Investigating the Effect of pH on Corroding Magnesium by Dynamic pH Sweep Coupled with Electrochemical Measurements

Michele Curioni; Meng Lyu; Andrea Cioncolini; Fabio Scenini

doi:10.5006/3593

Investigating the Effect of pH on Corroding Magnesium by Dynamic pH Sweep Coupled with Electrochemical Measurements

Michele Curioni^*, Meng Lyu, Andrea Cioncolini, Fabio Scenini

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

A new experimental setup for controlling dynamically the pH of a sodium chloride solution during corrosion testing and electrochemical measurements on magnesium is presented. The setup comprises an electrochemical cell divided in two compartments such asion exchange is possible between the two compartments, but macroscopic exchange of the NaCl solution is avoided. Each of the two compartment contains a graphite electrode, and a pH probe is immersed into one of the two compartment (named test cell) to acquire the value of pH. A controller, connected to a computer, adjusts the potential between the two inert electrodes, such as to develop hydrogen from one electrode and oxygen from the other. As a result, the pH in each compartment increases and decreases respectively. By sequentially measuring the pH and applying an adequate potential to the graphite electrodes, the pH in the test cell can be controlled precisely. In order to perform electrochemical measurement as a function of pH, an additional graphite counter electrode, an Ag/AgCl reference electrode, and a magnesium electrode are also placed in the test cell. As a result, it has been possible to perform pH sweep experiments and to obtain information on the variation of electrochemical behavior of magnesium as a function of the environment pH.

Original language	English
Pages (from-to)	148-155
Number of pages	8
Journal	Corrosion
Volume	77
Issue number	2
DOIs	https://doi.org/10.5006/3593
State	Published - Feb 2021
Externally published	Yes

Keywords

Corrosion monitoring
linear polarization resistance
magnesium
pH changes and effects

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10.5006/3593

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title = "Investigating the Effect of pH on Corroding Magnesium by Dynamic pH Sweep Coupled with Electrochemical Measurements",

abstract = "A new experimental setup for controlling dynamically the pH of a sodium chloride solution during corrosion testing and electrochemical measurements on magnesium is presented. The setup comprises an electrochemical cell divided in two compartments such asion exchange is possible between the two compartments, but macroscopic exchange of the NaCl solution is avoided. Each of the two compartment contains a graphite electrode, and a pH probe is immersed into one of the two compartment (named test cell) to acquire the value of pH. A controller, connected to a computer, adjusts the potential between the two inert electrodes, such as to develop hydrogen from one electrode and oxygen from the other. As a result, the pH in each compartment increases and decreases respectively. By sequentially measuring the pH and applying an adequate potential to the graphite electrodes, the pH in the test cell can be controlled precisely. In order to perform electrochemical measurement as a function of pH, an additional graphite counter electrode, an Ag/AgCl reference electrode, and a magnesium electrode are also placed in the test cell. As a result, it has been possible to perform pH sweep experiments and to obtain information on the variation of electrochemical behavior of magnesium as a function of the environment pH.",

keywords = "Corrosion monitoring, linear polarization resistance, magnesium, pH changes and effects",

author = "Michele Curioni and Meng Lyu and Andrea Cioncolini and Fabio Scenini",

note = "Publisher Copyright: {\textcopyright} 2021 NACE International.",

year = "2021",

month = feb,

doi = "10.5006/3593",

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T1 - Investigating the Effect of pH on Corroding Magnesium by Dynamic pH Sweep Coupled with Electrochemical Measurements

AU - Curioni, Michele

AU - Lyu, Meng

AU - Cioncolini, Andrea

AU - Scenini, Fabio

PY - 2021/2

Y1 - 2021/2

N2 - A new experimental setup for controlling dynamically the pH of a sodium chloride solution during corrosion testing and electrochemical measurements on magnesium is presented. The setup comprises an electrochemical cell divided in two compartments such asion exchange is possible between the two compartments, but macroscopic exchange of the NaCl solution is avoided. Each of the two compartment contains a graphite electrode, and a pH probe is immersed into one of the two compartment (named test cell) to acquire the value of pH. A controller, connected to a computer, adjusts the potential between the two inert electrodes, such as to develop hydrogen from one electrode and oxygen from the other. As a result, the pH in each compartment increases and decreases respectively. By sequentially measuring the pH and applying an adequate potential to the graphite electrodes, the pH in the test cell can be controlled precisely. In order to perform electrochemical measurement as a function of pH, an additional graphite counter electrode, an Ag/AgCl reference electrode, and a magnesium electrode are also placed in the test cell. As a result, it has been possible to perform pH sweep experiments and to obtain information on the variation of electrochemical behavior of magnesium as a function of the environment pH.

AB - A new experimental setup for controlling dynamically the pH of a sodium chloride solution during corrosion testing and electrochemical measurements on magnesium is presented. The setup comprises an electrochemical cell divided in two compartments such asion exchange is possible between the two compartments, but macroscopic exchange of the NaCl solution is avoided. Each of the two compartment contains a graphite electrode, and a pH probe is immersed into one of the two compartment (named test cell) to acquire the value of pH. A controller, connected to a computer, adjusts the potential between the two inert electrodes, such as to develop hydrogen from one electrode and oxygen from the other. As a result, the pH in each compartment increases and decreases respectively. By sequentially measuring the pH and applying an adequate potential to the graphite electrodes, the pH in the test cell can be controlled precisely. In order to perform electrochemical measurement as a function of pH, an additional graphite counter electrode, an Ag/AgCl reference electrode, and a magnesium electrode are also placed in the test cell. As a result, it has been possible to perform pH sweep experiments and to obtain information on the variation of electrochemical behavior of magnesium as a function of the environment pH.

KW - Corrosion monitoring

KW - linear polarization resistance

KW - magnesium

KW - pH changes and effects

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JO - Corrosion

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ER -

Investigating the Effect of pH on Corroding Magnesium by Dynamic pH Sweep Coupled with Electrochemical Measurements

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