Table 1

Actual composition of two alloys (mass fraction) %"

Table 2

Composition and content of electroplating solution mg$\cdot$cm$^{-3}$"

Fig. 1

Optical microstructure of Fe-13Cr-6Al-2Mo alloy and Fe-13Cr-6Al-2Mo-0.5Nb alloy"

Fig. 2

XRD patterns of Fe-13Cr-6Al-2Mo alloy and Fe-13Cr-6Al-2Mo-0.5Nb alloy"

Fig. 3

SEM and EDS of Fe-13Cr-6Al-2Mo alloy and Fe-13Cr-6Al-2Mo-0.5Nb alloy"

Table 3

Elements contents of precipitated phase in Fe-13Cr-6Al-2Mo-0.5Nb alloy (atom percent) %"

Fig. 4

Microstructure and electron diffraction pattern of matrix and precipitated phase in Fe-13Cr-6Al-2Mo-0.5Nb alloy "

Fig. 5

Hydrogen permeability curves of two alloys at 35 ${^\circ}$C"

Table 4

Diffusion parameters of hydrogen atoms in two alloy samples"

Fig. 6

Hydrogen permeation normalization curves of Fe-13Cr-6Al-2Mo alloy and Fe-13Cr-6Al-2Mo-0.5Nb alloy samples at different temperatures "

Table 5

Apparent diffusion coefficient of hydrogen in two alloy samples at different experimental temperatures"

Fig. 7

Relationship between ln D$_{\rm ap}$ and 1 000/T in the hydrogen permeation of two alloy samples"