直流杂散电流与SRB耦合作用对X52航煤管线钢腐蚀行为的影响

Influence of Coupling of DC Stray Current and SRB on Corrosion Behavior of X52 Jet Coal Pipeline Steel

针对杂散电流及硫酸盐还原菌(SRB)耦合对机坪管网腐蚀行为的复杂作用不明的问题,以X52管线钢为研究对象,采用电化学实验、扫描电镜(SEM)观察、 X射线能谱分析(EDS)等研究了不同直流干扰电压与SRB耦合作用对X52管线钢腐蚀行为的影响。结果表明:直流干扰电压超过5V时会对SRB的生长繁殖造成较大影响,且电压越大,SRB的“稳定期”越短,X52钢腐蚀速率越大。X52钢在含SRB的土壤中的腐蚀速率随直流干扰的电压增大而增大。此外,直流干扰电压的变化会导致X52钢的腐蚀形貌和腐蚀产物类型发生改变。

Aiming at the scientific problem that the mechanism of stray current and sulfate-reducing bacteria(SRB)on the corrosion behavior of apron pipe network is not clear, the influence of different voltage interference and SRB coupling on the corrosion behavior of X52 pipeline steel were studied. Methods such as electrochemical experiments, weightlessness experiments, scanning electron microscopy(SEM), and X-ray energy spectrum analysis(EDS)were applied. The results show that when the DC interference voltage exceeds 5V, it will have a greater impact on the growth and reproduction of SRB, and the "stable period" of SRB decreases with the increase of voltage. On the other hand, the corrosion rate of X52 steel in soil containing SRB increases with the increase of DC interference voltage, In addition, the changes in the magnitude of DC interference voltage cause the changes in the corrosion morphology and types of corrosion products of X52 steel.