PICKLING – PASSIVATION MECHANISM AND PROCESS OPTIMIZATION OF Q235 STEEL PIPELINE

Hongchao   Ji; Shuo Cai; Fengyun Zhu; Weichi Pei; Wenchao Xiao; Xuefeng Tang

doi:10.17222/mit.2023.807

Hongchao Ji North China University of Science and Technology, College of Mechanical Engineering, Tangshan, 063210 China
Shuo Cai North China University of Science and Technology, College of Mechanical Engineering, Tangshan, 063210 China
Fengyun Zhu CHINA 22 MCC GROUP CORPORATION LIMITED, Hebei Tangshan, 063035
Weichi Pei North China University of Science and Technology, College of Mechanical Engineering, Tangshan, 063210 China
Wenchao Xiao China University of Geosciences (Beijing), School of Engineering and Technology, Beijing, 100083, China
Xuefeng Tang Huazhong University of Science and Technology, State Key Laboratory of Materials Processing and Die & Mould Technology

DOI: https://doi.org/10.17222/mit.2023.807

Keywords: pipeline cleaning, pickling-passivation, corrosion of pipeline, micromorphology

Abstract

Pipe cleaning is currently the most effective method to improve the cleanliness and corrosion resistance of pipes. In this paper, a new method of pipe cleaning is proposed, combining mechanical and chemical cleaning, offline tank cleaning and online cycle cleaning. Through experiments and characterization of the morphology changes, the mechanism of pickling and passivation of Q235 steel was explored, and the entire process of microstructure and morphology changes on the pipe wall’s surface was analyzed to verify the feasibility of this technology. The cleaning process was optimised using response surface analysis to determine the optimum cleaning conditions. This study is of great relevance to the effective operation of continuous-casting equipment over a long period of time.

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