Localized Naphthenic Acid Corrosion of Carbon Steel Under High Flow Rate and Strong Turbulence
ZHANG Xiaofei1, MA Tao1, HUA Xiaochun1, WANG Xiaoyi1, RAO Sixian1,2,*
1 School of Mechanical Engineering,AnHui University of Technology, Maanshan 243032, China 2 Hefei General Machinery Research Institute, Hefei 230031, China
Abstract: Nowadays, it has become a trend to process inferior high-acid crude oil, but there is significant naphthenic acid corrosion in the refining of high-acid crude oil. In order to clarify the effect of high velocity and strong turbulence on naphthenic acid corrosion, naphthenic acid corrosion experiments were carried out under different scour angles, and the velocity and turbulence intensity simulations under different scour angles were also performed. The results show that under different scouring angles (0—90°) there are significant changes in the flow field on the surface of the sample, and the velocity increase and local turbulence are localized. The corrosion rate of naphthenic acid under high velocities and strong turbulence is related to the turbulence field formed in different scouring angles. As the scour angle increases, the maximum corrosion depth tends to increase. When the scouring angle is 90°, the local corrosion depth increases significantly. At 90° scouring angle, the naphthenic acid corrosion can be transformed from the localized corrosion form to local pitting morphology. Pitting corrosion originated from the preferentially corroded pearlite and expanded and merged into macro dish-shaped pitting pits under the action of high flow velocity and strong turbulence.
1 Liang C L, Sun L L, Zhang L J, et al. Corrosion & Protection in Petrochemical Industry, 2013, 30(4), 26(in Chinese). 梁春雷, 孙丽丽, 张立金, 等.石油化工腐蚀与防护, 2013, 30(4), 26. 2 Chen X, Ai Z, Gao J. Pressure Vessel Technology, 2008, 19(5), 30. 3 Craig H. In: NACE—International Corrosion Conference Series. Denver, 2002. 4 Rao S X, Zhou Y, Pan Z W, et al. Journal of Mechanical Engineering, 2013,49(16), 70. 5 Jiang K, Chen X D, Yang T C, et al. Journal of Chinese Society for Corrosion and Protection, 2012, 32(1), 59(in Chinese). 江克, 陈学东, 杨铁成, 等. 中国腐蚀与防护学报, 2012, 32(1), 59. 6 Hass F, Abrantes A C T G, Diógenes A N, et al. Electrochimica Acta, 2014, 124, 206. 7 Kane R D, Cayard M S. Corrosion 2002, Houston, NACE International. Denver, 2002 8 Wu X Q, Jing H M, Zheng Y G, et al. Wear, 2004, 256, 133. 9 Liu G Q, Zhang X L, Qu D R, et al. Corrosion Engineering Science and Technology, 2016, 51(6),445. 10 Liu J Construction model of naphthenic acid corrosion under high temperature and high flow rate. Master's Thesis, Anhui University of Technology, China, 2017(in Chinese). 刘句. 高温高流速下环烷酸腐蚀预测模型构建. 硕士学位论文, 安徽工业大学, 2017. 11 Shi Y H, Xu Y F, Ma D Y, et al. Material Protection, 2014, 47(10), 61. 史艳华,徐燕飞,马大永,等. 材料保护, 2014, 47(10), 61. 12 Chen B F, Yang Q M. Corrosion Science and Protection Technology, 2007, 19(1), 74(in Chinese). 陈碧凤,杨启明.腐蚀科学与防护技术, 2007, 19(1), 74. 13 Javier Alberto Sanabria cala, Nerly Montaez, D Laverde Catao, et al. Journal of Physics: Conference Series, 4th International Meeting for Researchers in Materials and Plasma Technology, DOI:10.1088/1742-6596/935/1/012051. 14 Smart N R, Rance A P, Pritchard A M. In: NACE—International Corrosion Conference Series, Corrosion. Denver, 2002. 15 Peng J, Srdjan N. Corrosion Science. 2017, 115, 93. 16 Trasatti S P, Gabetta G. Corrosion Engineering Science and Technology, 2006, 41, 200. 17 Wu X Q, Jing H M, Zheng Y G. Journal of Materials Science, 2004,39(3), 975. 18 Bota G M, Qu D S, Wolf H A. In: NACE-International Corrosion Conference Series. United States, 2010. 19 Wang X, Shi Y, Shao C, et al. Transactions of Materials and Heat Treatment, 2013, 34(10), 160. 20 Liu J, Li H F, Zhou Y, et al. Acta Petrolei Sinica(Petroleum Processing Section), 2016,32(3),556(in Chinese). 刘句,李会峰,周煜,等.石油学报(石油加工), 2016, 32(3), 556. 21 Rao S X, Zhou Y, Pan Z W, et al. Journal of Mechanical Engineering, 2013, 49(12),142(in Chinese)). 饶思贤, 周煜, 潘紫微, 等. 机械工程学报, 2013, 49(12), 142. 22 Tan L W, Wang Z W, Zhou J Y, et al. Journal of Chongqing University of Technology (Natural Science), 2020,34(9).174(in Chinese). 谭力文,王忠维,邹竟翌,等.重庆理工大学学报(自然科学),2020,34(9),174. 23 Jauseau N, Nesic S. In:NACE-International Corrosion Conference Series, Corrosion.Vancouver, 2016, pp. 2733.
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2021, Vol. 35 
