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Journal of Chinese Society for Corrosion and protection  2016, Vol. 36 Issue (5): 433-440    DOI: 10.11902/1005.4537.2015.205
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Effect of Si on Corrosion Behavior of Model Bridge Steels by Alternative Wetting/drying Test in an Artificial Medium Simulated Hot and Humid Atmosphere of Marine and Industrial Area
Dongliang LI,Guiqin FU,Miaoyong ZHU()
School of Metallurgy, Northeastern University, Shenyang 110819, China
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Abstract  

The effect of Si on the corrosion behavior of two model bridge steels by alternative wetting and drying test in an artificial medium of 0.1 mol/L NaCl+0.01 mol/L NaHSO3, which aims to simulate the atmosphere corrosion of marine and industrial area, was investigated by mass loss method, polarization curve measurement, X-ray diffraction and scanning electron microscope with energy spectrum. The results indicate that the corrosion process of the two steels follows fairly well a power function of W=At n. When the Si content increases from 0.25% (mass fraction) to 0.48%, the weathering resistance of the two steels enhanced. However, with the increase of the thickness of the protective rust layer, the positive effect of Si weakened gradually. Si plays a significant role in strengthening ferrite microstructure, refining the grain size of corrosion products and promoting the crystallization of iron oxide, which enable the protectiveness of the rust layer to be increased in a short time. Besides, Si enriched in the edge of cracks and holes of the rust layer, that may be beneficial to the mending of defects. In the rust layer, Si exists mainly in the phase Fe2SiO4, which has an inverse spinel structure, and thus can enhance the stability of the rust layer.
Key words:  bridge steel      atmospheric corrosion      industrial-marine atmosphere      hot and humid environment      rust layer     
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Dongliang LI
Guiqin FU
Miaoyong ZHU

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Dongliang LI,Guiqin FU,Miaoyong ZHU. Effect of Si on Corrosion Behavior of Model Bridge Steels by Alternative Wetting/drying Test in an Artificial Medium Simulated Hot and Humid Atmosphere of Marine and Industrial Area. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 433-440.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.205     OR     https://www.jcscp.org/EN/Y2016/V36/I5/433

Steel C Si Mn P S Nb Ti Ni Cu Fe
1# 0.035 0.25 0.75 0.018 0.001 0.060 0.01 0.20 0.32 Bal.
2# 0.037 0.48 0.69 0.016 0.001 0.064 0.01 0.21 0.32 Bal.
Table 1  Chemical compositions of experimental steels(mass fraction / %)
Fig.1  Metallographic microstructure of 1# (a) and 2# (b) experimental steels
Fig.2  Corrosion depth and corrosion rate vs corrosion time for two experimental steels
Steel d / μm v / mma-1
1# d=1.72844t 0.71829,R2=0.99894 v=13.05361t -0.25275,R2=0.98785
2# d=1.27265t 0.76508,R2=0.99994 v=11.35520t -0.23852,R2=0.99941
Table 2  Fitting results of corrosion kinetic curves of experimental steels
Fig.3  SEM images of rust layers of 1# (a, c) and 2# (b, d) steels after corrosion for 144 h (a, b) and 336 h (c, d)
Fig.4  Cross sections (a, b, e, f) and elemental analysis (c, d, g, h) of rust layers of 1# (a, c, e, g) and 2# (b, d, f, h) steels after corrosion for 144 h (a~d) and 336 h (e~h)
Fig.5  XRD spectra of rust layers of 1# (a) and 2# (b)steels after corrosion for 144 and 336 h
Fig.6  XPS analysis of chemical state of Si element in the rust layer of 2# steel after 336 h corrosion
Fig.7  Tafel curves of 1# (a) and 2# (b) steels after corrosion for different time
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