Alkaline corrosion resistance of slag-free self-shielded titanium-added metal-cored welding overlayAlkalische Korrosionsbest?ndigkeit von schlackefreien, selbstabschirmenden Metalldraht-Auftragschwei?ungen mit Titanzusatz

摘要

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. @@@ The slag-free self-shielded metal-cored welding overlays with different ferrotitanium additions were fabricated. The microstructure and alkaline corrosion behaviour were studied. Finally, the role of titanium on alkaline corrosion resistance was analyzed.image

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