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09169 Hydrogen Effects on A Grade 2205 Duplex Stainless Steel in Sulfide-Containing Caustic Solutions

Picture for 09169 Hydrogen Effects on A Grade 2205 Duplex Stainless Steel in Sulfide-Containing Caustic Solution
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Product Number: 51300-09169-SG
ISBN: 09169 2009 CP
Author: Preet Singh and Kevin R. Chasse
Publication Date: 2009
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Duplex stainless steel (DSS) may become susceptible to environmental assisted cracking (EAC) in sulfide-containing caustic solutions. The effects of hydrogen on as-received and annealed specimens of grade 2205 DSS exposed to a white liquor, comprised of 150 g/l NaOH and 50 g/l Na2S as well as sulfide-free caustic solution of 150 g/l NaOH have been evaluated by microhardness and nanoidentation after potentiostatic polarization in the solutions at room temperature for different times. A hydrogen microprint technique (HMT) was also used to evaluate the hydrogen accumulation sites on the surface. The microhardness and nanoidentation data suggests that sulfur species promote hydrogen absorption in caustic solutions. The ferrite phase underwent a greater increase in hardness as compared to the austenite phase. Hydrogen absorption in 2205 DSS was possible at the cathodic potential of - 1.2 V versus standard calomel electrode (SCE) in white liquor; however, the effects of hydrogen on the material behavior appear to be minimal based on the hardness data.

Keywords: 2205 duplex stainless steel, hydrogen embrittlement, white liquor, sulfide-containing, hydrogen microprint technique
Duplex stainless steel (DSS) may become susceptible to environmental assisted cracking (EAC) in sulfide-containing caustic solutions. The effects of hydrogen on as-received and annealed specimens of grade 2205 DSS exposed to a white liquor, comprised of 150 g/l NaOH and 50 g/l Na2S as well as sulfide-free caustic solution of 150 g/l NaOH have been evaluated by microhardness and nanoidentation after potentiostatic polarization in the solutions at room temperature for different times. A hydrogen microprint technique (HMT) was also used to evaluate the hydrogen accumulation sites on the surface. The microhardness and nanoidentation data suggests that sulfur species promote hydrogen absorption in caustic solutions. The ferrite phase underwent a greater increase in hardness as compared to the austenite phase. Hydrogen absorption in 2205 DSS was possible at the cathodic potential of - 1.2 V versus standard calomel electrode (SCE) in white liquor; however, the effects of hydrogen on the material behavior appear to be minimal based on the hardness data.

Keywords: 2205 duplex stainless steel, hydrogen embrittlement, white liquor, sulfide-containing, hydrogen microprint technique
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