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Effects of Annealing Temperature on Pitting Corrosion of LDX 2003 and LDX 2404 Duplex Stainless Steels

Electrochemical methods were used to evaluate pitting susceptibility of differently heat-treated DSS samples. Results from this study provide further knowledge on the heat treatment effects for the relatively new grades of lean duplex stainless steels.

Product Number: 51317--9156-SG
ISBN: 9156 2017 CP
Author: Liang He
Publication Date: 2017
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Annealing at different temperature can alter the phase ratio as well as chemical composition of ferrite and austenite phases in duplex stainless steels (DSSs) and thus can also change the pitting corrosion resistance of DSSs. Pitting behavior was evaluated for the selected lean DSS grades LDX 2003 and LDX 2404 annealed at different temperatures between 1000 ºC to 1200 ºC. Pit morphology was characterized using SEM and EDS to see if there was a preferential dissolution of a particular phase during pit propagation. Differently heat-treated samples of the selected DSS alloys were tested in both chloride solution and thiosulfate containing chloride solutions to understand how the differences in microstructures affect the pit initiation and/or propagation in different environments. Electrochemical methods were used to evaluate the pitting susceptibility of differently heat-treated DSS samples in given test environment. Results from this study provide further knowledge on the heat-treatment effects for the relatively new grades of lean duplex stainless steels.

Key words: Duplex Stainless Steels, Annealing, Pitting Corrosion

Annealing at different temperature can alter the phase ratio as well as chemical composition of ferrite and austenite phases in duplex stainless steels (DSSs) and thus can also change the pitting corrosion resistance of DSSs. Pitting behavior was evaluated for the selected lean DSS grades LDX 2003 and LDX 2404 annealed at different temperatures between 1000 ºC to 1200 ºC. Pit morphology was characterized using SEM and EDS to see if there was a preferential dissolution of a particular phase during pit propagation. Differently heat-treated samples of the selected DSS alloys were tested in both chloride solution and thiosulfate containing chloride solutions to understand how the differences in microstructures affect the pit initiation and/or propagation in different environments. Electrochemical methods were used to evaluate the pitting susceptibility of differently heat-treated DSS samples in given test environment. Results from this study provide further knowledge on the heat-treatment effects for the relatively new grades of lean duplex stainless steels.

Key words: Duplex Stainless Steels, Annealing, Pitting Corrosion

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