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Corrosion of Nickel Alloys in Elevated Temperature Sour Gas Environments

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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
Industries: Oil and Gas Production , Science of Corrosion
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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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10262 Corrosion Resistance of Nickel Alloys and Super Austenitic Stainless Steel Weld Claddings as a Function of Dilution

Product Number: 51300-10262-SG
ISBN: 10262 2010 CP
Author: Dirk Aberle, Martin Wolf and Friedrich Stenner
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Nickel alloys UNS N06625, UNS N06059, UNS N06022, UNS N08825 and one Special Stainless Steel (UNS N08031) are overlay welded in 1 to 3 layers on carbon steel. The dilution is measured and results of pitting corrosion in an immersion test with “Green Death” solution will be discussed.
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51316-7113-Relation Between Localized Corrosion And SCC In Nickel Based Alloys In HP/HT Oil And Gas Environments

Product Number: 51316-7113-SG
ISBN: 7113 2016 CP
Author: Thodla Ramgopal
Publication Date: 2016
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Fatigue and fracture performance of UNS N07718 (718) and UNS N07716 (625+) in sour environments over a range of temperatures (300 to 400°F) and chloride concentrations (0.15wt% to 25wt% NaCl). Rising displacement fracture toughness test performed in a range of environments.

 
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