Abstract
Flue gas desulfurization systems (FGDs) are operated in severely corrosive environments that cause sulfuric acid dew-point corrosion. The corrosion behavior of low-alloy steels was tested using electrochemical techniques (electrochemical impedance spectroscopy, potentiodynamic tests, potentiostatic tests), and the corrosion products were analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy. The electrochemical results showed that alloying W with small amounts of Sb, Cu, and Co improves the corrosion resistance of steels. The results of surface analyses showed that the surface of the steels alloyed with W consisted of W oxides and higher amounts of Sb and Cu oxides. This suggests that the addition of W promotes the formation of a protective WO3 film, in addition to Sb2O5 and CuO films on the surface.
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Ji, WS., Jang, YW. & Kim, JG. Effect of tungsten on the corrosion behavior of sulfuric acid-resistant steels for flue gas desulfurization system. Met. Mater. Int. 17, 463–470 (2011). https://doi.org/10.1007/s12540-011-0626-x
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DOI: https://doi.org/10.1007/s12540-011-0626-x