Comparison Study on the Semiconductive and Dissolution Behaviour of 316L and Alloy 625 in Hydrochloric Acid Solution

doi:10.1007/s40195-019-00979-z

Abstract

Abstract:

The corrosion behaviour of 316L and Alloy 625 was investigated using cyclic polarization, electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy, Auger electron spectroscopy and induced coupled plasma-optical emission spectrometer. The results indicated that Alloy 625 showed better corrosion resistance than 316L and the prolonging immersion time could enhance corrosion resistance of the two alloys. The passive film formed on the surface of 316L exhibited an electronic structure of p-p heterojunction, with Fe₃O₄ and Cr₂O₃ enriched in the outer and inner layers, respectively. However, Alloy 625 presented the electronic structure of n-p heterojunction dominated by the outer Fe₂O₃/NiFe₂O₄ and inner Cr₂O₃. This resulted in the opposite semiconductive properties of the passive films formed on the two materials. In the acid solutions, Fe and Mo suffered from selective dissolution while Cr and Ni were relatively stable. The corrosion rates were mainly dominated by the dissolution of iron. Alloy 625 presented better corrosion resistance than 316L due to the obviously lower content of Fe and the higher content of Cr and Ni in the passive film. The continuously selective dissolution of iron resulted in the increase in Cr/Fe ratio in the passive film, which was responsible for the enhancement in corrosion resistance.

Key words: Stainless steel, Induced coupled plasma (ICP), Polarization, X-ray photoelectron spectroscopy (XPS), Passive films

Zhu Wang, Zi-Ru Zhang, Lei Zhang, Zhe Feng, Min-Xu Lu. Comparison Study on the Semiconductive and Dissolution Behaviour of 316L and Alloy 625 in Hydrochloric Acid Solution[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(3): 403-414.

Figures/Tables 13

Table 1 Chemical compositions of the testing materials (wt%)

Fig. 1 Cyclic polarization curves obtained for 316L stainless steel and Alloy 625 in the hydrochloric acid solution

Fig. 2 Nyquist and Bode plots of testing materials in the hydrochloric acid solution: a Nyquist plots for 316L, b Nyquist plots for Alloy 625, c impedance magnitude versus frequency for 316L, d impedance magnitude versus frequency for Alloy 625, e phase angle versus frequency for 316L, f phase angle versus frequency for Alloy 625

Fig. 3 Equivalent circuits for simulating EIS results: a used for fitting the plots of 316L, b used for fitting the plots of Alloy 625

Table 2 Obtained equivalent circuit parameters

Fig. 4 High-resolution XPS spectra of Cr 2p3/2, Ni 2p3/2, Fe 2p3/2, and Mo 3d obtained on the 316L specimens after various immersion time

Fig. 5 High-resolution XPS spectra of Cr 2p3/2, Ni 2p3/2, Fe 2p3/2, and Mo 3d obtained on Alloy 625 specimens after various immersion time

Fig. 6 Atomic fractions of metallic elements in different oxidation states in the passive films formed on 316L and Alloy 625

Fig. 7 AES depth profiles of the passive films formed on 316L at various immersion time: a 1 h, b 15 h, c 50 h

Fig. 8 AES depth profiles of the passive films formed on Alloy 625 at various immersion time: a 1 h, b 15 h, c 50 h

Fig. 9 Mott-Schottky plots for the testing materials at various immersion time: a 316L, b Alloy 625

Fig. 10 Concentrations of Fe, Cr, Mo and Ni released into the solution as the function of immersion time: a 316L, b Alloy 625

Fig. 11 Selective coefficients of Fe, Cr, Mo and Ni as a function of time: a 316L, b Alloy 625

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