Monitoring the Diffusion Layer During Passive Film Breakdown on Alloy 800 with Digital Holography

doi:10.1007/s40195-015-0309-6

Abstract

Abstract:

The effects of chloride and thiosulfate ions on localized corrosion of alloy 800 are investigated through dynamical observation of the change in phase image of the diffusion layer during passive film breakdown using digital holography. The results indicate that solution chemistry has a significant effect on film breakdown and diffusion layer. The phase distribution changes at different applied potentials show that in the process of film breakdown, dissolution of metal ions from pitting is not remarkable in chloride-only solution, whereas dissolution of metal ions is significantly high in thiosulfate and chloride solution. Thiosulfate has a combined effect with chloride ions in passive film degradation.

Key words: Passive film, Breakdown, Diffusion layer, Digital holography, Alloy 800

Da-Hai Xia, Jing-Li Luo, Zhi-Ming Gao, Bo-Yu Yuan, Liang Li, Chao Wang. Monitoring the Diffusion Layer During Passive Film Breakdown on Alloy 800 with Digital Holography[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(9): 1170-1174.

Figures/Tables 6

Table 1 Chemical compositions of alloy 800 (in wt%)

C	Si	Mn	P	S	Cr	Ni	Co	Ti	Cu	Al	N	Fe
0.017	0.46	0.5	0.012	0.001	21.87	32.78	0.01	0.48	0.02	0.29	0.016	43.2

Fig. 1 Cyclic voltammogram of the alloy 800 in 0.6 mol/L NaCl solution with the scan rate of 10 mV/s.

Fig. 2 Corresponding phase maps at various polarization potentials that marked by letters A a, B b, C c, D d, E e, F f, G g and H h in Fig. 1.

Fig. 3 Cyclic voltammogram of the alloy 800 in 0.6 mol/L NaCl + 0.075 mol/L Na2S2O3 solution with the scan rate of 10 mV/s.

Fig. 4 Corresponding phase maps at various polarization potentials that marked by letters A′ a, B′ b, C′ c, D′ d, E′ e, F′ f, G′ g in Fig. 3.

Fig. 5 SEM images of alloy 800 after testing in 0.6 mol/L NaCl solution a and 0.6 mol/L NaCl + 0.075 mol/L Na2S2O3 solution b.

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