Corrosion behaviors of super austenitic stainless steel weldment by GTAW welding for ships desulfurization system

Frontiers in Materials

Materials

Seunghyo Lee¹  Seok Oh²  Myeonghoon Lee²  Beomdeok Seo²  Yongseong Kim² 

[1] Department of Ocean Advanced of Materials Convergence Engineering, Korea Maritime and Ocean University, Busan, Republic of Korea;Division of Marine Engineering, Interdisciplinary Major of Maritime AI Convergence, Korea Maritime and Ocean University, Busan, Republic of Korea;

关键词: ships desulfurization system;    super austenitic stainless steel;    weldment corrosion;    ERNiCrMo-3;    ERNiCrMo-4;   

DOI  :  10.3389/fmats.2023.1038574

 received in 2022-10-20, accepted in 2023-06-14,  发布年份 2023

来源: Frontiers

【 摘 要 】

This study aims to clarify how filler-typed metals which were ERNiCrMo-3 and ERNiCrMo-4 affect corrosion resistance characteristics in the weldment of super austenitic stainless steel joints under the simulated desulfurization environment for ships. The desulfurization environment includes high temperature, chlorides, and acidic conditions, which, inevitably, can cause severe corrosion to great extent. For exact clarification, the variations of microstructure and the composition distribution in the weldment before and after welding was examined by using scanning electron microscope and energy dispersive X-ray spectroscopy. Then, the corrosion resistance characteristics were comparatively evaluated through the cyclic potentiodynamic polarization test together with potential measurement under the desulfurization simulated environments. In addition, the correlation between passive film and corrosion resistance characteristics was investigated after identifying the formed features of the passive film through the X-ray photoelectron spectroscopy analysis. Through these studies, it made certain, ERNiCrMo-4 filler metal with high Mo content is advantageous for the formation of MoO3 oxide on the surface, which belongs to form a stable passive film and maintains the corrosion resistance characteristics under the simulated desulfurization environment.

【 授权许可】

Unknown   
Copyright © 2023 Seo, Kim, Oh, Lee and Lee.