Corrosion behaviour of hastelloy c22 in alkali salt environment
| dc.contributor.author | Low Su Yeian | |
| dc.date.accessioned | 2021-07-29T03:32:28Z | |
| dc.date.available | 2021-07-29T03:32:28Z | |
| dc.date.issued | 2016-06 | |
| dc.description.abstract | Chloride-induced corrosion at elevated temperature originate from the high content of alkali metal compounds such as potassium chloride (KCl) and potassium sulphates (K2SO4) is a problem that often occurs in biomass industry. Ni-forming alloy, C22 is often suggested as a potential superheater material to combat high temperature corrosion as its high Ni/Cr content provides excellent corrosion resistance. This work has two main objectives. The first is to investigate the influences of air humidity on the corrosion behaviour of superalloy C22. Secondly, to justify the suitability of superalloy C22 as a potential superheater material for higher temperature use. The high temperature corrosion behaviours of superalloy C22 in the synthetic salt containing 80wt% KCl + 20wt% K2SO4 have been investigated under two different atmospheres: normal air and dry air condition. All experiments were performed at temperature 650℃ for 218 hours. The surface morphology, elemental distributions and the corrosion products were monitored using a scanning electron microscope equipped with energy dispersive x-ray (SEM-EDX). Thermogravimetric analysis (TGA) and X-ray diffraction (XRD) utilized in monitoring the kinetics of corrosion and phase identification of corrosion layers. The presence of air moisture has a clear effect on the corrosion layer where the loss of protective properties of the oxide is attributed to the formation of volatile hydroxide species, Cr(VI) oxide hydroxide. Cr(VI) oxide hydroxide converts the protective chromium oxide-rich surface into a poorly protective iron-rich oxide, hence reduce the protective capability of the oxide scale. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/13881 | |
| dc.language.iso | en | en_US |
| dc.title | Corrosion behaviour of hastelloy c22 in alkali salt environment | en_US |
| dc.type | Other | en_US |
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