Effect of Applied Potential on Stress Corrosion Behavior of X80 Pipeline Steel and Its Weld Joint in a Simulated Liquor of Soil at Lunnan Area of Xinjiang

doi:10.11902/1005.4537.2019.118

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (4): 325-331 DOI: 10.11902/1005.4537.2019.118

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Effect of Applied Potential on Stress Corrosion Behavior of X80 Pipeline Steel and Its Weld Joint in a Simulated Liquor of Soil at Lunnan Area of Xinjiang

ZHU Lixia¹^,²(

), JIA Haidong³, LUO Jinheng¹, LI Lifeng¹, JIN Jian³, WU Gang¹, XU Congmin⁴

1. State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi'an 710077, China
2. School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
3. PetroChina West Pipeline Company, Urumchi 830013, China
4. School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

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Abstract

The stress corrosion cracking (SCC) behavior of X80 pipeline steel and its weld joint in a simulated liquor of soil at Lunnan area of Xinjiang was studied by means of slow strain rate tensile tests (SSRT), SEM observation and potentiodynamic polarization tests. The results showed that both the X80 pipeline steel and its weld joint have obvious SCC susceptibilities, and the mode of fracture cracking propagation is transgranular cracking (TGSCC) under different applied potentials, and the SCC susceptibility of the weld seam is higher than that of the base metal under the same applied potential. SCC susceptibility and mechanism would vary with the applied potential. At -500 mV, the SCC of both X80 steel and its weld joint may be ascribed to the synergistic action of the anodic dissolution (AD) at crack tip and the rupture of passivation film. The SCC susceptibility of X80 pipeline steel increased markedly for potentials below -800 mV (-850, -1000 and -1500 mV) due to a strong hydrogen embrittlement (HE) effect on SCC process and hydrogen induced cracking promoted by cathodic hydrogen evolution reaction.

Key words: X80 pipeline steel stress corrosion cracking applied potential soil environment corrosion mechanism

Received: 03 August 2019

ZTFLH:

TG172.4

Fund: National Key R&D Project(2016YFC0801204);Natural Science Foundation of Shaanxi Province(2019JQ-937)

Corresponding Authors: ZHU Lixia E-mail: zhulx@cnpc.com.cn

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	Lixia ZHU
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Cite this article:

ZHU Lixia, JIA Haidong, LUO Jinheng, LI Lifeng, JIN Jian, WU Gang, XU Congmin. Effect of Applied Potential on Stress Corrosion Behavior of X80 Pipeline Steel and Its Weld Joint in a Simulated Liquor of Soil at Lunnan Area of Xinjiang. Journal of Chinese Society for Corrosion and protection, 2020, 40(4): 325-331.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.118 OR https://www.jcscp.org/EN/Y2020/V40/I4/325

Fig.1 Diagram of sample for SSRT

Fig.2 Strain-stress curves of X80 steel at different potential: (a) base metal, (b) weld joint

Fig.3 I_ψ of X80 base metal and weld joint

Fig.4 Microfracture surface morphologies of X80 steel at different potential: (a1) base metal in air; (a2) weld joint in air; (b1) base metal, -500 mV; (b2) weld joint, -500 mV; (c1) base metal, -850 mV; (c2) weld joint, -850 mV; (d1) base metal, -1000 mV; (d2) weld joint, -1000 mV; (e1) base metal, -1500 mV; (e2) weld joint, -1500 mV

Fig.5 Secondary cracks morphologies of X80 steel side surfaces at different potential: (a1) base metal in air; (a2) weld joint in air; (b1) base metal, -500 mV; (b2) weld joint, -500 mV; (c1) base metal, -850 mV; (c2) weld joint, -850 mV; (d1) base metal, -1000 mV; (d2) weld joint, -1000 mV; (e1) base metal, -1500 mV; (e2) weld joint, -1500 mV

Fig.6 Polarization curve of X80 steel in simulated soil solution: (a) base metal; (b) weld joint

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