Menu
Search
Filters
Close
Menu

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

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

Picture for Determination of Precursor Sites for Pitting Corrosion of UNS N07718 in Cl-Environments – Part 1. Experimental Setup
Available for download

Simultaneous in-situ micro-visualization and electrochemical testing was done on small electrodes from UNS N07718 immersed in artificial seawater at room temperature. 

Product Number: 51318-11382-SG
Author: Louis F. Garfias / S. R. Taylor / Helmuth Sarmiento Klapper / Jutta Klöwer / Julia Botinha / Luis F. Garfias-Mesias
Publication Date: 2018
Industry: Science of Corrosion
$0.00
$20.00
$20.00

Electrochemical methods in combination with in-situ microscopy were considered for studying precursor sites for pitting on nickel alloy UNS N07718 in chloride-containing environments at high temperatures. Therefore, the optimum size of the working electrode and a suitable pseudo-reference electrode must be selected for the electrochemical setup. Simultaneous in-situ micro-visualization and electrochemical testing was done on small electrodes from UNS N07718 immersed in artificial seawater at room temperature. The tests were performed using millimeter-size electrodes (minielectrodes) and micron-size electrodes (microelectrodes). Passivity with little or no metastable activity was observed during potentiodynamic polarization tests conducted using the microelectrodes. In contrast, several metastable events were observed in the minielectrodes during potentiodynamic polarization tests. The differences encountered when using a platinum (Pt) pseudo-reference electrode versus the Ag/AgCl reference electrode were established. A shift of 100 mV or more in the corrosion potential and in the potential where metastable pitting initiated was obtained for the Ag/AgCl reference electrode compared to the values obtained when using a Pt pseudo-reference electrode. 

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

Electrochemical methods in combination with in-situ microscopy were considered for studying precursor sites for pitting on nickel alloy UNS N07718 in chloride-containing environments at high temperatures. Therefore, the optimum size of the working electrode and a suitable pseudo-reference electrode must be selected for the electrochemical setup. Simultaneous in-situ micro-visualization and electrochemical testing was done on small electrodes from UNS N07718 immersed in artificial seawater at room temperature. The tests were performed using millimeter-size electrodes (minielectrodes) and micron-size electrodes (microelectrodes). Passivity with little or no metastable activity was observed during potentiodynamic polarization tests conducted using the microelectrodes. In contrast, several metastable events were observed in the minielectrodes during potentiodynamic polarization tests. The differences encountered when using a platinum (Pt) pseudo-reference electrode versus the Ag/AgCl reference electrode were established. A shift of 100 mV or more in the corrosion potential and in the potential where metastable pitting initiated was obtained for the Ag/AgCl reference electrode compared to the values obtained when using a Pt pseudo-reference electrode. 

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

Product tags
Also Purchased
Picture for Determination of Precursor Sites for Pitting Corrosion of UNS N07718 in Cl-Environments – Part 2. Experimental Results
Available for download

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

Product Number: 51318-11387-SG
Author: Luis F. Garfias-Mesias / Helmuth Sarmiento Klapper / Jutta Klöwer / Julia Botinha
Publication Date: 2018
$20.00

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.
Picture for Study on the Corrosion Performance of C110 Tubing in Formate Completion Fluid at High Temperature
Available for download

51318-11386-Study on the Corrosion Performance of C110 Tubing in Formate Completion Fluid at High Temperature

Product Number: 51318-11386-SG
Author: Dapeng Li / Lei Zhang / Xiuyun Wang / Zhiwen Yang / Xiaoqi Yue / Minxu Lu
Publication Date: 2018
$20.00

In this paper, the corrosion performance of C110 tubing is investigated in high-density formate completion fluid at 180 oC with different combinations of CO2 mixed and mechanical damage.
Picture for Improving Al-Ga Sacrificial Anodes via Simulation and Verification of Alloy Segregation.
Available for download

51318-11378-Improving Al-Ga Sacrificial Anodes via Simulation and Verification of Alloy Segregation.

Product Number: 51318-11378-SG
Author: Michael Kidd / Alan Druschitz
Publication Date: 2018
$20.00

Simulations showed that by controlling the cooling rate, the segregation of Ga at the grain boundaries can be maintained, avoiding passivation. Al-Ga alloy plates were so produced and subjected to galvanostatic testing, confirmed the simulations.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support