Abstract

MULAUDZI, F.M.L.; CORNISH, L.A.; SLABBERT, G.A.  and  PAPO, M.J.. Metal dusting on Alloys 602CA and 800. J. S. Afr. Inst. Min. Metall. [online]. 2012, vol.112, n.spe, pp.589-600. ISSN 2411-9717.

Metal dusting is a corrosion phenomenon that occurs in strongly carburizing gas atmospheres at elevated temperatures. Reaction kinetics and product characterizations of Alloys 602CA and 800 were examined by scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDX) and X-ray diffraction (XRD). The results showed that Alloy 602CA is more resistant to metal dusting than Alloy 800. Visual examination and SEM surface analysis showed that Alloy 800 suffered metal dusting attack after a relatively short exposure period. The amount of coke deposits increased on Alloy 800 with increased exposure from 96 to 336 hours. X-ray diffraction on the reacted surfaces identified graphite and austenite in both alloys and some iron oxides/spinel for Alloy 800.

Keywords : Metal dusting; Alloy 602CA; Alloy 800; SEM-EDX; XRD..

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