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In-situ CPT of Austenitic and Duplex Stainless Steels on Chloride Containing Environments

This paper describes a novel methodology to measure the Critical Pitting Temperature (CPT) of a Duplex Stainless Steels (DSS) in artificial seawater based on the Electrochemical Noise (ECN) technique.

Product Number: 51317--9312-SG
ISBN: 9312 2017 CP
Author: Luis GARFIAS-MESIAS
Publication Date: 2017
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This paper demonstrates a novel methodology based on the Electrochemical Noise that can be used to determine the Critical Pitting Temperature (CPT) of Austenitic and DSS in chloride containing environments. The work presented here shows for the first time simultaneous in-situ micro-visualization and CPT of two small electrodes made of austenitic and Duplex Stainless Steel (DSS) while immersed in artificial seawater. A real time video of the surface of the two etched electrodes was recorded while the CPT was obtained. This methodology allowed the observation of metastable pitting below the CPT of the alloy and stable pitting above the CPT.

Key words: CRA, DSS, ECN, Pitting, CPT, Ferrite, Austenite, Inclusions, Precursor Sites, Heat Treatment, Temperature, Annealing Temperature, Electrochemistry, Metastable Pitting, Pit Initiation.

This paper demonstrates a novel methodology based on the Electrochemical Noise that can be used to determine the Critical Pitting Temperature (CPT) of Austenitic and DSS in chloride containing environments. The work presented here shows for the first time simultaneous in-situ micro-visualization and CPT of two small electrodes made of austenitic and Duplex Stainless Steel (DSS) while immersed in artificial seawater. A real time video of the surface of the two etched electrodes was recorded while the CPT was obtained. This methodology allowed the observation of metastable pitting below the CPT of the alloy and stable pitting above the CPT.

Key words: CRA, DSS, ECN, Pitting, CPT, Ferrite, Austenite, Inclusions, Precursor Sites, Heat Treatment, Temperature, Annealing Temperature, Electrochemistry, Metastable Pitting, Pit Initiation.

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