Corrosion Resistance of Duplex Stainless Steel Weld Cladding under Electromagnetic Vibration-Assisted Welding

In this study, the corrosion behavior of duplex stainless steel weld cladded on an A۲۸۳ low-carbon steel substrate was systematically investigated. The weld cladding was fabricated via the Gas Tungsten Arc Welding (GTAW) process using ER۲۲۰۹ filler wire. During welding, controlled electromagnetic vibrations with frequencies ranging from ۰ to ۱۰۰ Hz were applied to the specimens. Microstructural characterization revealed that both the application of electromagnetic vibrations and the increase in vibration frequency promoted grain refinement and enhanced the volume fraction of austenite within the weld cladding microstructure. Electrochemical cyclic polarization tests in a ۳.۵ wt.% NaCl solution were conducted to assess the corrosion performance. The results demonstrated that the specimen welded without vibration exhibited superior corrosion resistance compared with those subjected to vibration. This deterioration in corrosion performance was attributed to the increased austenite fraction induced by vibration, leading to a higher density of austenite/ferrite interfaces, which act as preferential sites for pit initiation, as well as an increased presence of secondary austenite. Furthermore, a positive correlation was observed between vibration intensity and pit density, indicating that stronger electromagnetic excitation exacerbates localized corrosion susceptibility

کلیدواژه ها:

Weld cladding ، Electromagnetic vibration ، Microstructure ، Corrosion ، Cyclic polarization ، روکش جوشی ، لرزش الکترومغناطیس ، ریزساختار ، خوردگی ، پلاریزاسیون سیکلی