Alkaline corrosion resistance of slag-free self-shielded titanium-added metal-cored welding overlay

• Main Authors: Liu, Da Shuang, Long, Wei Min, Wu, Yu Cheng, Wei, Ping, Song, Kui Jing, Li, Xian Fen, Wang, Rui, Zhou, Wei
• Other Authors: School of Mechanical and Aerospace Engineering
• Format: Article
• Language: English
• Published: 2024
• Subjects: Engineering::Mechanical engineering; Alkaline Corrosion Resistance; Carbides
• Online Access: https://hdl.handle.net/10356/172933
• Institution: Nanyang Technological University

The corrosion resistance of slag-free self-shielded metal-cord welding overlay with different ferrotitanium additions in alkaline solution (pH=14) was investigated. The results show that the self-corrosion potential Ecorr is the highest and the self-corrosion current density Icorr is the minimum when the addition of ferrotitanium is 6 wt. %. titanium carbide corrodes before other carbides in alkaline solution due to the absence of iron. A ferrotitanium addition of 6 wt. % can provide the best corrosion resistance to the fabricated welding overlays, as an increased ferrotitanium addition will result in a decrease in chromium carbide and an increase in titanium carbide, of which titanium carbide is the most prone to corrosion, followed by chromium carbide, and finally the austenitic matrix.