輸水環(huán)境下水泥砂漿-球墨鑄鐵管腐蝕過(guò)程電化學(xué)測(cè)試
發(fā)布時(shí)間：2018-08-06 11:54
【摘要】：該文針對(duì)輸水條件下水泥砂漿-球墨鑄鐵管的腐蝕問(wèn)題,設(shè)計(jì)制作了內(nèi)襯水泥砂漿球墨鑄鐵管環(huán)試件,進(jìn)行純凈水、6M硝酸銨溶液和6M氯化銨溶液擾動(dòng)侵蝕下的管環(huán)試件線性極化電阻(LPR)和電化學(xué)阻抗譜(EIS)測(cè)試,分析了不同溶液中試件的線性極化電阻、腐蝕電流密度等電化學(xué)參數(shù)隨腐蝕時(shí)間的變化規(guī)律,并評(píng)估了各試件在不同溶液中的腐蝕程度。結(jié)果表明,在120天的腐蝕時(shí)間內(nèi),純凈水中試件的砂漿層電阻、鑄鐵表面電荷轉(zhuǎn)移電阻和腐蝕電流密度基本不變;硝酸銨溶液中,試件的砂漿層電阻下降明顯,但鑄鐵表面電荷轉(zhuǎn)移電阻和腐蝕電流密度基本不變;而在氯化銨溶液中,試件砂漿層電阻和鑄鐵表面電荷轉(zhuǎn)移電阻均降低明顯,且腐蝕電流密度遠(yuǎn)大于鑄鐵表面脫鈍臨界值;LPR與EIS所評(píng)估的試件腐蝕程度基本一致。
[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.
【作者單位】： 南京理工大學(xué)理學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(51378262) 江蘇省自然科學(xué)基金(BK20141396)
【分類號(hào)】：TU991.36;TV672.2
本文編號(hào)：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.
【作者單位】： 南京理工大學(xué)理學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(51378262) 江蘇省自然科學(xué)基金(BK20141396)
【分類號(hào)】：TU991.36;TV672.2
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