TY - JOUR
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
N1 - Publisher Copyright:
© 2021 NACE International.
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
UR - http://www.scopus.com/inward/record.url?scp=85130988125&partnerID=8YFLogxK
U2 - 10.5006/3593
DO - 10.5006/3593
M3 - 文章
AN - SCOPUS:85130988125
SN - 0010-9312
VL - 77
SP - 148
EP - 155
JO - Corrosion
JF - Corrosion
IS - 2
ER -