Synergistic Effect of SRB and Temperature on Stress Corrosion Cracking of X70 Steel in an ArtificialSea Mud Solution

doi:10.11902/1005.4537.2019.004

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (6): 477-483 DOI: 10.11902/1005.4537.2019.004

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Synergistic Effect of SRB and Temperature on Stress Corrosion Cracking of X70 Steel in an ArtificialSea Mud Solution

CHEN Xu¹(

),MA Jiong¹,LI Xin¹,WU Ming^1,²,SONG Bo²

1. College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China
2. Offshore Oil Engineering Co. , Ltd. , Tianjin 300451, China

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Abstract

The stress corrosion cracking (SCC) behavior of X70 steel in an artificial sea mud solution containing SRB at different temperatures were studied by slow strain rate tensile tests. The results showed that SRB survived in the range of 20~40 ℃ in the artificial sea mud solution. The temperature has a great influence on the SRB activity. The activity and amount of SRB increased with the increase of temperature. The protectiveness of the biofilm formed on X70 steel surface was closely related with the activity and quantity of SRB. The amount of SRB was the least at 20 ℃, which resulted in the lowest SCC sensitivity of X70 steel in the simulated sea mud solution. At 30 ℃, corrosion galvanic cell with large ratio of cathode area to anode area could formed between the biofilm and the steel substrate, while the fracture of X70 steel was the mixed ductile-brittle fracture due to the action of anodic dissolution and hydrogen-induced cracking. The relatively complete biofilm formed on X70 steel at 40 ℃, in that case however, X70 steel exhibited the highest SCC sensitivity and the cracking mechanism was hydrogen induced cracking.

Key words: X70 steel artificial sea mud solution temperature sulfate-reducing bacteria stress corrosion cracking

Received: 08 January 2019

ZTFLH:

TG174.36

Fund: Supported by National Natural Science Foundation of China(51574147);Education Fund Item of Liaoning Province(L2017LZD004)

Corresponding Authors: Xu CHEN E-mail: cx0402@sina.com

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Cite this article:

CHEN Xu,MA Jiong,LI Xin,WU Ming,SONG Bo. Synergistic Effect of SRB and Temperature on Stress Corrosion Cracking of X70 Steel in an ArtificialSea Mud Solution. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 477-483.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.004 OR https://www.jcscp.org/EN/Y2019/V39/I6/477

Fig.1 Schematic diagrams of tensile specimen for SSRT (unit: mm)

Fig.2 Growth curves of SRB in the sea-mud simulation solution at different temperatures

Fig.3 Evolutions of E_corrof X70 steel in the sea-mud simulation solution containing SRB at different temperatures

Fig.4 SSRT curves of X70 steel in the sea-mud simulation solution containing SRB at different temperatures

Fig.5 Elongation and reduction of area of X70 steel in the sea-mud simulation solution containing SRB at different temperatures

Fig.6 SEM images of fracture surfaces (a1~d1) and adjacent side surfaces (a2~d2) of X70 steel in air (a1, a2) and the sea mud simulated solution containing SRB at 20 ℃ (b1, b2), 30 ℃ (c1, c2) and 40 ℃ (d1, d2)

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