STRESS CORROSION BEHAVIORS OF E690 HIGH-STRENGTH STEEL IN SO2-POLLUTED MARINE ATMOSPHERE

doi:10.11900/0412.1961.2015.00362

Acta Metall Sin

2016, Vol. 52

Issue (3): 331-340 DOI: 10.11900/0412.1961.2015.00362

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STRESS CORROSION BEHAVIORS OF E690 HIGH-STRENGTH STEEL IN SO₂-POLLUTED MARINE ATMOSPHERE

Hongchi MA¹,Cuiwei DU¹,Zhiyong LIU¹(

),Wenkui HAO¹,Xiaogang LI^1,²,Chao LIU¹

1 Key Laboratory for Corrosion and Protection, Ministry of Education, 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

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Hongchi MA, Cuiwei DU, Zhiyong LIU, Wenkui HAO, Xiaogang LI, Chao LIU. STRESS CORROSION BEHAVIORS OF E690 HIGH-STRENGTH STEEL IN SO₂-POLLUTED MARINE ATMOSPHERE. Acta Metall Sin, 2016, 52(3): 331-340.

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Abstract

With the development of industry, the atmosphere in many cities along the coastal lines such as Qingdao in China has been polluted with SO₂, and has been changed to coastal-industrial atmosphere with the co-existence of SO₂ and Cl^-. The corrosion and stress corrosion cracking (SCC) behavior and mechanism of steel in this environment is different from that in the coastal atmosphere containing only Cl^- or the industrial atmosphere containing only SO₂. Previous study have indicated that SO₂ in the marine atmosphere can greatly promote the stress corrosion cracking of high-strength steel due to acidification of thin electrolyte layer and reproduction of H⁺ through FeSO₄. E690 steel, as a newly-developed high strength steel, is very promising to be widely used in offshore platform in the near future for its excellent performance. However, there is few research about its SCC behavior in marine atmosphere, especially in SO₂-polluted atmosphere. Therefore, it's of great importance to investigate the SCC behavior and mechanism of E690 steel in this environment. In this work, U-bend specimen corrosion test under dry/wet cyclic condition, electrochemical measurements, crack morphology observation and rust layer analysis, were conducted to investigate the effect of SO₂ on SCC behavior of E690 steel in simulated SO₂-polluted marine atmosphere. The results indicated that E690 steel has a high SCC susceptibility in SO₂-polluted marine atmosphere with a combined mechanism of anodic dissolution (AD) and hydrogen embrittlement (HE). SO₂ in the atmosphere can facilitate the densification of inner rust layer by promoting the formation of α-FeOOH and enrichment of Ni and Cr in the inner rust layer, leading to the concentration of Cl^- under the rust layer, which may result in the initiation and propagation of SCC cracks significantly and therefore enhance the SCC susceptibility.

Key words: E690 high-strength steel SO2-polluted marine atmosphere stress corrosion cracking thin electrolyte layer dry/wet cyclic corrosion

Received: 09 July 2015

Fund: Supported by National Basic Research Program of China (No.2014CB643300), National Natural Science Foundation of China (Nos.51471034, 51131005 and 51171025), National Environmental Corrosion Platform (NECP) and Beijing Higher Education Young Elite Teacher Project

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	Hongchi MA
	Cuiwei DU
	Zhiyong LIU
	Wenkui HAO
	Xiaogang LI
	Chao LIU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00362 OR https://www.ams.org.cn/EN/Y2016/V52/I3/331

Fig.1 OM (a) and SEM (b) images of E690 steel

Fig.2 Macro-morphology of U-bend specimen

Fig.3 Schematic of cutting for cross-section of U-bend specimen

Fig.4 Nyquist plots of EIS of E690 steel after different periods of cyclic corrosion test (CCT)

Fig.5 Potentiodynamic polarization curves of E690 steel after different periods of CCT (E--potential, i--current density)

Fig.6 Dependence of corrosion potential (E_corr) and corrosion current density (i_corr) on CCT time

Fig.7 Macro-morphologies of U-bend specimen after CCT periods of 5 d (a), 10 d (b), 20 d (c), 30 d (d), 40 d (e), 60 d (f) and 90 d (g)

Fig.8 Morphologies of corrosion product of U-bend specimen after CCT periods of 5 d (a), 10 d (b), 20 d (c), 30 d (d), 40 d (e), 60 d (f) and 90 d (g)

Fig.9 Micro-morphologies of U-bend specimen surface after CCT periods of 5 d (a), 10 d (b), 20 d (c), 30 d (d), 40 d (e), 60 d (f) and 90 d (g) (Insets show the high magnified images)

Fig 10 Cracking morphologies of E690 steel in thin electrolyte layer containing SO2 for 30 d (a), 40 d (b), 60 d (c) and 90 d (d)

Fig 11 Dependence of Crack depth on CCT time in thin electrolyte layer with and without SO2[18]

Fig 12 EDS analysis of corrosion product of E690 steel after 90 d of CCT

Fig 13 XRD spectra of corrosion product of E690 steel after ifferent periods of CCT

Fig 14 EDS map distributions of alloying elements in the cross section of rust layer for 10 d (a) and 90 d (b)

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