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Pitting Behavior of Lean Duplex Stainless Steels in Thiosulfate-Containing Paper Machine Environment

This paper examined the pitting corrosion resistance of new grades of lean duplex stainless steels (LDSSs) UNS S32304, UNS S32003 and UNS S82441 in both chloride-only solution and thiosulfate containing simulated white water environments.

Product Number: 51317--9163-SG
ISBN: 9163 2017 CP
Author: Liang He
Publication Date: 2017
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The presence of thiosulfate ions in the paper machine white water environment has been shown to increase the pitting susceptibility of stainless steels. Understanding how different grades of stainless steels behave in thiosulfate containing environments not only helps with material selection but also contributes to the understanding of mechanisms by which thiosulfate ions affect pitting in different alloys. As new grades of lean duplex stainless steels become available as candidate materials for the pulp and paper environments it is important to evaluate their behavior in the thiosulfate and chloride containing environments. This paper focuses on lean duplex stainless steel grades UNS S32304UNS S32003 and LDX 2404. Electrochemical methods were used to study the stable and metastable pitting susceptibility of selected alloys in simulated white water environments.

Key words: Lean Duplex Stainless Steels, thiosulfate pitting, paper machine white water

The presence of thiosulfate ions in the paper machine white water environment has been shown to increase the pitting susceptibility of stainless steels. Understanding how different grades of stainless steels behave in thiosulfate containing environments not only helps with material selection but also contributes to the understanding of mechanisms by which thiosulfate ions affect pitting in different alloys. As new grades of lean duplex stainless steels become available as candidate materials for the pulp and paper environments it is important to evaluate their behavior in the thiosulfate and chloride containing environments. This paper focuses on lean duplex stainless steel grades UNS S32304UNS S32003 and LDX 2404. Electrochemical methods were used to study the stable and metastable pitting susceptibility of selected alloys in simulated white water environments.

Key words: Lean Duplex Stainless Steels, thiosulfate pitting, paper machine white water

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11255 Pitting Corrosion Mechanisms of Lean Duplex, Duplex and Super Duplex Stainless Steels in Chloride Solutions

Product Number: 51300-11255-SG
ISBN: 2011 11255 CP
Author: J. Saithala, J. Atkinson, H Ubhi, A. Patil
Publication Date: 2011
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