沉积水中氯、钙离子共存对储罐罐底用钢Q345B耐蚀性的影响
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摘要
通过电化学阻抗谱(EIS)和Mott-schottky曲线研究了Q345B低碳钢在原油沉积水模拟溶液(氯、钙离子共存)中的腐蚀行为(24d)。通过扫描电镜(SEM)观察腐蚀产物的形貌,通过能谱仪(EDS)确定腐蚀产物的成分。结果表明:表征Q345B低碳钢耐蚀性的电荷转移电阻值随浸泡时间的延长并非单调的增加或减小,而是呈非单调性规律,这与腐蚀产物膜的动态形成、溶解或者破裂及再形成有关。腐蚀产物膜具有P型半导体结构,随时间的延长,半导体的类型未改变,但膜内掺杂浓度发生变化。Q345B钢浸泡2 d的腐蚀产物呈颗粒状分布,腐蚀产物膜层较薄;浸泡24 d的腐蚀产物连接成片,膜层较厚,对基体的保护性较好。
The corrosion behavior(24 d) of Q345B low carbon steel in the simulated solution of crude oil sedimentary water(containing chlorine and calcium ions) were investigated by electrochemical impedance spectroscopy(EIS) and Mottschottky curve. The morphology of the corrosion products was observed by scanning electron microscopy(SEM). The composition of the corrosion products was determined by energy dispersive spectroscopy(EDS). The results show that the charge transfer resistance of Q345 B low carbon steel which represents the corrosion resistance of Q345B does not monotonically increase or decrease with the increase of immersion time, but shows a non-monotonic rule. This is related to the dynamic formation, dissolution, rupture and re-formation of the corrosion product film. The Mott-schottky curve shows that the corrosion product film has P-type semiconducting structure, and the type of semiconductor does not change with the increase of time, but the doping concentration in the film changes. The corrosion products formed after immersed for 2 d are in granular distribution and the film of the corrosion products is thin. The corrosion products which immerse for 24 d connect into a piece of film, and the film is thick, which has a good protection for the matrix.
The corrosion behavior(24 d) of Q345B low carbon steel in the simulated solution of crude oil sedimentary water(containing chlorine and calcium ions) were investigated by electrochemical impedance spectroscopy(EIS) and Mottschottky curve. The morphology of the corrosion products was observed by scanning electron microscopy(SEM). The composition of the corrosion products was determined by energy dispersive spectroscopy(EDS). The results show that the charge transfer resistance of Q345 B low carbon steel which represents the corrosion resistance of Q345B does not monotonically increase or decrease with the increase of immersion time, but shows a non-monotonic rule. This is related to the dynamic formation, dissolution, rupture and re-formation of the corrosion product film. The Mott-schottky curve shows that the corrosion product film has P-type semiconducting structure, and the type of semiconductor does not change with the increase of time, but the doping concentration in the film changes. The corrosion products formed after immersed for 2 d are in granular distribution and the film of the corrosion products is thin. The corrosion products which immerse for 24 d connect into a piece of film, and the film is thick, which has a good protection for the matrix.
引文
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[3]王莹,俞宏英,程远,等.钙离子的浓度对X80钢腐蚀行为的影响[J].北京科技大学学报,2013,35(1):66-71.
[4]马丽,郑玉贵.钙离子对NC-55E钢CO2腐蚀产物膜性能的影响[J].腐蚀科学与防护技术,2008,20(2):79-85.
[5]Montemor M F,Simoes A M,Salta M M.Effect of fly ash on concrete reinforcement corrosion studied by EIS[J].Cement&Concrete Composites,2000,22:175-185.
[6]高丽飞,杜敏.304不锈钢在淡化海水中的点蚀行为[J].腐蚀科学与防护技术,2017,29(1):8-14.
[7]伍远辉,罗宿星,付盈盈,等.氯离子环境下混凝土钢筋的电化学阻抗谱特征[J].表面技术,2011,40(3):65-68.
[8]吴俊升,林超,彭冬冬,等.Q345D低合金钢在海洋潮差区的腐蚀规律及电化学行为研究[J].机械工程学报,2016,52(20):30-37.
[9]曹楚南,张鉴清.电化学阻抗谱导论[M].北京:科学出版社,2002.
[10]Abdel A M,Abd B A,Sidahmed I M,et al.Inhibitive action of some plant extracts on the corrosion of steel in acidic media[J].Corrosion Science,2006,48:2765-2779.
[11]Bojinov M,Fabricius G,Laitinen T,et al.Coupling between ionic defect structure and electronic conduction in passive films on iron,chromium and iron-chromium alloys[J].Electrochim.Acta,2000,45:2029-2048.
[12]Carmezim M J,Simoes A M,Figueiredo M O,et al.Electrochemical behaviour of thermally treated Cr-oxide films deposited on stainless steel[J].Corrosion Science,2002,44:451-465.
[13]Feng Z C,Cheng X Q,DongC F,et al.Passivity of 316Lstainless steel in borate buffer solution studied by Mott-Schottky analysis,atomic absorption spectrometry and X-ray photoelectron spectroscopy[J].Corrosion Science,2010,52:3646-3653.
[14]Hakiki N E,Montemor M F,Ferreira M G S,et al.Semiconducting properties of thermally grown oxide films on AISI 304 stainless steel[J].Corrosion Science,2000,42:687-702.
[15]Carmezim M J,Simoes A M,Montemor M F,et al.Capacitance behaviour of passive films on ferritic and austenitic stainless steel[J].Corrosion Science,2005,47:581-591.
[16]Lyu J,Luo H Y.Electrochemical investigation of passive film in pre-deformation AISI 304 stainless steels[J].Applied Surface Science,2012,263(24):29-37.
[17]Lyu J,Luo H Y.Comparison of corrosion properties of passive films formed on phase reversion induced nano/ultrafine-grained 321 stainless steel[J].Applied Surface Science,2013,280(8):124-131.
[18]Morrison S R.Electrochemistry at semiconductors and oxidized metal electrodes[M].New York:Plenum Press,1980.
[19]Gerónimo L C,Vazquez A J,Picquart M,et al.The energetic conditions determining the active dissolution of carbon steel during electrocoagulation in sulfate media[J].Electrochim.Acta,2014,136:146-156.
[20]Chen Y Y,Tzeng H J,Li Wei,et al.Corrosion resistance and mechanical properties of low-alloy steels under atmospheric conditions[J].Corrosion Science,2005,47:1001-1021.
[21]Ghods P,Isgor O B,Bensebaa F,et al.Angle-resolved XPSstudy of carbon steel passivity and chloride-induced depassivation in simulated concrete pore solution[J].Corrosion Science,2012,58:159-167.