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Journal of Chinese Society for Corrosion and protection  2018, Vol. 38 Issue (2): 203-209    DOI: 10.11902/1005.4537.2017.030
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Corrosion Resistance of Fe-based Bulk Metallic Glass with Sulfide Inclusions in HCl Solution
Yong HUANG, Shanlin WANG(), Shuaixing WANG, Yubing GONG, Liming KE
Light Alloy Processing Science and Defence Technology Key Laboratory, Nanchang Hangkong University, Nanchang 330063, China
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Abstract  

The corrosion behavior of Fe-based bulk metallic glass with sulfide inclusions in HCl solution was investigated by electrochemical test technique and immersion test. Results showed that the Fe-based bulk metallic glass presented obvious passivation characteristic in solutions with various amount of HCl at different temperature, however its corrosion resistance gradually decreased with the increasing HCl-concentration and temperature. The as-casted amorphous alloy had just only one capacitive loop, which indicated that the faraday process of the electrode system was controlled by the electrode potential. The SEM corrosion morphology after immersion tests showed that sulfide inclusions presented non-obvious influence on the corrosion behavior of Fe-based bulk metallic glass, whilst non-obvious pitting corrosion was triggered.
Key words:  sulfide inclusion      Fe-based bulk metallic glass      corrosion resistance      HCl solution     
Received:  22 February 2017     
Fund: Supported by National Natural Science Foundation of China (51461031), Jiangxi Science and Technology Key R&D Plan (20161BBH80031) and Jiangxi Provincial Education Department Fund (GJJ150733)
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Articles by authors
Yong HUANG
Shanlin WANG
Shuaixing WANG
Yubing GONG
Liming KE

Cite this article: 

Yong HUANG, Shanlin WANG, Shuaixing WANG, Yubing GONG, Liming KE. Corrosion Resistance of Fe-based Bulk Metallic Glass with Sulfide Inclusions in HCl Solution. Journal of Chinese Society for Corrosion and protection, 2018, 38(2): 203-209.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.030     OR     https://www.jcscp.org/EN/Y2018/V38/I2/203

Alloy C Si B P Cr Mn Ti Al Ni Ca O N S Fe
Fe-C 4.28 0.46 --- 0.20 --- 0.20 0.03 --- 0.09 --- --- --- 0.04 94.70
Fe-P 0.02 0.01 --- 26.28 --- 0.69 0.35 --- --- 0.01 --- --- 0.01 72.63
Fe-B 0.17 0.65 19.75 0.04 --- 0.21 --- 0.05 --- --- 0.02 0.01 --- 79.10
Fe-Cr 1.43 0.33 --- 0.02 55.49 --- --- --- --- --- 0.24 0.01 --- 42.48
Fe-S 0.22 1.13 --- --- --- --- --- --- --- --- 1.29 --- 49.7 47.64
Table 1  Chemical compositions of the used industrial raw materials
(mass fraction / %)
Fig.1  XRD pattern of the amorphous casting rod
Fig.2  Fracture morphology of the amorphous cast rod (a) and the magnified image of area A in Fig.2a (b)
Fig.3  EDS analysis result of the inclusion
Fig.4  Potentiodynamic polarization curves of the amorphous cast rod in HCl solutions with different concentrations
C(HCL) / molL-1 Icorr / μAcm-2 Ipass / μAcm-2 Ecorr / V Epit-Epass / V Rs / Ωcm-2 CPE / μFcm-2 Rp / Ωcm-2
0.1 9.57 117.48 -0.38 1.32 50.73 14.28 50177.00
0.5 56.49 682.33 -0.43 1.35 6.96 7.42 43840.00
1 50.12 1166.82 -0.33 1.26 5.88 25.17 20809.00
2 148.25 2297.21 -0.43 1.11 4.29 30.11 16385.00
4 524.81 1548.82 -0.17 1.11 2.61 74.33 16566.00
Table 2  Fitting results of potentiodynamic polarization curves and EIS of the amorphous cast rod in HCl solutions with different concentrations
Fig.5  Patentiostatic polarization curves of the amorphous cast rod in HCl solutions with different concentrations
Fig.6  EIS (a) and the equivalent circuit (b) of the amorphous cast rod in HCl solutions with different concentrations
Fig.7  Potentiodynamic polarization curves of the amorphous cast rod in 1 mol/L HCl solution at different temperatures
Temp. / ℃ Icorr / μAcm-2 Ipass / μAcm-2 Ecorr / V Epit-Epass / V Rs / Ωcm-2 CPE / μFcm-2 Rp / Ωcm-2
20 33.88 154.88 -0.32 1.24 5.88 25.17 28209.00
40 111.17 382.82 -0.28 1.21 4.78 108.27 6169.00
60 125.31 954.99 -0.32 1.13 4.00 499.41 733.90
Table 3  Fitting results of potentiodynamic polarization curves and EIS of the amorphous cast rod in 0.5 mol/L HCl solution at different temperatures
Fig.8  Patentiostatic polarization curves of the amorphous cast rod in 1 mol/L HCl solution at different temperatures
Fig.9  EIS of the amorphous cast rod in 1 mol/L HCl solution at different temperatures
Fig.10  Corrosion morphologies of the amorphous cast rod after immersion in 0.5 mol/L HCl solution for 0 h (a), 24 h (b), 72 h (c) and 168 h (d)
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