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Chinese Journal of Materials Research  2016, Vol. 30 Issue (4): 241-247    DOI: 10.11901/1005.3093.2015.507
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Oxygen-concentration Cell Induced Corrosion of E690 Steel for Ocean Platform
XING Pei1, LU Lin1,**(), LI Xiaogang1,2
1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2. Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Cite this article: 

XING Pei, LU Lin, LI Xiaogang. Oxygen-concentration Cell Induced Corrosion of E690 Steel for Ocean Platform. Chinese Journal of Materials Research, 2016, 30(4): 241-247.

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Abstract  

In order to investigate the corrosion resistance of ocean platform steel E690 in sea water, the corrosion induced by oxygen-concentration cell of E690 steel in 3.5%NaCl with oxygen concentration within a range of 0.3 to 8 mg/L was investigated by means of electrochemical measurement techniques, scanning electron microscopy and Raman spectroscopy. The influence of the difference in dissolved oxygen, the ratio of cathode area to anode area and the corrosion product on the corrosion behavior of E690 steel was examined respectively. It was found that: when the ratio of cathode area to anode area was less than four (Sc/a≤4), the cathode and these ratios would be the main factor that influenced the oxygen-concentration cell corrosion; when Sc/a>4, the dissolved oxygen would be the main factor that influenced the oxygen-concentration cell corrosion; How the corrosion product influenced the oxygen-concentration cell corrosion depends on the dissloved oxygen. When the rusted metal under an oxygen-deficient condition, the rust layer would prevent the substrate from corrosion; when the rusted metal was immersed in an aerated condition, the corrosion product would participate in the cathodic reaction process, which would accelerate the anode dissolution and resulted in localized corrosion, such as pitting.
Key words:  materials failure and protection      E690 steel      oxygen concentration cell      area ration between cathode and anode      rust layer      Raman spectroscopy     
Received:  14 September 2015     
ZTFLH:  TG172.4  
Fund: Supported by National Basic Research Program of China No.2014CB643300 and National Environmental Corrosion Platform (NECP)
About author:  To whom correspondence should be addressed, Tel: (010)62333931, E-mail: lulin315@126.com
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Pei XING
Lin LU
Xiaogang LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.507     OR     https://www.cjmr.org/EN/Y2016/V30/I4/241

C Si Mn P S Alt V Cr Ni Cu Mo B Ti
0.095 0.21 1.47 0.009 0.0012 0.0236 0.033 0.45 0.32 0.31 0.46 0.0018 0.015
Table 1  Chemical composition of experimental steels (%, mass fraction)
Fig.1  The equipment of oxygen concentration corrosion cell simulation (1-salt bridge, 2-organic glass cylinder, 3-sealing plastics, 4-saturated calomel electrode, 5-3.5%NaCl, 6-E690 steel)
Fig.2  Microstructure of E690 steels
Fig.3  Potentiodynamic polarization curves of E690 in 3.5%NaCl with different DO (dissolved oxygen) concentration (20℃)
DO/(mg/L) Ecorr/VSCE Icorr/Acm-2 Ba/(V/dec) Bc/(V/dec)
0.3 -0.825 5.04×10-7 0.0319 -0.3803
1 -0.770 2×10-6 0.0473 -0.2894
2 -0.768 2.65×10-6 0.1017 -0.2327
3 -0.752 3.08×10-6 0.1100 -0.2064
6 -0.510 8.61×10-6 0.1002 -0.1428
8 -0.462 9.19×10-6 0.0828 -0.0990
Table 2  Parameters of potentiodynamic polarization curves of E690 in 3.5%NaCl
DO in the two
containers		 Oxygen concentration
difference		 OCP difference
0.3-2 mg/L 1.7 mg/L 54 mV
2-6 mg/L 4 mg/L 95 mV
0.3-6 mg/L 5.7 mg/L 149 mV
0.3-8 mg/L 7.7 mg/L 170 mV
Table 3  Parameters of the oxygen concentration corrosion cells
Fig.4  Influence of area ratio on oxygen concentration corrosion
DO/(mg/L) OCP/V
Rusted sample Unrusted sample
0.3 -0.698 -0.741
6.0 -0.656 -0.556
Table 4  OCP in 3.5%NaCl solution with different dissolved oxygen
The cathode and anode are
respectively in each solution		 The cathode and anode are in the same solution
Group one Group two Group three
Anode Fresh steel
(solution with
0.3 mg/L DO)		 Rusty metal
(solution with
0.3 mg/L DO)		 Rusty metal
(solution with 6.0 mg/L DO)
Cathode Rysty metal
(solution with
6.0 mg/L DO)		 Fresh steel
(solution with
6.0 mg/L DO)		 Fresh steel
(solution with 6.0 mg/L DO)
Table 5  Setting of the three oxygen concentration corrosion cells
Fig.5  Corrosion current-time curves of the oxygen concentration corrosion cell, (a) the first group, (b) the second group, (c) the third group
Fig.6  Corrosion morphology of the anode surface with rust layer (a, c, e) and without rust layer (b, d, f), (a, b) the first group, (c, d) the second group, (e, f) the third group
Fig.7  Raman spectra of the corrosion rusty layer, (a) E690 after potentiostatically anodic polarization, (b) corrosion products on the cathode surface of the first group of oxygen concentration corrosion cell, (c) prefabricated rust layer sample after immersed in solution with full dissolved oxygen
Raman peak frequencies of corrosion products / cm-1 Raman peak frequencies
of standard rust phase / cm-1		 Corrosion products
Corrosion products made
by polarization		 218, 286, 489, 225, 245, 295, 415, 500, 615, α-Fe2O3
328, 406 330, 415, 745 β-FeOOH
Corrosion products on the cathode surface of the oxygenconcentration
corrosion cell		 319, 680 298, 319, 420, 560, 680, 1322 Fe3O4
Corrosion products after immersed in solution 265, 345, 386, 265, 300, 345, 395, 515, 645, 670, 715, γ-Fe2O3
485, 680 248, 303, 397, 485, 554, 680, 1002 α-FeOOH
Table 6  Raman peak frequencies of corrosion products and standard rust phase
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