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51313-02428-In-situ Studies of Precursor Sites for Pit Initiation on CRAs in Chloride Containing Solutions

Product Number: 51313-02428-SG
ISBN: 02428 2013 CP
Author: Luis Garfias
Publication Date: 2013
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The present work has as an objective to show a new technique to study in-situ the determination of precursor sites for pitting corrosion on Corrosion Resistant Alloys using a conventional optical microscope coupled to a potentiostat and additional hardware that allows the real time imaging on the surface of the steels above room temperature inside an electrochemical cell.

The results shows that the precursor sites for pitting on 25 Cr Duplex Stainless Steels were found to be inclusions that are complex in structure and where pits nucleate at temperatures above the Critical Pitting Temperature (CPT) and where stable pitting occurs in artificial sweater at temperatures above the CPT. These inclusions were analyzed and found to be inhomogeneous in nature and consisting of a mixture of various elements (Si Al Mg Ca Ti Mn and S). After analysis of the particles in-situ observation of the particles in the artificial seawater showed that the pits started at those inclusions with further dissolution of the ferrite matrix.

The present work has as an objective to show a new technique to study in-situ the determination of precursor sites for pitting corrosion on Corrosion Resistant Alloys using a conventional optical microscope coupled to a potentiostat and additional hardware that allows the real time imaging on the surface of the steels above room temperature inside an electrochemical cell.

The results shows that the precursor sites for pitting on 25 Cr Duplex Stainless Steels were found to be inclusions that are complex in structure and where pits nucleate at temperatures above the Critical Pitting Temperature (CPT) and where stable pitting occurs in artificial sweater at temperatures above the CPT. These inclusions were analyzed and found to be inhomogeneous in nature and consisting of a mixture of various elements (Si Al Mg Ca Ti Mn and S). After analysis of the particles in-situ observation of the particles in the artificial seawater showed that the pits started at those inclusions with further dissolution of the ferrite matrix.

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