Celebrate World Corrosion Awareness Day with 20% off eCourses and eBooks with code WCAD2024 at checkout!
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.
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
Lean duplex stainless steel (LDSS) can provide mechanical properties similar to that of duplex stainless steel (DSS) and is less expensive. The focus of this work was to assess the stress corrosion cracking (SCC) and SCC susceptibility of DSS and LDSS in chloride-containing sour water conditions.
We are unable to complete this action. Please try again at a later time.
If this error continues to occur, please contact AMPP Customer Support for assistance.
Use this error code for reference:
Please login to use Standards Credits*
* AMPP Members receive Standards Credits in order to redeem eligible Standards and Reports in the Store
You are not a Member.
AMPP Members enjoy many benefits, including Standards Credits which can be used to redeem eligible Standards and Reports in the Store.
You can visit the Membership Page to learn about the benefits of membership.
You have previously purchased this item.
Go to Downloadable Products in your AMPP Store profile to find this item.
You do not have sufficient Standards Credits to claim this item.
Click on 'ADD TO CART' to purchase this item.
Your Standards Credit(s)
1
Remaining Credits
0
Please review your transaction.
Click on 'REDEEM' to use your Standards Credits to claim this item.
You have successfully redeemed:
Go to Downloadable Products in your AMPP Store Profile to find and download this item.
This paper provides an overview of the main properties of duplex stainless steels in terms of chemical composition, mechanical and physical properties. Then, the results of an extensive atmospheric field test program are reported,
In this study, the effect of Mo, Cu and W contents in stainless steels on both NAC and PTA SCC resistance are investigated. The purpose was to optimize a proprietary version of UNS S34751 (TP347LN) with excellent PTA SCC resistance.