地下咸水阴离子协同作用对316L不锈钢耐蚀性能的影响

发布时间：2018-03-31 21:43

本文选题：地下咸水　切入点：阴离子协同作用　出处：《材料导报》2015年04期

【摘要】：滨海地区地下咸水对地源热泵换热系统中不锈钢材料的腐蚀十分严重。采用动电位极化扫描和电化学阻抗谱等方法研究了模拟咸水中不同阴离子协同作用下316L不锈钢的腐蚀行为。结果表明:随着Cl-浓度的增加,316L不锈钢耐蚀性降低。SO42-与Cl-协同作用时,高浓度的SO42-抑制了Cl-对316L不锈钢表面膜的破坏,增强其耐蚀性,低浓度的SO42-则降低其耐蚀性;而HCO3-与Cl-的协同作用对316L不锈钢耐蚀性影响的规律与之相反。当这3种阴离子共存时,其协同作用加速了316L不锈钢的腐蚀。这为不同地下水环境条件下地源热泵系统的选材提供了参考。
[Abstract]:The corrosion of stainless steel in ground-source heat pump heat transfer system by underground salt water in coastal area is very serious. Using potentiodynamic polarization scanning and electrochemical impedance spectroscopy, the influence of different anions on 316L in simulated salt water was studied by means of potentiodynamic polarization scanning and electrochemical impedance spectroscopy. Corrosion behavior of rusty steel. The results show that with the increase of Cl-concentration, the corrosion resistance of stainless steel, I. E. so _ 42-, decreases with the increase of Cl-concentration. High concentration of so _ 42- inhibited the destruction of the surface film of 316L stainless steel and enhanced its corrosion resistance, while the low concentration of so _ 42- decreased its corrosion resistance. However, the synergistic effect of HCO3- and Cl- on corrosion resistance of 316L stainless steel is contrary to that of HCO3- and Cl-. When the three anions coexist, The synergistic effect accelerates the corrosion of 316L stainless steel, which provides a reference for the selection of materials for ground-source heat pump system under different groundwater environment.
【作者单位】：中国海洋大学海洋环境与生态教育部重点实验室;青岛市海润自来水集团有限公司;建设综合勘察研究设计院有限公司;
【基金】：国家科技支撑计划(2013BAJ09B04)
【分类号】：TG172.5;TG142.71

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