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51313-02769-Investigation of Initial Stage of Metal Dusting Corr. in the Conversion of Natural to Synthesis Gas

Product Number: 51313-02769-SG
ISBN: 02769 2013 CP
Author: Daham Gunawardana
Publication Date: 2013
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Abstract:

Ni-based industrial alloy samples (Alloy 601) were subjected to different oxidation conditions followed by exposure to a high carbon activity gaseous mixture containing 10% CO in Ar at 550 ºC in order to reveal factors critical to the initial carbon formation. Fresh and treated alloy samples were studied via optical microscopy scanning electron microscopy (SEM) auger depth-profile analysis transmission electron microscopy (TEM) energy dispersive microscopy (EDS) and electron probe micro-analysis. The results show that the extent of carbon formation is dependent on the oxidation parameters since these affect both the composition and the structure of the 20-60 nm thick oxide layer formed. A high oxygen partial pressure during the oxidation step appears to promote the inclusion of Ni or Fe species in the oxide layer which subsequently reduce and catalyze the growth of carbon filaments. Surface pre-treatment (i.e. polishing before oxidation) is also found to affect the carbon formation. Thermo-gravimetric analyses indicate very low weight gain in the CO exposure period. This confirms the role of the surface oxide layer as a barrierto carbon influx.

Key words: metal dusting corrosion; carbon formation; SEM; TEM; Auger depth profile analysis; thermal gravimetric analysis

Abstract:

Ni-based industrial alloy samples (Alloy 601) were subjected to different oxidation conditions followed by exposure to a high carbon activity gaseous mixture containing 10% CO in Ar at 550 ºC in order to reveal factors critical to the initial carbon formation. Fresh and treated alloy samples were studied via optical microscopy scanning electron microscopy (SEM) auger depth-profile analysis transmission electron microscopy (TEM) energy dispersive microscopy (EDS) and electron probe micro-analysis. The results show that the extent of carbon formation is dependent on the oxidation parameters since these affect both the composition and the structure of the 20-60 nm thick oxide layer formed. A high oxygen partial pressure during the oxidation step appears to promote the inclusion of Ni or Fe species in the oxide layer which subsequently reduce and catalyze the growth of carbon filaments. Surface pre-treatment (i.e. polishing before oxidation) is also found to affect the carbon formation. Thermo-gravimetric analyses indicate very low weight gain in the CO exposure period. This confirms the role of the surface oxide layer as a barrierto carbon influx.

Key words: metal dusting corrosion; carbon formation; SEM; TEM; Auger depth profile analysis; thermal gravimetric analysis

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