Information obtained from two amperometric sensors and from a potentiometric sensor for monitoring hydrogen (H) in steel in contact with corrosive solutions saturated with hydrogen sulfide (H2S) at ambient temperature was compared. The apparent diffusion coefficient (D(app)) for H in the steel as determined by experiments using the amperometric sensors was shown to be independent of H concentration in steel (c(H)). Experiments with the potentiometric sensor indicated D(app) values increased with increasing c(H). The calculated H concentration at the surface of the steel in contact with the corrosive medium (c(Hi)), as obtained from the two amperometric sensors, showed poor agreement. The equivalent pressure of H in the steel (p(H2eq)), as calculated from the voltage measurement of the potentiometric sensor, was strongly dependent on pH of the corrosive solution.
Electrochemical sensors for monitoring hydrogen in steel
Elektrochemische Sensoren zur Registrierung von Wasserstoff in Stahl
Corrosion, Houston ; 50 , 8 ; 641-647
1994
7 Seiten, 6 Bilder, 4 Tabellen, 17 Quellen
Article (Journal)
English
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