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51318-11387-Determination of Precursor Sites for Pitting Corrosion of UNS N07718 in Cl-Environments – Part 2. Experimental Results

Picture for Determination of Precursor Sites for Pitting Corrosion of UNS N07718 in Cl-Environments – Part 2. Experimental Results
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Electrochemical testing and in-situ microscopy using a mini-autoclave has been used to determine the precursor sites for pitting corrosion of UNS N07718 at high temperatures in chloride containing environments.

Product Number: 51318-11387-SG
Author: Luis F. Garfias-Mesias / Helmuth Sarmiento Klapper / Jutta Klöwer / Julia Botinha
Publication Date: 2018
Industry: Science of Corrosion
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$20.00
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A novel methodology based on electrochemical testing and in-situ microscopy using a mini-autoclave has been used to determine the precursor sites for pitting corrosion of UNS N07718 at high temperatures in chloride containing environments. Simultaneous in-situ micro-visualization and electrochemical testing were done on mini-electrodes made of UNS N07718 immersed in brines while the temperature was increased to 150 °C. A real time video of the surface of the mini-electrodes was recorded while the temperature where metastable pitting initiated was obtained. The electrochemical noise arising from metastable pitting was assessed at open circuit potential conditions. In addition, potentiodynamic polarization tests were conducted at constant temperature (150 °C). This methodology allowed the determination of the precursor sites for pitting initiation (Nb rich particles) in the complex microstructure of UNS N07718.

 

Key words: Pitting, Critical Pitting Temperature, UNS N07718, Electrochemical Noise

A novel methodology based on electrochemical testing and in-situ microscopy using a mini-autoclave has been used to determine the precursor sites for pitting corrosion of UNS N07718 at high temperatures in chloride containing environments. Simultaneous in-situ micro-visualization and electrochemical testing were done on mini-electrodes made of UNS N07718 immersed in brines while the temperature was increased to 150 °C. A real time video of the surface of the mini-electrodes was recorded while the temperature where metastable pitting initiated was obtained. The electrochemical noise arising from metastable pitting was assessed at open circuit potential conditions. In addition, potentiodynamic polarization tests were conducted at constant temperature (150 °C). This methodology allowed the determination of the precursor sites for pitting initiation (Nb rich particles) in the complex microstructure of UNS N07718.

 

Key words: Pitting, Critical Pitting Temperature, UNS N07718, Electrochemical Noise

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51318-11382-Determination of Precursor Sites for Pitting Corrosion of UNS N07718 in Cl-Environments – Part 1. Experimental Setup

Product Number: 51318-11382-SG
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Publication Date: 2018
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51318-11396-Myth on Tempering Temperature and PWHT Temperature of Cr-Mo steels

Product Number: 51318-11396-SG
Author: Mikihiro Sakata / Sylvain Pillot
Publication Date: 2018
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Experiments illuminating effects of tempering temperatures above and below the PWHT temperature on mechanical properties of Cr-Mo steels. Temperature may be below the PWHT temperature without adverse effects on mechanical properties.
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51318-11438-Electrochemical Methods for Assessing the Pitting Corrosion Resistance of Metallic Materials

Product Number: 51318-11438-SG
Author: Helmuth Sarmiento Klapper / Sebastian Jesse / Andreas Heyn
Publication Date: 2018
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Assessing pitting corrosion resistance of metallic materials in chloride-containing environments at elevated temperature…based on electrochemical results obtained on two materials in oilfield upstream applications.
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