含砂NaCl水溶液中流速对N80钢冲刷腐蚀行为的影响
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摘要
为了揭示流速对N80钢冲刷腐蚀的作用机理,采用旋转圆柱电极装置结合电化学、失重法、腐蚀形貌观测法,研究了不同流速下N80钢在含砂粒的NaCl水溶液中的冲刷腐蚀行为。结果表明:随着流速的增大,N80钢的冲刷腐蚀速率先小幅增大后大幅增大;不同流速下,N80钢阴极出现氧扩散特征,其阴极反应的Tafel斜率均大于阳极反应的Tafel斜率,整个反应过程受阴极氧化还原反应控制。在实际过程中,可以通过控制流速来降低管道内腐蚀介质对管壁的冲刷腐蚀,以提高管道使用寿命。
In order to reveal the affecting mechanism of flow velocity on erosion-corrosion of N80 steel,the erosioncorrosion behavior of N80 steel in NaCl aqueous solution containing sand was studied at different flow velocities using rotary cylinder electrode device combined with electrochemistry method, weight loss method and corrosion morphology observation.The results show that the erosion-corrosion rate of the N80 steel increased slightly first and then increased obviously with the increase of flow velocity.Oxygen diffusion characteristics appeared on the cathode of N80 steel under different conditions of flow velocity.The Tafel slope of the cathodic reaction was greater than that of the anodic reaction for the N80 steel,so the whole reaction process was controlled by the cathodic oxidationreduction reaction.In the process of oil transportation,the method of controlling the flow velocity of corrosive medium could be applied to reduce erosion-corrosion of tube wall for improving the service life of pipeline.
In order to reveal the affecting mechanism of flow velocity on erosion-corrosion of N80 steel,the erosioncorrosion behavior of N80 steel in NaCl aqueous solution containing sand was studied at different flow velocities using rotary cylinder electrode device combined with electrochemistry method, weight loss method and corrosion morphology observation.The results show that the erosion-corrosion rate of the N80 steel increased slightly first and then increased obviously with the increase of flow velocity.Oxygen diffusion characteristics appeared on the cathode of N80 steel under different conditions of flow velocity.The Tafel slope of the cathodic reaction was greater than that of the anodic reaction for the N80 steel,so the whole reaction process was controlled by the cathodic oxidationreduction reaction.In the process of oil transportation,the method of controlling the flow velocity of corrosive medium could be applied to reduce erosion-corrosion of tube wall for improving the service life of pipeline.
引文
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[2]李涌泉,余斌高,刘建强,等.N80钢抗液固两相冲刷腐蚀行为的研究[J].表面技术,2013,42(6):37-39.
[3] HU X,NEVILLE A.An examination of the electrochemical characteristics of two stainless steels(UNS S32654and UNS S31603)under liquid-solid impingement[J].Wear,2004,256(5):537-544.
[4] LUO S Z,ZHENGY G,LI J,et al.Slurry erosion resistance of fusion bonded epoxy powder coating[J].Wear,2001,249(8):733-739.
[5] ZHENG Y G,YU H,JIANG S L,et al.Effect of the sea mud on erosion-corrosion behaviors of carbon steel and low alloy steel in 2.4%NaCl solution[J].Wear,2008,264(11/12):1051-1058.
[6] HUSSAIN E A M,ROBINSON M J.Erosion-corrosion of 2205duplex stainless steel in flowing seawater containing sand particles[J].Corrosion Science,2007,49(4):1737-1754.
[7]曹楚南.腐蚀电化学原理[M].3版.北京:化学工业出版社,2008:125-129.
[8] TANG H L,DONG Z H,CHEN Z Y,et al.The effects of Cl-ion concentration and relative humidity on atmospheric corrosion behavior of PCB-Cu under adsorbed thin electroiytr layer[J].Corrosion Science,2011,53(4):1230-1236.
[9]张旭昀,朱闯,孙丽丽,等.P110钢在Cl-介质中的冲刷与腐蚀行为研究[J].兵器材料科学与工程,2012,35(1):1-5.
[10]王树立,龙凤仪,汪敏慧,等.电化学测量技术在不锈钢点蚀研究中的应用与进展[J].腐蚀与防护,2016,37(7):586-591.
[11]曹楚南,张鉴清.电化学阻抗导论[M].北京:科学出版社,2004:26-27.
[12]赵国仙,吕祥鸿,韩勇.流速对P110钢腐蚀行为的影响[J].材料工程,2008(1):5-8.
[13]徐哲.液固两相流条件下P110钢的冲刷腐蚀研究[D].大庆:东北石油大学,2011.