输水环境下水泥砂浆-球墨铸铁管腐蚀过程电化学测试
发布时间：2018-08-06 11:54
【摘要】：该文针对输水条件下水泥砂浆-球墨铸铁管的腐蚀问题,设计制作了内衬水泥砂浆球墨铸铁管环试件,进行纯净水、6M硝酸铵溶液和6M氯化铵溶液扰动侵蚀下的管环试件线性极化电阻(LPR)和电化学阻抗谱(EIS)测试,分析了不同溶液中试件的线性极化电阻、腐蚀电流密度等电化学参数随腐蚀时间的变化规律,并评估了各试件在不同溶液中的腐蚀程度。结果表明,在120天的腐蚀时间内,纯净水中试件的砂浆层电阻、铸铁表面电荷转移电阻和腐蚀电流密度基本不变;硝酸铵溶液中,试件的砂浆层电阻下降明显,但铸铁表面电荷转移电阻和腐蚀电流密度基本不变;而在氯化铵溶液中,试件砂浆层电阻和铸铁表面电荷转移电阻均降低明显,且腐蚀电流密度远大于铸铁表面脱钝临界值;LPR与EIS所评估的试件腐蚀程度基本一致。
[Abstract]:Aiming at the corrosion problem of cement mortar and ductile iron pipe under the condition of water conveyance, this paper designs and manufactures the ring specimen of cement mortar ductile iron pipe with inner lining. The linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) of tube ring specimens under disturbance erosion of 6M ammonium nitrate and 6m ammonium chloride solution in purified water were measured. The linear polarization resistance of the samples in different solutions was analyzed. The corrosion current density and other electrochemical parameters vary with the corrosion time, and the corrosion degree of each specimen in different solution is evaluated. The results show that the mortars layer resistance, surface charge transfer resistance and corrosion current density of the samples in purified water are almost unchanged in 120 days, while in ammonium nitrate solution, the resistance of mortar layer decreases obviously. However, the surface charge transfer resistance and corrosion current density of cast iron are almost unchanged, while in ammonium chloride solution, both mortar layer resistance and surface charge transfer resistance of cast iron decrease obviously. The corrosion current density is much larger than the critical value of surface desensitization of cast iron. The corrosion degree of the specimens evaluated by EIS is basically the same.
【作者单位】： 南京理工大学理学院;
【基金】：国家自然科学基金(51378262) 江苏省自然科学基金(BK20141396)
【分类号】：TU991.36;TV672.2
本文编号：2167655
[Abstract]:Aiming at the corrosion problem of cement mortar and ductile iron pipe under the condition of water conveyance, this paper designs and manufactures the ring specimen of cement mortar ductile iron pipe with inner lining. The linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) of tube ring specimens under disturbance erosion of 6M ammonium nitrate and 6m ammonium chloride solution in purified water were measured. The linear polarization resistance of the samples in different solutions was analyzed. The corrosion current density and other electrochemical parameters vary with the corrosion time, and the corrosion degree of each specimen in different solution is evaluated. The results show that the mortars layer resistance, surface charge transfer resistance and corrosion current density of the samples in purified water are almost unchanged in 120 days, while in ammonium nitrate solution, the resistance of mortar layer decreases obviously. However, the surface charge transfer resistance and corrosion current density of cast iron are almost unchanged, while in ammonium chloride solution, both mortar layer resistance and surface charge transfer resistance of cast iron decrease obviously. The corrosion current density is much larger than the critical value of surface desensitization of cast iron. The corrosion degree of the specimens evaluated by EIS is basically the same.
【作者单位】： 南京理工大学理学院;
【基金】：国家自然科学基金(51378262) 江苏省自然科学基金(BK20141396)
【分类号】：TU991.36;TV672.2
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