1 School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China 2 Marine Design & Research Institute of China, Shanghai 200011, China 3 State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, Liaoning, China
Abstract: The 921A carbon steel is widely used to construct the underwater naval equipment due to its high strength. It is always subjected to harsh marine environment and complex flow conditions in its service life. The corrosion performance of 921A steel in the flowing seawater is an important factor which directly influence the safety operation of the underwater naval equipment. In order to clarify the corrosion behavior of 921A steel in flowing seawater, the corrosion performance of 921A steel in the flowing natural seawater of different flow velocities (1—8 m/s) was studied using immerged jet rig system. The influences of the flow field, mass transfer and rust layer on the corrosion behavior of 921A steel in seawater were studied using electrochemical measurement in conjunction with corrosion morphology characterization and CFD simulation. Results showed that the corrosion morphology would change from “flow mark” to pitting damage along with the flow velocity increasing from 1—3 m/s to 5—8 m/s. The increase of the flow velocity of seawater could lead to the formation of rust layer composed by much denser crystals. The corrosion performance of 921A steel is influenced by the coupled effects of flow velocity, mass transfer, wall shear steel, normal stress and rust layer. The accumulation of rust layer and initiation of localized corrosion prefer to occur at the areas of low flow velocity, wall shear stress, but with high normal stress and high mass transfer. The dramatic increases of both normal stress and shear stress at high flow velocity is the main cause for the formation of dense rust layer and pitting damage. The corrosion rate of 921A steel is controlled by the propagation of active dissolved area at the initial immersion stage. However, the mass transfer and the rust layer become the main contributor to the corrosion rate of 921A steel at the end of the test. In future studies, the formation of the different type of rust layer and the propagation of localized corrosion in flowing seawater would be focused.
1 Ma H, Fan Y, Liu Z, et al. Ocean Engineering, 2019, 182, 188. 2 Xu Y, Zhou Q, Liu L, et al. Corrosion Engineering Science and Technology, 2020, 55(7), 579. 3 Robert E. Npj Materials Degradation. DOI:10.1038/S41529-018-0066-x. 4 Mohd A, Suzie S, Muhammad Z. Engineering Failure Analysis, 2020, 115, 104654. 5 López-Ortega A, Bayón R, Arana J. Surface & Coatings Technology, 2018, 349,1083. 6 Xu Y, Tan M. Corrosion Science, 2018, 139, 438. 7 Liu Y W, Zhang Y. Journal of Harbin Engineering University, 2021,42(1),145(in Chinese). 刘英伟,张洋.哈尔滨工程大学学报,2021,42(1),145. 8 Owen J, Godfrey J, Ma W, et al. Corrosion Science, 2020, 165, 108362. 9 Ahmed W, Bello M, Nakla M, et al. Nuclear Engineering and Design, 2012, 252, 52. 10 Choe S, Lee S. Ocean Engineering, 2017, 141,18. 11 Lin Z X, Dang Y, Xu Q, et al. Materials Reports, 2020, 34(Z2), 437(in Chinese). 林震霞,党莹,徐祺,等.材料导报, 2020, 34(Z2), 437. 12 Xu Y, Tan M. Corrosion Science, 2019, 151,163. 13 Liu L, Xu Y, Zhu Y, et al. Journal of the Electrochemical Society, 2020, 167,14. 14 Si X, Si H, Li M, et al. Materials and Corrosion, 2020, 71(10), 1637. 15 Zhang G, Zeng L, Huang H, et al. Corrosion Science, 2013, 77, 334. 16 Zhu Y S, Liu L, Xu Y Z, et al. Materials Reports, 2022, 36(1), 154 (in Chinese). 朱烨森,刘梁,徐云泽,等.材料导报, 2022, 36(1), 154. 17 Zou Y, Wang J, Bai Q, et al. Corrosion Science, 2012, 57,202. 18 Da H, Song S, Behnamian Y, et al. Journal of the Electrochemical Society, 2020, 167, 081507. 19 Xu Y, Zhang Q, Zhou Q, et al. Npj Materials Degradation, 2021, 5(1), 1. 20 Wang L, Wang X T. Journal of Safety and Environment, 2023(8), 2699 (in Chinese). 王琳,王欣婷.安全与环境学报, 2023(8), 2699. 21 Yin X, Meng Z B, Hu H. Materials Reports, 2021, 35(14), 14084 (in Chinese). 殷鑫,孟征兵,胡浩.材料导报, 2021, 35(14), 14084. 22 Zhang X Y, Wang L D, Sun W, et al. Materials Protection, 2021, 54(7), 30 (in Chinese). 张心宇,王立达,孙文,等.材料保护, 2021, 54(7), 30. 23 Wang X J, Xu Q L, Song Y S, et al. Journal of National University of Defense, 2021, 43(5), 160 (in Chinese). 王向军,徐庆林,宋玉苏,等.国防科技大学学报, 2021, 43(5), 160. 24 Li Z Q, Hu J Y, Qiu S W, et al. Development and Application of Mate-rials, 2018,33(6),46 (in Chinese). 李志强,胡靖元,邱胜闻,等.材料开发与应用,2018,33(6),46. 25 Farelas F, Galicia M, Brown B, et al. Corrosion Science, 2010,52,509. 26 Xu Y, Liu L, Xu C, et al. Journal of Solid State Electrochemistry, 2020, 24,1. 27 Morcillo M, Chico B, Alcántara J, et al. Journal of the Electrochemical Society, 2016, 163(8), C426. 28 Zhang Y, Reuterfors E, McLaury B, et al. Wear, 2007,263, 330.
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2023, Vol. 37 
