Effect of HCO3- on Stress Corrosion Cracking Behavior of X90 Pipeline Steel

doi:10.11902/1005.4537.2020.166

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (5): 727-731 DOI: 10.11902/1005.4537.2020.166

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Effect of HCO₃^- on Stress Corrosion Cracking Behavior of X90 Pipeline Steel

GONG Ke¹^,², WU Ming¹^,²(

), ZHANG Sheng¹

^1.College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266555, China
^2.College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

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Abstract

The effect of the variation of HCO₃^- concentration in an artificial soil solution, which aims to simulate the liquid of the soil nearby a pipeline situated at Shenyang area, on the stress corrosion cracking behavior of high-strength X90 pipeline steel was systematically studied. The results show that the corrosion rate of X90 steel increases first and then decreases with the increase of HCO₃^- concentration. The variation of HCO₃^- concentration on the corrosion rate of X90 pipeline steel may be ascribed to that the protective properties of the formed passive film may alter with the varying HCO₃^- concentration. When the HCO₃^- concentration of the solution is 7%, the protectiveness on of the passive film is the weakest, and the electrochemical corrosion rate of X90 pipeline steel is the fastest.

Key words: HCO₃^- X90 pipeline steel passive film shenyang soil

Received: 21 September 2020

ZTFLH:

TG172

Corresponding Authors: WU Ming E-mail: wuming_0413@sina.com

About author: WU Ming, E-mail: wuming_0413@sina.com

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Cite this article:

GONG Ke, WU Ming, ZHANG Sheng. Effect of HCO₃^- on Stress Corrosion Cracking Behavior of X90 Pipeline Steel. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 727-731.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.166 OR https://www.jcscp.org/EN/Y2021/V41/I5/727

Fig.1 Polarization curves of X90 pipeline steel with differ-ent concentrations of HCO₃^-

Fig.2 Relation curve between HCO₃^- concentration and corrosion potential E_coor of X90 pipeline steel

Fig.3 X90 pipeline steel electrochemical impedance in shenyang soil simulation solution with different concentration of HCO₃^-

Fig.4 X90 pipeline steel equivalent circuit diagram of AC impedance map in shenyang soil simulation solution for 1%, 3% and 5%HCO₃^- (a) and 7% and 9% HCO₃^- (b)

Table 1 AC impedance curve fitting parameters of X90 pipeline steel in shenyang soil simulation solution with concentrations of 1%, 3% and 5%HCO₃^-

Table 2 AC impedance curve fitting parameters of X90 pipeline steel in shenyang soil simulation solution with concentration of 7% and 9%HCO₃^-

Fig.5 SSRT curves of X90 pipeline steel in Shenyang soil simulation solution with different concentrations of HCO₃^-

Fig.6 Macroscopic fracture morphologies (a1~e1), microscopic fracture morphologies (a2~e2) and side fracture morphologies (a3~e3) of SSRT of 90X pipeline steel in Shenyang soil simulation solution with different concentrations of HCO₃^-

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