ANALYZING AND MODELING LOCALIZED CORROSION BEHAVIOR OF Ni COATING ON PIPELINE STEEL

Ting Dai, Jie Zhao, Yanhong Gu (), Qiang Guo, Xiaoyu Yang and Lei Zhang
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Ting Dai: School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, 19 Qingyuan Beilu, Huangcun, Daxing District, Beijing, P. R. China
Jie Zhao: School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, 19 Qingyuan Beilu, Huangcun, Daxing District, Beijing, P. R. China
Yanhong Gu: School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, 19 Qingyuan Beilu, Huangcun, Daxing District, Beijing, P. R. China
Qiang Guo: School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, 19 Qingyuan Beilu, Huangcun, Daxing District, Beijing, P. R. China†Beijing Key Laboratory of New Energy Vehicle Powertrain Technology, Beijing Jiaotong University, Beijing 100044, P. R. China
Xiaoyu Yang: School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, 19 Qingyuan Beilu, Huangcun, Daxing District, Beijing, P. R. China
Lei Zhang: ��Department of Mechanical Engineering, P.O. Box 755905, University of Alaska Fairbanks, Fairbanks, AK 99775, USA

Surface Review and Letters (SRL), 2022, vol. 29, issue 08, 1-16

Abstract: To improve the corrosion resistance of X70 pipeline steel in seawater, nickel coating was prepared on the surface of X70 steel by electroplating method. The corrosion properties of the samples in simulated seawater were studied by macroscopic electrochemical experiment and micro-scanning electrochemical experiment. The systematic characterization of the samples was conducted using a scanning electron microscope (SEM), energy disperse spectroscopy (EDS), and X-ray diffractometer (XRD) techniques. The time-dependent model was established to simulate the localized corrosion by COMSOL Multiphysics. The characterization results show that the nickel coating prepared at 0.045 A is compact and thickest. In the macroscopic electrochemical results, the impedance value of the nickel layer prepared at 0.045 A is 34% and 36% higher than that of the other two coatings, and the current density is 25% and 66% lower than that of the other two coatings. In the micro-scanning electrochemical results, the impedance value of the nickel layer prepared at 0.045 A is 5% and 40% higher than that of the other two coatings, and the current density is 14% and 26% lower than that of the other two coatings. Therefore, 0.045 A is the best electroplating current for preparing nickel coating. The simulation results show that the micropores on the surface of nickel-plated X70 are easy to induce localized corrosion, and the degree of localized corrosion decreases with the increase of micropore diameter.

Keywords: Steel; corrosion; defects; simulation (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218625X22501104

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