温度和硫酸盐还原菌(SRB)协同作用下X80钢的腐蚀行为

Effects of temperature and SRB on corrosion behavior of X80 pipeline steel

通过利用线性极化曲线,交流阻抗技术(EIS),并结合使用扫描电子显微镜观察研究了不同温度下SRB对X80管线钢在大港土壤模拟溶液中的腐蚀行为的影响,实验结果表明:SRB会加剧X80管线钢在大港土壤溶液中的腐蚀,当SRB活性受不同温度影响时,其对X80管线钢腐蚀行为产生不同影响。当外界环境温度为30℃时,SRB活性较强,生物膜中细胞密度高,其致密性增加,加速了金属的电化学腐蚀速率。当外界环境温度为50℃时,SRB的活性较低,在金属表面形成的生物膜致密性较差,此时在含SRB模拟溶液与无菌模拟溶液中,X80管线钢所呈现出的电化学腐蚀速率基本一致,且小于30℃时含SRB模拟溶液中的腐蚀速率。

The effect of SRB on the corrosion behavior of X80 pipeline steel in Dagang soil simulated solution at different temperatures was studied by using linear polarization curve, electrochemical impedance spectroscopy(EIS) and scanning electron microscope. The experimental results show that SRB can aggravate the corrosion of X80 pipeline steel in Dagang soil simulation solution. And it has different effects on it when the SRB activity is affected by different temperatures. When the ambient temperature is 30 ℃, the SRB activity is strong, the cell density in the biofilm is high, and its compactness increases, which accelerates the electrochemical corrosion rate of metals. When the ambient temperature is 50 ℃, the activity of SRB is low and the compactness of the biofilm formed on the metal surface is poor. In this situation, the electrochemical corrosion rate of X80 pipeline steel is basically same as that in aseptic soil simulated solution. And the corrosion rate in simulated solution containing SRB is less than 30 ℃.