METALS AND METAL MATRIX COMPOSITES |
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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,*
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1 School of Mechanical Engineering,AnHui University of Technology, Maanshan 243032, China 2 Hefei General Machinery Research Institute, Hefei 230031, China |
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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.
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Published: 03 August 2021
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Fund:National High-tech R&D Program (2012AA040103), Anhui Natural Science Research Project (KJ2016SD09, 1908085ME148). |
About author:: Xiaofei Zhang, master of engineering, Anhui University of Technology. He received his bachelor degree from Northeast Agricultural University in 2017. His research interest are corrosion and protection of metal materials. Sixian Rao is a professor and graduate supervisor of Anhui University of Technology. He graduated from the College of Chemistry and Chemical Engineering of Hunan University in 2000, and his Ph.D. from the School of Materials Science and Engineering of Beijing University of Aeronautics and Astronautics in October 2007. In November 2007, he taught at Anhui University of Technology. From 2010 to 2012, he was engaged in postdoctoral research at the Hefei General Machinery Research Institute. Mainly engaged in the research of mechanical equipment failure diagnosis and metal corrosion. In the past five years, he has hosted a sub-project of the 863 project, a sub-project of the 12th Five-Year National Science and Technology Plan, and an outstanding youth project of the provincial colleges and universities. He has published more than 30 papers in domestic and foreign journals, of which more than 20 papers have been retrieved by SCI and EI. He has won the first prize for scientific and technological progress in Anhui province. |
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