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51316-7326-Estimation of Critical Localized Corrosion Potentials of Duplex SS with Galvele's Model

Picture for Estimation of Critical Localized Corrosion Potentials of Duplex SS with Galvele's Model
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Crevice corrosion affects the integrity of stainless steels used in oil and gas components exposed to seawater. In this work, the crevice corrosion resistance of a 22-Cr duplex and a 25-Cr super duplex stainless steels (UNS S31803 and UNS S32750, respectively) were investigated.

Product Number: 51316-7326-SG
ISBN: 7326 2016 CP
Author: Mariano Kappes
Publication Date: 2016
Industries: Maritime , Materials Selection and Design
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Crevice corrosion affects the integrity of stainless steels used in oil and gas components exposed to seawater. Traditionally, crevice corrosion testing involves the use of artificial crevice formers to obtain a critical crevice potential, which is a measure of the crevice corrosion resistance of the alloy. The critical acidification model proposed by Prof. J.R Galvele predicts that the critical crevice potential is the minimum potential required to maintain a sufficiently acidic solution inside either a pit or a crevice. Application of Galvele’s model requires an estimation of both the diffusion length and the i vs. E behavior of the metal in the solution inside the crevice.

In this work, the crevice corrosion resistance of a 22-Cr duplex and a 25-Cr super duplex stainless steels (UNS S31803 and UNS S32750, respectively) were investigated. The i vs. E response of the two stainless steels was determined in acidified solutions of various chloride concentrations, which simulate those at an active crevice. Critical potentials predicted by the critical acidification model were compared with critical crevice potentials measured in simulated seawater.

Keywords: downloadable, UNS S32750, UNS S31803, simulated crevice solutions, crevice corrosion, seawater

 

Crevice corrosion affects the integrity of stainless steels used in oil and gas components exposed to seawater. Traditionally, crevice corrosion testing involves the use of artificial crevice formers to obtain a critical crevice potential, which is a measure of the crevice corrosion resistance of the alloy. The critical acidification model proposed by Prof. J.R Galvele predicts that the critical crevice potential is the minimum potential required to maintain a sufficiently acidic solution inside either a pit or a crevice. Application of Galvele’s model requires an estimation of both the diffusion length and the i vs. E behavior of the metal in the solution inside the crevice.

In this work, the crevice corrosion resistance of a 22-Cr duplex and a 25-Cr super duplex stainless steels (UNS S31803 and UNS S32750, respectively) were investigated. The i vs. E response of the two stainless steels was determined in acidified solutions of various chloride concentrations, which simulate those at an active crevice. Critical potentials predicted by the critical acidification model were compared with critical crevice potentials measured in simulated seawater.

Keywords: downloadable, UNS S32750, UNS S31803, simulated crevice solutions, crevice corrosion, seawater

 

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09194 Evaluation of Crevice Corrosion Resistance of Duplex and Super Duplex Stainless Steels for Seawater Pumps

Product Number: 51300-09194-SG
ISBN: 09194 2009 CP
Author: Hiroshi Yakuwa, Katsuhiro Mitsuhashi, Kenichi Sugiyama and Matsuho Miyasaka
Publication Date: 2009
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The crevice corrosion resistance of duplex and super duplex stainless steels used for seawater pumps was evaluated by comparing the to results tests conducted using actual seawater  with the behavior of the stainless steels in artificial seawater
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51316-7325-Investigation of the Stress Corrosion Cracking Behavior of Duplex and Lean Duplex Stainless Steel Parent and Weldment Materials in Sour Service

Product Number: 51316-7325-SG
ISBN: 7325 2016 CP
Author: Chong Li
Publication Date: 2016
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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.

 
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51316-6981-HISCC Resistance and Improvement Methods For Duplex and Super Duplex Stainless Steels

Product Number: 51316-6981-SG
ISBN: 6981 2016 CP
Author: Glenn Byrne
Publication Date: 2016
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The paper reviews the history of  Hydrogen Induced Stress Cracking  (HISC) failures of duplex and super duplex stainless steels when deployed subsea and subject to CP at potentials around minus 1V.
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