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98391 CORRELATIONS BETWEEN CORROSION, ELECTROCHEMICAL HYDROGEN FLUX AND A VACUUM FOIL TECHNIQUE

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Product Number: 51300-98391-SG
ISBN: 98391 1998 CP
Author: W.J.D. Shaw, D.M. Jayasinghe and D. Matei
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Vacuum induced hydrogen flux monitoring is used quite extensively in plant and field operations, lt has been found to be a practical and useful extrusive method of monitoring changing corrosion conditions of a system. This work is one of the first in correlating vacuum induced hydrogen flux measurements with the electrochemically determined corrosion rates and with electrochemical hydrogen flux measurements. A special cell was constructed containing three specimen ports, such that simultaneous measurements of the different parameters could be made, Monitoring took place using various gases bubbled sequentially through an aqueous buffered salt solution with a pH of approximately 6.0. The gases were hydrogen sulfide, nitrogen and air. The effect of response of the two hydrogen permeation measurement techniques are compared for a system upset condition. A comparison is also made with corrosion parameters obtained using potentiodynamic techniques and for measured steady state values using these two hydrogen permeation measurement methods. A general understanding of the vacuum foil technique is starting to emerge from this preliminary work. Keywords: hydrogen permeation, hydrogen measurement, vacuum decay, corrosion, upset response, vacuum foil.
Vacuum induced hydrogen flux monitoring is used quite extensively in plant and field operations, lt has been found to be a practical and useful extrusive method of monitoring changing corrosion conditions of a system. This work is one of the first in correlating vacuum induced hydrogen flux measurements with the electrochemically determined corrosion rates and with electrochemical hydrogen flux measurements. A special cell was constructed containing three specimen ports, such that simultaneous measurements of the different parameters could be made, Monitoring took place using various gases bubbled sequentially through an aqueous buffered salt solution with a pH of approximately 6.0. The gases were hydrogen sulfide, nitrogen and air. The effect of response of the two hydrogen permeation measurement techniques are compared for a system upset condition. A comparison is also made with corrosion parameters obtained using potentiodynamic techniques and for measured steady state values using these two hydrogen permeation measurement methods. A general understanding of the vacuum foil technique is starting to emerge from this preliminary work. Keywords: hydrogen permeation, hydrogen measurement, vacuum decay, corrosion, upset response, vacuum foil.
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