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Research of Long-life Ag/AgX Reference Electrode Material

Author: XueGuiLin
Tutor: ChenXingJuan
School: Harbin Engineering University
Course: Applied Chemistry
Keywords: Hot dip coating AgX Reference electrode Reduction Performance
CLC: TG174
Type: Master's thesis
Year: 2008
Downloads: 152
Quote: 0
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Abstract


A variety of ships, offshore operations platform in the ocean, there are many metal materials, their degree of corrosion detection is an important part of safety testing . In the the marine metal structure cathodic protection system , the need for a variety of electrochemical parameters measured with high accuracy , stability of the reference electrode is an important component of the electrochemical measurements . Currently, the silver / silver chloride electrode for the seawater used in the reference electrode , but due to the complexity of seawater , wherein the BR - < / sup > the SO 4 < / sub > 2 - plasma affect the long-term stability of the silver / silver chloride reference electrode , and short service life . In this thesis, the use of hot - dip coating prepared by a silver / silver halide reference electrode . Experiments show that 77/ 23 when the electrode potential of better stability and has a smaller internal resistance (R) and polarization resistance ( R p < / sub> ) in the molar ratio of AgCl and AgBr -resistant polarization performance . The dipping temperature is 500 ° C or when the guaranteed amount of AgX dipping enough and preferably electrode performance . Electrode preparation process to restore the parameters of the electrode performance : the electrode potential ( E ) with the hydrogen reduction time ( t , 1 ) extension moves in the negative direction , the reduction time is shorter potential poor stability ; electrode internal resistance and polarization resistance decreases, with the hydrogen reduction of the extension of time , gradually increasing the specific surface area . The electrochemical reduction of the current density (I) had no significant effect on the electrode potential , with reduced current density increases , the electrode internal resistance and polarization resistance decreases, the specific surface area gradually increases . Extend the electrode potential with the electrochemical reduction time ( t 2 < / sub > ) to move in the negative direction , the reduction time is shorter potential stability , as the electrochemical reduction of the extension of time , the electrode internal resistance and polarization resistance decreases and then increases , the specific surface area first increases and then decreases . Reduction method had no significant effect on the stability of the electrode potential , prepared by electrochemical reduction of the electrode having a smaller internal resistance and polarization resistance , the better the performance of the polarization resistance . Test the electrochemical performance of Ag / AgX reference electrode : Ag / AgX electrode temperature coefficient 0.31mV / ° C ; electrode reversible better ; electrode potential concentration increased with the solution Br - < / sup > move in the negative direction .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection
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