Effect of Hydrogen on Corrosion and Stress Corrosion Cracking of AZ91 Alloy in Aqueous Solutions

doi:10.1007/s40195-015-0358-x

Abstract

Abstract:

The effect of hydrogen on the corrosion and stress corrosion cracking of the magnesium AZ91 alloy has been investigated in aqueous solutions. Hydrogen produced by corrosion in water diffuses into, and reacts with the Mg matrix to form hydride. Some of the hydrogen accumulates at hydride/Mg matrix (or secondary phase) interfaces as a consequence of slow hydride formation and the incompatibility of the hydride with the Mg matrix (or secondary phase), and combines to form molecular hydrogen. This leads to the development of a local pressure at the hydride/Mg matrix (or secondary phase) interface. The expansion stress caused by hydride formation and the local hydrogen pressure due to its accumulation result in brittle fracture of hydride. These two combined effects promote both the corrosion rate of the AZ91 alloy, and crack initiation and propagation even in the absence of an external load. Hydrogen absorption leads to a dramatic deterioration in the mechanical properties of the AZ91 alloy, indicating that hydrogen embrittlement is responsible for transgulanar stress corrosion cracking in aqueous solutions.

Key words: AZ91 alloy, Corrosion, Hydrogen, Secondary ion mass spectroscopy (SIMS), Transgulanar stress corrosion cracking (TGSCC)

Jian Chen, Jian-Qiu Wang, En-Hou Han, Wei Ke, D. W. Shoesmith. Effect of Hydrogen on Corrosion and Stress Corrosion Cracking of AZ91 Alloy in Aqueous Solutions[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(1): 1-7.

Figures/Tables 5

Fig. 1 Microstructure of as-cast AZ91 alloy [39]

Fig. 2 Cross sections of as-cast AZ91 magnesium alloy: a after immersion in 0.1 mol/L Na2SO4 solution under natural corrosion condition for 480 h, b after cathodic charging in 0.1 mol/L Na2SO4 solution at 27.8 mA/cm2 for 3 h, c after cathodic charging in 0.1 mol/L Na2SO4 solution at 27.8 mA/cm2 for 3 h and then immersion in fresh 0.1 mol/L Na2SO4 solution under natural corrosion condition for 4 h [35]

Fig. 3 Surface morphology of the pre-charged AZ91 alloy after vacuum annealing at: a 150°C, b 350°C, c 480°C [35]

Fig. 4 Element mapping of the pre-charged AZ91 alloy using SIMS: H mapping a, Al mapping b after vacuum annealing at 150°C, H mapping c, Al mapping d after vacuum annealing at 480°C [35]

Fig. 5 Surface morphology of as-cast AZ91 magnesium alloy after cathodic charging in 0.1 mol/L NaOH solution at 27.8 mA/cm2 for a 1 h, b 3 h [50]

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