Test results for four alloys in six different sour environments are presented. Alloys 625, 825, 316L and carbon steel were testing in sour gas with varying exposure to moisture at 280°C. Corrosion rates for each alloy over a 30 day period are measured from mass and thickness changes. Alloy 825 and 625 showed negligible corrosion rates and scale formation. 316L showed a thin adherent scale, while carbon steel showed gross corrosion and scale formation. EDS data has been collected measuring the concentration of sulfur at the surface of each material after exposure. This data indicate that sulfur diffusion into the bulk of high Nickel alloys did not occur in measurable amounts. The environments and temperatures tested represent an area of exposure for nickel alloys that does not have a large body of industry-available literature or data. These results will assist future decision-making and alloy selection processes for sour gas service.

Subject
Sulfur, Energy dispersive X-ray spectroscopy, Materials, Corrosion rate, Nickel based alloys, Sour environments, Liquids, Corrosion scales, Wet gas, Scale, Sulfidation, Carbon steel, Alloys
Keywords:
Alloy 625, Alloy 825, sulfidation, sour service, Energy Dispersive Spectroscopy
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2017
Association for Materials Protection and Performance (AMPP)
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