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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (5): 461-466    DOI: 10.11902/1005.4537.2014.197
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Corrosion Behavior of 20MnSiCrV Corrosion Resistant Rebar in Chloride Containing Environment
Jianchun ZHANG(),Han MA,Longfei ZUO,Yang LI
Institute of Research of Iron & Steel, Shasteel, Zhangjiagang 215625, China
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Abstract  

Corrosion resistance and corrosion sensitivity to chloride containing environment of 20MnSiCrV steel and 20MnSiV steel was comparatively investigated by salt-spray corrosion test with 3.5%NaCl solution, as well as electrochemical impedance spectroscopy and polarization curve measurements in chloride containing alkaline solutions. The formed corrrosion product scales were characterized by SEM, EPMA and XRD. The results show that the corrosion resistance to Cl- of 20MnSiCrV steel was 1.5 times over that of 20MnSiV steel. The average corrosion rate and depth of corrosion pits of 20MnSiCrV steel were 58% and 74% of those of 20MnSiV steel, respectively. The major components of corrosion products of the two steels were Fe3O4, α-FeOOH and γ-FeOOH. Corrosion scale of 20MnSiCrV steel can be differentiated into an inner layer and an outer layer. The inner layer is enriched in Cr and Si, thereby beneficial to the corrosion resistance of the steel.
Key words:  corrosion resistant rebar      electrochemical impedance spectroscopy      corrosion sensitivity      inner rust layer     
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Jianchun ZHANG
Han MA
Longfei ZUO
Yang LI

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Jianchun ZHANG, Han MA, Longfei ZUO, Yang LI. Corrosion Behavior of 20MnSiCrV Corrosion Resistant Rebar in Chloride Containing Environment. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 461-466.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.197     OR     https://www.jcscp.org/EN/Y2015/V35/I5/461

Steel C Si Mn P S Cr V
20MnSiCrV 0.200 0.640 0.710 0.024 0.004 0.870 0.030
20MnSiV 0.210 0.490 1.440 0.019 0.007 --- 0.028
Table 1  Chemical compositions of two steels
Fig.1  Polarization curves of two steels in saturated Ca(OH)2 solutions without Cl- (a), and with 0.2 mol/L (b), 0.4 mol/L

(c) and 0.6 mol/L (d) Cl-

Fig.2  Polarization curves of two steels in 3.5%NaCl solution after immersion for different time
Fig.3  EIS of two steels in 3.5%NaCl solution after immersion for different time
Fig.4  Mass gains of two steels after salt-spray corrosion test
Fig.5  Depths of etch pits of two steels after salt-spray corrosion test
Fig.6  Surface morphologies of CR (a) and LC (b) steels after 168 h salt-spray corrosion test
Fig.7  Cross section morphologies of corrosion layers formed on CR (a) and LC (b) steels after 168 h salt-spray corrosion test
Fig.8  XRD spectra of CR (a) and LC (b) steels after salt-spray corrosion test
Fig.9  Cross section image and corresponding element mappings of corrosion layer formed on CR steel after salt-spray corrosion test
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