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Journal of Chinese Society for Corrosion and protection  2016, Vol. 36 Issue (6): 535-542    DOI: 10.11902/1005.4537.2016.190
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Influence of HSO3- on Passive Film Composition and Corrosion Resistance of 2205 Duplex Stainless Steelin Simulated Seawater
Tianyi ZHANG,Junsheng WU(),Hailong GUO,Xiaogang LI
Corrosion and Protection Center, Institute of Advanced Materials, University of Science and Technology Beijing, Beijing 100083, China
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Abstract  

Corrosion behavior of 2205 duplex stainless steel in simulated seawater containing different concentration of NaHSO3 has been systemically investigated by means of potentiodynamic polarization and electrochemical impedance spectrum (EIS) measurements. While the defects and the compositions of the formed passive films on the steel were characterized by Mott-Schottky and XPS respectively. The results demonstrate that the existence of HSO3- in the simulated seawater contributes to the increase of metal oxide content in the passive film formed on 2205 stainless steel. In the simulated seawater containing 0.01 mol/L HSO3-, 2205 duplex stainless steel presents the worst corrosion resistant performance, correspondingly the calculated defect concentration for the formed passive film is consistent to the electrochemical test results. The oxidation of HSO3- induces the formation of HSO4- in aqueous solution, which will give rise to the releasing of hydrogen ions, leading to the increase of acidity of the solution and thus induces the damage of the passive film on 2205 stainless steel. However, when the concentration of HSO3- in simulated seawater is less than 0.01 mol/L, the corrosion resistance of the steel will rise again. This is because the competitive adsorption between HSO3- and Cl- on the 2205 stainless steel surface can inhibit the adsorption of Cl-, which then results in the decline of the pitting corrosion probability.
Key words:  2205 duplex stainless steel      passive film      defect      simulated seawater      competitiveadsorption     
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Tianyi ZHANG
Junsheng WU
Hailong GUO
Xiaogang LI

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Tianyi ZHANG,Junsheng WU,Hailong GUO,Xiaogang LI. Influence of HSO3- on Passive Film Composition and Corrosion Resistance of 2205 Duplex Stainless Steelin Simulated Seawater. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 535-542.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.190     OR     https://www.jcscp.org/EN/Y2016/V36/I6/535

Fig.1  Dynamic potential polarization curves (a) of 2205 stainless steel in simulated seawater solutions and the relationship between NaHSO3 concentration and pitting corrosion potential of 2205 stainless steel (b)
Fig.2  Nyquist diagram (a) and Bode diagram (b) of 2025 stainless steel in simulated seawater solutions with different concentrations of HSO3-, and corresponding equivalent circuit (c)
Concentration of NaHSO3 / molL-1 Rs / Ω CPEdl / F ndl Rct / Ω CPEfilm / F nfilm Rfilm / Ω
0 5.805 5.06×10-5 0.8924 2.34×105 1.68×10-5 0.7992 2.20×105
0.005 5.597 5.97×10-5 0.8798 3.05×104 2.10×10-3 1 3.77×104
0.01 6.235 6.19×10-5 0.8587 2.50×104 3.36×10-3 1 1.82×104
0.05 6.106 6.34×10-5 0.8976 6.20×104 1.90×10-3 0.8670 2.23×104
0.1 5.456 5.83×10-5 0.8608 9.70×104 8.47×10-4 1 6.14×104
Table 2  Fitting results of impedance spectra of 2205 duplex stainless steel in simulated seawaters with differentconcentrations of HSO3-
Fig.3  Relationship between Rfilm and NaHSO3concentration
Fig.4  Mott-Schottky curves of 2205 duplex stainless steel in simulated seawater solutions with different concentrations of HSO3- (a) and variation of Nd in formed passivation films with NaHSO3 concentration (b)
Concentration of NaHSO3 / molL-1 Fit-slope Nd / cm-3
0 5.83×109 1.55×1021
0.0050 3.84×109 2.36×1021
0.010 2.35×109 3.84×1021
0.050 4.26×109 2.13×1021
0.10 5.71×109 1.59×1021
Table 3  Calculation results of Mott-schottky curve
Fig.5  XPS spectua of full (a), Cr (b), Fe (c) and S (d) for the passive film of 2025 stainless steel in simulated seawatersolution with 0.01 mol/L HSO3-
Concentration of HSO3- / molL-1 Cr Cr2O3 Cr(OH)3 CrO3
0 0.384 0.272 0.179 0.164
0.005 0.174 0.307 0.333 0.186
0.01 0.139 0.310 0.327 0.224
0.05 0.157 0.300 0.344 0.200
0.1 0.161 0.312 0.309 0.218
Table 4  Contents of Cr with different valence states in passivation films formed in simulated seawatersolutions with different concentrations of HSO3- (mass fraction / %)
Concentration of HSO3- / molL-1 Fe Fe3O4 FeO Fe2O3 FeOOH
0 0.531 0.228 0.039 0.083 0.119
0.005 0.302 0.303 0.180 0.097 0.117
0.01 0.304 0.296 0.185 0.101 0.113
0.05 0.347 0.345 0.108 0.095 0.105
0.1 0.286 0.292 0.185 0.089 0.148
Table 5  Contents of Fe with different valence states in passivation films formed in simulated seawatersolutions with different concentrations of HSO3- (mass fraction / %)
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