循环冷却水中2507双相不锈钢微生物腐蚀研究

发布时间：2018-05-13 17:27

本文选题：双相不锈钢 + 循环冷却水　；参考：《表面技术》2015年06期

【摘要】：目的研究2507双相不锈钢在循环冷却水模拟溶液(添加微生物SRB+IOB)中的腐蚀特征,确定其腐蚀机理。方法模拟某炼油厂循环冷却水溶液,采用SEM,EDS和电化学测试等手段分析2507双相不锈钢在SRB+IOB循环冷却水中浸泡不同时间后的腐蚀产物形貌及其电化学腐蚀情况。结果2507双相不锈钢的腐蚀速率很低,属于轻度腐蚀;在循环冷却水模拟溶液中的阳极极化曲线具有明显的钝化区,且钝化膜具有良好的自修复能力;腐蚀倾向随时间增加先增大后减小,腐蚀速率随时间增加先减小后增大。结论 SRB和IOB及其代谢活动与Cl-协同作用是点蚀的主要原因;2507双相不锈钢具有良好的钝化性和耐微生物腐蚀性能。
[Abstract]:Aim to study the corrosion characteristics of 2507 duplex stainless steel in circulating cooling water simulation solution (SRB IOB) and determine its corrosion mechanism. Methods the recirculating cooling water solution of a refinery was simulated. The morphology of corrosion products and electrochemical corrosion of 2507 duplex stainless steel immersed in SRB IOB circulating cooling water for different time were analyzed by means of SEM-EDS and electrochemical measurement. Results the corrosion rate of 2507 duplex stainless steel was very low, and the anodic polarization curve in the simulated solution of circulating cooling water had obvious passivation zone, and the passivation film had good self-repairing ability. The corrosion tendency increases first and then decreases with time, and the corrosion rate decreases first and then increases with time. Conclusion the main reason of pitting corrosion is SRB and IOB, their metabolic activity and the synergistic action of Cl-. The duplex stainless steel has good passivation and resistance to microbial corrosion.
【作者单位】：西安石油大学材料科学与工程学院;
【基金】：国家自然科学基金(51271146)~~
【分类号】：TG172.7;TG142.71

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