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Corrosion of Nickel Alloys in Elevated Temperature Sour Gas Environments

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.

Product Number: 51317--9135-SG
ISBN: 9135 2017 CP
Author: Robert Rettew
Publication Date: 2017
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Alloys 625 825 316L and carbon steel were tested in sour gas with varying exposure to moisture and at two different temperatures (280°C and 350°C). Corrosion rates for each alloy over a 30 day period are calculated based on measured weight loss of the coupons. Energy Dispersive Spectroscopy (EDS) was performed on exposed samples to determine sulfur concentration profiles below the interface of the metal and the corrosion product. The environments and temperatures tested represent service conditions for which little data exists on nickel alloy corrosion. These results will allow for more informed higher-quality decision-making in materials selection and engineering design for sour gas service. The results show comparable performance for Alloys 625 and 825 with inferior performance from the 316L and carbon steel reference materials. Alloy 825 performed slightly better than Alloy 625 under certain conditions but the difference was minimal. In conclusion it can be seen that Alloy 625 and 825 may provide adequate corrosion resistance in these environments but corrosion allowance may be needed in some cases to ensure integrity.

Alloys 625 825 316L and carbon steel were tested in sour gas with varying exposure to moisture and at two different temperatures (280°C and 350°C). Corrosion rates for each alloy over a 30 day period are calculated based on measured weight loss of the coupons. Energy Dispersive Spectroscopy (EDS) was performed on exposed samples to determine sulfur concentration profiles below the interface of the metal and the corrosion product. The environments and temperatures tested represent service conditions for which little data exists on nickel alloy corrosion. These results will allow for more informed higher-quality decision-making in materials selection and engineering design for sour gas service. The results show comparable performance for Alloys 625 and 825 with inferior performance from the 316L and carbon steel reference materials. Alloy 825 performed slightly better than Alloy 625 under certain conditions but the difference was minimal. In conclusion it can be seen that Alloy 625 and 825 may provide adequate corrosion resistance in these environments but corrosion allowance may be needed in some cases to ensure integrity.

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06158 INVESTIGATION OF INTERGRANULAR CORROSION OF Alloy 825 IN SOUR SERVICE

Product Number: 51300-06158-SG
ISBN: 06158 2006 CP
Author: Daryoush Masouri, Mehrdad Arastoo, Mahmoud Zafari
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