Microstructure and Properties of Seawater Corrosion Resistant Rebar Steel 00Cr10MoV

doi:10.11902/1005.4537.2015.167

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (4): 363-369 DOI: 10.11902/1005.4537.2015.167

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Microstructure and Properties of Seawater Corrosion Resistant Rebar Steel 00Cr10MoV

Jianchun ZHANG¹(

),Longfei ZUO¹,Jinyang JIANG²,Han MA¹,Dan SONG²

1. Institute of Research of Iron & Steel, Shasteel, Zhangjiagang 215625, China
2. School of Material Science and Engineering, Southeast University, Nanjing 211189, China

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Abstract

The microstructure and mechanical properties of the seawater corrosion resistant rebar steel 00Cr10MoV was investigated, while its corrosion resistance was studied by salt-spray test, periodical immersion test, electrochemical impedance spectroscopy and polarization curve measurements. The results show that the microstructure of 00Cr10MoV composed of ferrite and bainite with yield strength above 400 MPa. Compared with 20MnSiV, 00Cr10MoV had excellent corrosion resistance in simulated marine environment. The charge-transfer resistance of 00Cr10MoV was 1.37×10⁵ Ωcm², 100 times more than 20MnSiV. Its corrosion products consist of major phases α-FeOOH, β-FeOOH and γ-FeOOH, minor phase Fe₃O₄and trace phases Na₃CrCl₁₆ and Fe+3O(OH, Cl).

Key words: seawater corrosion resistant rebar microstructure periodical immersion test electrochemical impedance spectroscopy

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	Jianchun ZHANG
	Longfei ZUO
	Jinyang JIANG
	Han MA
	Dan SONG

Cite this article:

Jianchun ZHANG,Longfei ZUO,Jinyang JIANG,Han MA,Dan SONG. Microstructure and Properties of Seawater Corrosion Resistant Rebar Steel 00Cr10MoV. Journal of Chinese Society for Corrosion and protection, 2016, 36(4): 363-369.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.167 OR https://www.jcscp.org/EN/Y2016/V36/I4/363

Table 1 Chemical compositions of two tested steels (mass fraction/ %)

Table 2 Mechanical properties of 00Cr10MoVrebar

Fig.1 Microstructures of the center (a) and R/4 region from the surface (b) for 00Cr10MoV rebar

Fig.2 SEM image of 00Cr10MoV rebar (a) and corresponding EPMA maps of Cr (b), Mo (c) and Mn (d)

Fig.3 Corrosion rates of two tested rebars in differentcorrosion conditions

Fig.4 Corrosion morphologies of 20MnSiV (a, b) and 00Cr10MoV (c, d) rebars before (a, c) and after(b, d) removal of corrosion products formed after 360 h salt-spray test

Fig.5 Corrosion morphologies of 20MnSiV (a, b) and00Cr10MoV (c, d) rebars before (a, c) and after(b, d) removal of corrosion products formed after 360 h periodical immersion test

Fig.6 XRD spectra of the corrosion products of 20MnSiV(a) and 00Cr10MoV (b) rebars after 360 h periodical immersion test

Fig.7 Polarization curves of 20MnSiV and 00Cr10MoVrebars

Fig.8 Nyquist (a), impedance module (b) and phase angle (c) plots and fitted curves of 20MnSiV and 00Cr10MoV steels

Fig.9 Equivalent circuit for EIS

Table 3 Fitting data of EIS of 20MnSiV and00Cr10MoV steels

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