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Effect of the Substitution of Ni by N and Mn in Lean Duplex Stainless Steels on SCC Assisted by H2S

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Measurement of uniform corrosion resistance in the presence of H2S, through polarization curves, and slip steps height and spacing, through Atomic Force Microscopy technique (AFM) have been performed.

 

Product Number: 51317--8943-SG
ISBN: 8943 2017 CP
Author: Fiona Ruel
Publication Date: 2017
Industry: Materials Selection and Design
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Over the last decade new lean duplex stainless steels grades have appeared on the oil and gas markets. The substitution of Ni by N and Mn in these new grades influence their susceptibility to stress corrosion cracking (SCC) assisted by H2S.Specimens of S32304 S32202 and S32101 DSS have been tested by means of slow strain rate tensile test in solutions containing 50 g L-1 NaCl 5 g L-1 NaCH3COO under an atmospheric pressure of 100 % of H2S at pH 3.5 in order to compare their resistance to SCC assisted by H2S. Unlike the grade S32202 that remains ductile and does not show any trace of corrosion in that environment S32101 and S32304 suffer from SCC coupled with selective dissolution of the austenitic phase along the cracking paths and are covered with a black corrosion products layer enriched in nickel sulfide.The importance of passive film stability and mechanical properties on these SCC results is discussed based on both measurement of depassivation pH under H2S through polarization curves and slip steps height and spacing through Atomic Force Microscopy technique (AFM).Results show that unlike N Mn raises the depassivation pH value and decreases slip steps height and spacing at the surface of the austenitic phase. Therefore on the basis of previous SCC resistance results the electrochemical passive film stability constitutes the key parameter to understand SCC susceptibility. An initiation mechanism of SCC starting from slip steps and assisted by H2S is proposed.

Key words: Duplex Stainless Steel, Stress Corrosion Cracking, Hydrogen Sulfide, Stacking Fault Energy

Over the last decade new lean duplex stainless steels grades have appeared on the oil and gas markets. The substitution of Ni by N and Mn in these new grades influence their susceptibility to stress corrosion cracking (SCC) assisted by H2S.Specimens of S32304 S32202 and S32101 DSS have been tested by means of slow strain rate tensile test in solutions containing 50 g L-1 NaCl 5 g L-1 NaCH3COO under an atmospheric pressure of 100 % of H2S at pH 3.5 in order to compare their resistance to SCC assisted by H2S. Unlike the grade S32202 that remains ductile and does not show any trace of corrosion in that environment S32101 and S32304 suffer from SCC coupled with selective dissolution of the austenitic phase along the cracking paths and are covered with a black corrosion products layer enriched in nickel sulfide.The importance of passive film stability and mechanical properties on these SCC results is discussed based on both measurement of depassivation pH under H2S through polarization curves and slip steps height and spacing through Atomic Force Microscopy technique (AFM).Results show that unlike N Mn raises the depassivation pH value and decreases slip steps height and spacing at the surface of the austenitic phase. Therefore on the basis of previous SCC resistance results the electrochemical passive film stability constitutes the key parameter to understand SCC susceptibility. An initiation mechanism of SCC starting from slip steps and assisted by H2S is proposed.

Key words: Duplex Stainless Steel, Stress Corrosion Cracking, Hydrogen Sulfide, Stacking Fault Energy

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