Effect of pH Value on Microbial Corrosion Behavior of X70 Steel in a Sea Mud Extract Simulated Solution

doi:10.11902/1005.4537.2017.213

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (6): 565-572 DOI: 10.11902/1005.4537.2017.213

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Effect of pH Value on Microbial Corrosion Behavior of X70 Steel in a Sea Mud Extract Simulated Solution

Xin LI,Xu CHEN,Wuqi SONG,Jiaxing YANG,Ming WU(

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1. College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China

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Abstract

The effect of pH value on the corrosion behavior of X70 steel in an artificial liquid containing sulfate-reducing bacteria (SRB) was investigated by means of potentiondynamic polarization, electrochemical impedance spectroscopy (EIS). The artificial liquid aims to simulate a sea mud extract, while the very sea mud was collected from the shallow seabed from off shore at Sanya of Hainan Island. The results show that the pH value of the simulated solution can affect the growth of SRB, and thus further affect the corrosion behavior of X70 steel. The solution with pH=8 is the best environment for SRB growth, pH=6 is the next and pH=10 is the worst. The SRB growth phase by pH=8 can be divided into three phases: logarithmic growth-, stable growth- and decay-phase. SRB growth phase by pH=6 and pH=10 can be divided into two phases: logarithmic growth- and decay-phase. In the logarithmic growth phase, the number of SRB is less and the effect of microbial corrosion is weak, therefore theE_corrof X70 is higher. However, when the number of SRB increases, the effect of microbial corrosion becomes serious, while the formed biofilm is loose and easy to fall off, which result in serious local corrosion, thereby theE_corrgradually decreases. In the simulated solution with pH=8 the effect of microbial corrosion is highest, which results further in the fastest corrosion rate of the steel. In the simulated solution with pH=10, the effect of microbial corrosion is weak, thus the passivation film can form easily on the steel surface, therefore, results in the slowest corrosion rate of the steel.

Key words: X70 steel sea mud simulation solution pH value sulfate-reducing bacteria microbial corrosion

Received: 18 December 2017

ZTFLH:

TG174.36

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

Corresponding Authors: Ming WU E-mail: wuming0413@163.com

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Cite this article:

Xin LI,Xu CHEN,Wuqi SONG,Jiaxing YANG,Ming WU. Effect of pH Value on Microbial Corrosion Behavior of X70 Steel in a Sea Mud Extract Simulated Solution. Journal of Chinese Society for Corrosion and protection, 2018, 38(6): 565-572.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.213 OR https://www.jcscp.org/EN/Y2018/V38/I6/565

Fig.1 Growth curves of SRB in the South China Sea mud simulation solutions with different pH values

Fig.2 E_corrcurves of X70 steel in the South China Sea mud simulation solutions containing SRB at different pH values

Fig.3 Polarization curves of X70 steel after immersion in the South China Sea mud simulation solutions containing SRB at different pH values for 4 d (a), 7 d (b), 10 d (c) and 14 d (d)

Fig.4 Corrosion current densities of X70 steel in the South China Sea mud simulation solutions containing SRB at different pH values

Fig.5 Diagrammatic representation of corrosive effect of SRB

Fig.6 Nyquist (a1~d1) and Bode (a2~d2) plots of X70 steel after immersion in the South China Sea mud simulation solutions containing SRB at different pH values for 4 d (a1, a2), 7 d (b1, b2), 10 d (c1, c2) and 14 d (d1, d2)

Fig.7 Equivalent circuit of EIS for X70 steel after immer-sion in the South China Sea mud simulation soluti-ons containing SRB at different pH values

Table 1 Fitting data of EIS of X70 steel after immersion in the South China Sea mud simulation solutions containing SRB at different pH values

Fig.8 R_pcurves of X70 steel in the South China Sea mud simulation solutions containing SRB at different pH values

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