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.


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    Title :

    Electrochemical sensors for monitoring hydrogen in steel


    Additional title:

    Elektrochemische Sensoren zur Registrierung von Wasserstoff in Stahl


    Contributors:
    Morris, D.R. (author) / Sastri, V.S. (author) / Elboujdani, M. (author) / Revie, R.W. (author)

    Published in:

    Corrosion, Houston ; 50 , 8 ; 641-647


    Publication date :

    1994


    Size :

    7 Seiten, 6 Bilder, 4 Tabellen, 17 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






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