不同Cl^(-)浓度下SRB对抗微生物腐蚀管材性能的影响

Effect of SRB on Microbial Anti⁃corrosion Pipes under Different Cl-Concentration

针对油田复杂环境下管材发生腐蚀失效问题,采用SEM、EDS及XRD对试样在不同Cl^(-)浓度下(0 g/L、20 g/L、40 g/L、80 g/L和120 g/L)腐蚀后的表面形貌、腐蚀产物的成分及物相组成进行分析,通过电化学测试,研究了不同Cl^(-)浓度下SRB对抗微生物腐蚀管材性能的影响。结果发现,Cl^(-)浓度为20 g/L时最适宜SRB生长,但此时SRB对抗微生物腐蚀管材的腐蚀性最小,此后随着Cl^(-)浓度升高,生物膜减少,腐蚀速率增大;当Cl^(-)浓度分别为0 g/L、20 g/L时,在腐蚀产物中检测出FeS和Fe_(3)(PO_(4))_(2),且腐蚀均受阴极反应控制。因此,在不同Cl^(-)浓度下,SRB对抗微生物腐蚀管材性能的影响与试样表面形成的生物膜有关,随着Cl^(-)浓度的增加,SRB对抗微生物腐蚀管材腐蚀作用减小。

In response to of corrosion failure on pipes in complex oilfield environments,SEM,EDS,and XRD were used to analyze the surface morphology,composition of corrosion products,and phase composition of the samples after corrosion at different Cl^(-)concentrations(0 g/L,20 g/L,40 g/L,80 g/L,and 120 g/L).The electrochemical test was used to study the effect of SRB on microbial anti-corrosion resistant pipe under different Cl^(-).When the of Cl^(-)is 20 g/L,the growth of SRB is the most suitable,but the corrosion of SRB to microbial anti-corrosion resistant pipe is the least.With the increase of Cl^(-),the biofilm decreased and the corrosion rate increased.When the Cl^(-)was 0 g/L and 20 g/L,FeS and Fe_(3)(PO_(4))_(2) were detected in the corrosion products,and the corrosion was controlled by cathodic reactions.Therefore,at different Cl^(-)concentrations,the effect of SRB on the performance of microbial anti-corrosion resistant pipes is related to the biofilm formed on the surface of the sample.As the Cl^(-)concentration increases,the corrosion resistance of SRB on microbial anti-corrosion resistant pipes decreases.