties of 7475-T761 Aluminum Alloy

doi:10.1007/s40195-015-0238-4

Abstract

Abstract:

The effect of prior corrosion on the mechanical properties of 7475-T761 aluminum alloy was investigated by immersion test, stress corrosion test, cathode charge method and electrochemical polarization test. Results show that prior corrosion in the solution with 3 wt% NaCl and 0.5 wt% H₂O₂ leads to mechanical properties deterioration of 7475-T761 aluminum alloy. Moreover, the elongation decreases significantly. This is mainly attributed to electrochemical corrosion and hydrogen embrittlement, in which corrosion plays a major role. Tensile stress promotes the degradation of the mechanical properties by accelerating the pitting corrosion and hydrogen embrittlement.

Key words: Prior corrosion, Corrosion with stress, 7475 aluminum alloy, Mechanical properties, Hydrogen embrittlement

Zuo-Yan Ye, Dao-Xin Liu, Meng Yuan, Xiao-Ming Zhang, Zhi Yang, Ming-Xia Lei. Effects of Prior Corrosion with and Without Stress on the Mechanical Properties of 7475-T761 Aluminum Alloy[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(5): 608-613.

Figures/Tables 10

Fig. 1 Optical image of 7475-T761 aluminum alloy

Fig. 2 Schematic diagram of stress ring device (1 themocouple, 2 Luggin capillary, 3 platinum plate, 4 heating element, 5 sample, 6 plexiglass container, 7 strainfoil)

Fig. 3 Corrosion pit depth varying with time

Fig. 4 Residual strength of samples varying with test time

Fig. 5 Residual elongation of samples varying with test time

Fig. 6 Elongation of the samples after 7 days of test

Fig. 7 a Fracture surface of a prior corroded 7-day sample without stress, b magnified image of the quasicleavage region, denoted by A in a, c magnified image of the ductile region, denoted by B in a

Fig. 8 Fracture surface of a cathodic polarized sample (-1.5 V vs. SCE, 7 days) without stress: a inner and edge, b quasicleavage region at the edge of fracture surface

Fig. 9 Potentiodynamic polarization curves of 7475-T761 aluminum alloy in 3.5 wt% NaCl + 0.5 wt% H2O2 solution with and without stress

Table 1 Fitting data of polarization curves

Sample	E _corr (V)	i _corr (mA/cm²)
Unloaded	-0.730	0.1445
75% σ_s loaded	-0.777	1.062

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