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Effect of Thiosulfate on Metastable Pitting in Chloride Containing Environment

Picture for Effect of Thiosulfate on Metastable Pitting in Chloride Containing Environment
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Product Number: 51315-5971-SG
ISBN: 5971 2015 CP
Author: Yushu Wang
Publication Date: 2015
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Prior research on growth of corrosion pits have shown that the metastable pits repassivate due to the rupture of the oxide pit cover and mixing of the bulk solution with pit solution. Stable pit growth only occurs if the metastable pits stabilize. Pitting typically is related to the presence of chlorides but has also been seen in other anions like thiosulfates. Thiosulfate pitting tends to have lower pitting potentials as well as repassivation potentials than chloride pitting. In some environments such as paper machine white water thiosulfate and chloride ions may coexist. The relative roles of thiosulfate and chloride on metastable pitting of austenitics stainless steels as well as duplex stainless steels are not clear. In this study we investigate the effect of thiosulfate on metastable pitting in chloride containing solution using potentiostatic polarization. Pit morphology is characterized using optical and scanning electron microscopes.
Prior research on growth of corrosion pits have shown that the metastable pits repassivate due to the rupture of the oxide pit cover and mixing of the bulk solution with pit solution. Stable pit growth only occurs if the metastable pits stabilize. Pitting typically is related to the presence of chlorides but has also been seen in other anions like thiosulfates. Thiosulfate pitting tends to have lower pitting potentials as well as repassivation potentials than chloride pitting. In some environments such as paper machine white water thiosulfate and chloride ions may coexist. The relative roles of thiosulfate and chloride on metastable pitting of austenitics stainless steels as well as duplex stainless steels are not clear. In this study we investigate the effect of thiosulfate on metastable pitting in chloride containing solution using potentiostatic polarization. Pit morphology is characterized using optical and scanning electron microscopes.
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Picture for Effect of Thiosulfate on the Pitting Corrosion of Nickel Base Alloys in Chloride Solutions
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Effect of Thiosulfate on the Pitting Corrosion of Nickel Base Alloys in Chloride Solutions

Product Number: 51317--9036-SG
ISBN: 9036 2017 CP
Author: Mariano Kappes
Publication Date: 2017
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Pitting corrosion susceptibility of UNS N06600, UNS N06690 and UNS N08800 was studied in pure 1 M NaCl with and without Na2S2O3 additions. The alloys were tested in the as-received (AR), solution annealed (SA) and aged (SA + A) conditions.
Picture for Pitting Behavior of Lean Duplex Stainless Steels in Thiosulfate-Containing Paper Machine Environment
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Pitting Behavior of Lean Duplex Stainless Steels in Thiosulfate-Containing Paper Machine Environment

Product Number: 51317--9163-SG
ISBN: 9163 2017 CP
Author: Liang He
Publication Date: 2017
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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.
Picture for Chloride Stress Cracking of an Austenitic Stainless Steel Pipe Fitting in a Hydroprocessing Unit
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51317--9518-Chloride Stress Cracking of an Austenitic Stainless Steel Pipe Fitting in a Hydroprocessing Unit

Product Number: 51317--9518-SG
ISBN: 9518 2017 CP
Author: Hayrik Allahverdian
Publication Date: 2017
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Case study: Cracking occurred in a (UNS S32100) type austenitic stainless steel nozzle fitting at a low point in the reactor effluent piping in a Gasoil Hydrotreater unit following start up. Normal preventive measures had been taken.  The failed sample was removed for metallurgical analysis and determination of mechanism(s).
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