Corrosion Evolution Characteristics of Q235B Steel in O3/SO2 Composite Atmosphere

doi:10.11902/1005.4537.2020.125

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (4): 450-460 DOI: 10.11902/1005.4537.2020.125

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Corrosion Evolution Characteristics of Q235B Steel in O₃/SO₂ Composite Atmosphere

CHEN Wenjuan¹^,², FANG Lian³, PAN Gang³^,⁴(

)

^1.Engineering Research Center of High Performance Copper Alloy Materials and Processing, Ministry of Education, Hefei University of Technology, Hefei 230601, China
^2.Postdoctoral Research Station, School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
^3.Foundation Department of Xuancheng Campus, Hefei University of Technology, Xuancheng 242000, China
^4.Anhui Province Key Laboratory of Industry Safety and Emergency Technology, Hefei University of Technology, Hefei 230601, China

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Abstract

The corrosion evolution characteristics of Q235B steel in O₃/SO₂ containing composite atmosphere was examined by means of a simulation of dry/wet cyclic corrosion test, electrochemical impedance spectroscopy (EIS) and polarization curves measurements, as well as X-ray diffractometer (XRD) and 3D laser measurement microscope. The results show that the synergistic effect of O₃ and SO₂ can obviously inhibit the corrosion of Q235B steel. When the concentration of Na₂SO₃ in the simulated environment is 0.01 mol/L, the corrosion rate of Q235B steel in the simulated O₃/SO₂ containing composite atmosphere increases rapidly and then decreases slowly. When the concentration of Na₂SO₃ in the simulated environment is 0.05 mol/L, the corrosion rate of Q235B steel increases slowly and then decreases rapidly. When the concentration of Na₂SO₃ in the simulated atmosphere is 0.10 mol/L, the corrosion rate of Q235B steel increases first and then decreases slowly. Compared with the atmosphere without O₃, when the content of SO₂ in the simulated atmosphere is lower, the synergistic effect of O₃ and SO₂ will promote the formation of α-FeOOH. When the content of SO₂ in the atmosphere is higher, the effect of O₃ on the phase composition of the corrosion products is not obvious.

Key words: Q235B steel O₃ atmospheric corrosion corrosion product

Received: 17 July 2020

ZTFLH:

TG172.3

Fund: Fundamental Research Funds for the Central Universities of China(PA2020GDSK0078);Fundamental Research Funds for the Central Universities(PA2020GDGP0054);Poverty alleviation and Rural Revitalization Strategy Research Project of Hefei University of Technology(JS2020HGXJ0102)

Corresponding Authors: PAN Gang E-mail: dagang@hfut.edu.cn

About author: PAN Gang, E-mail: dagang@hfut.edu.cn

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Cite this article:

CHEN Wenjuan, FANG Lian, PAN Gang. Corrosion Evolution Characteristics of Q235B Steel in O₃/SO₂ Composite Atmosphere. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 450-460.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.125 OR https://www.jcscp.org/EN/Y2021/V41/I4/450

Table 1 Na₂SO₃ concentration and the O₃ content for simulating atmospheres

Fig.1 Corrosion mass gain results of Q235B steel with prolonged CCT number in simulated atmospheres: (a) 1# sample, (b) 2# sample, (c) 3# sample

Fig.2 Calculated instantaneous corrosion rate result of low carbon steel with prolonged CCT number in simulated atmospheres: (a) 1# sample, (b) 2# sample, (c) 3# sample

Fig.3 XRD patterns of the powdered rust Q235B steel after 30 CCT in the simulated atmospheres: (a) 1# sample, (b) 2# sample, (c) 3# sample

Fig.4 Polarization curves of rusted Q235B steel samples in simulated atmospheres as a function of the CCT number: (a1, a2) 1# sample, (b1, b2) 2# sample, (c1, c2) 3# sample

Fig.5 Polarization resistance of the Q235B steel in the simulated atmospheres as a function of the CCT number: (a) 1# sample, (b) 2# sample, (c) 3# sample

Fig.6 Imperdace module (a1~f1) and phase angle (a2~f2) plots of the EIS results for the rusted Q235B steel samples as a function of the CCT number in the simulated atmospheres: (a1, a2) #1-1 sample, (b1, b2) #1-2 sample, (c1, c2) #2-1 sample, (d1, d2) #2-2 sample, (e1, e2) #3-1 sample, (f1, f2) #3-2 sample

Fig.7 Equivalent electrical circuit for the EIS of rusted Q235B steel in the simulated atmospheres

Fig.8 Evolution of the parameters of R_r (a1~c1), R_ct (a2~c2) and Y_w (a3~c3) obtained from the EIS data for Q235B steel samples in the simulated atmospheres as a function of the cyclic number: (a1~a3) 1# sample, (b1~b3) 2# sample, (c1~c3) 3# sample

Fig.9 3D laser micrograph of #1-1 sample (a1~c1), #1-2 sample (a2~c2), #2-1 sample (a3~c3), #2-2 sample (a4~c4), #3-1 sample (a5~c5) and #3-2 sample (a6~c6) Q235B steel surface corroded by 2 CCT (a1~a6), 10 CCT (b1~b6) and 30 CCT (c1~c6) in simulated

Fig.10 Surface roughness of Q235B steel surface corroded with prolonged CCT number in simulated atmosphere: (a) 1# sample, (b) 2# sample, (c) 3# sample

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