Effect of Sulfate⁃Reducing Bacteria on Corrosion of 20# Steel under CaCO3 Scale

doi:10.3969/j.issn.1672-6952.2022.04.004

Abstract

Abstract:

The influence of sulfate reducing bacteria (SRB) and CaCO₃ scale layer on the corrosion behavior of 20^# steel was studied by laboratory simulation experiment. The uniform corrosion rate was studied by corrosion weight loss method.The corrosion electrochemical behavior of 20^# steel in the injected aqueous solution was studied by electrochemical impedance spectroscopy (EIS) and open circuit potential (OCP). The morphology and composition of corrosion products on the surface of 20^# steel were analyzed by scanning electron microscopy (SEM), EDS and Raman spectroscopy. The pitting pit depth of 20^# steel was analyzed by laser confocal microscopy (CLSM). The results show that there is a synergistic effect between SRB and CaCO₃ scale layer. The porosity of CaCO₃ scale layer and the anaerobic environment under the scale layer provide convenient conditions for the adhesion and growth of SRB. The inoculation of SRB can promote the uniform corrosion and local corrosion of 20^# steel under the CaCO₃ scale layer.

Key words: Corrosion, Sulfate?reducing bacteria (SRB), CaCO₃scale layer, 20^# steel, Water injection system

摘要：

采用室内模拟实验的方法，研究了硫酸盐还原菌（SRB）和CaCO₃垢层共存对20号钢腐蚀行为的影响。通过腐蚀失重法研究平均腐蚀速率，通过电化学阻抗谱（EIS）和开路电位（OCP）研究注入水溶液中20号钢腐蚀电化学行为，利用扫描电镜（SEM）、EDS和Raman光谱分析20号钢表面腐蚀产物的形貌和成分，采用激光共聚焦显微镜（CLSM）分析20号钢的点蚀坑深度。结果表明，SRB与CaCO₃垢层存在协同作用，CaCO₃垢层的孔隙率和垢层下的厌氧环境为SRB的黏附和生长提供了便利的条件，接种SRB对CaCO₃垢层下20号钢的均匀腐蚀和局部腐蚀均有促进作用。

关键词: 腐蚀, 硫酸盐还原菌（SRB）, CaCO₃垢层, 20号钢, 注水系统

CLC Number:

TE98

Dongbo Li, Mei Dong, Shengnan Du, Maocheng Yan, Weiqiang Wang. Effect of Sulfate⁃Reducing Bacteria on Corrosion of 20^# Steel under CaCO₃ Scale[J]. Journal of Liaoning Petrochemical University, 2022, 42(4): 17-24.

李东博, 董美, 杜胜男, 闫茂成, 王卫强. 硫酸盐还原菌对CaCO₃垢层下20号钢腐蚀的影响[J]. 辽宁石油化工大学学报, 2022, 42(4): 17-24.

Figures/Tables 16

References 27

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元素	质量分数
C	0.220
Si	0.220
Mn	0.510
S	0.028
P	0.012

元素	质量分数
C	0.220
Si	0.220
Mn	0.510
S	0.028
P	0.012

组分	质量浓度
NaCl	24.530
Na₂SO₄	4.090
CaCl₂	1.232
NaHCO₃	0.964
MgCl₂	0.764

组分	质量浓度
NaCl	24.530
Na₂SO₄	4.090
CaCl₂	1.232
NaHCO₃	0.964
MgCl₂	0.764

区域	质量分数/%
区域	C	O	P	S	Fe	Ca
A	9.01	2.55	—	—	88.08	0.36
B	12.87	11.70	2.87	15.57	56.06	0.93
C	12.95	25.73	—	—	3.96	57.36
D	11.41	12.90	2.73	8.10	40.07	24.79

Effect of Sulfate⁃Reducing Bacteria on Corrosion of 20^# Steel under CaCO₃ Scale

硫酸盐还原菌对CaCO₃垢层下20号钢腐蚀的影响

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Figures/Tables 16

References 27

Related Articles 15

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Metrics

时间/d	R_s/ （Ω•cm²）	Y_f×10²/ （S•s ⁿ •cm^-2）	n_f	R_f	Y_dl×10²/ （S•s ⁿ •cm^-2）	n_dl	R_ct/ （Ω•cm²）	R_p/ （Ω•cm²）
1	9.030	0.164	0.856 7	6 189.000	0.408	0.552 5	6.687	6 195.687
3	7.839	3.902	0.800 0	26.668	0.780	0.964 3	5 380.000	5 406.688
5	6.845	1.608	0.951 7	4 863.000	3.871	0.545 6	3.983	4 866.983
7	6.733	4.980	0.512 7	4.516	1.538	0.937 4	4 513.000	4 517.516
9	6.546	1.503	0.930 8	3 987.000	5.520	0.501 7	4.484	3 991.484
11	6.500	1.458	0.915 6	3 490.000	6.880	0.461 3	4.571	3 494.571
15	6.723	8.381	0.435 8	4.454	1.406	0.906 7	3 056.000	3 060.454

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