STP962: The Barnacle Electrode Method to Determine Diffusible Hydrogen in Steels

    Berman, David A.
    Research chemist and materials technical specialist, Aero Materials Division, Naval Air Development Center, Warminster, PA

    Agarwala, Vinod S.
    Research chemist and materials technical specialist, Aero Materials Division, Naval Air Development Center, Warminster, PA

    Pages: 7    Published: Jan 1988


    Abstract

    An electrochemical method to determine diffusible hydrogen in steels is described. It is a simple but very sensitive device which is capable of measuring hydrogen concentrations of less than 1 weight ppm. The method makes use of nickel/nickel oxide as a polarizing electrode, which is coupled to a hydrogen-containing steel part. The hydrogen is oxidized at the specimen surface, and the current measured is related to the hydrogen concentration. The method demonstrates a high precision in the measurements. It is shown that the measured hydrogen concentration resulting from cadmium plating is a function of specimen bulk. Results from experiments with plated/baked/stressed 300M steel are reviewed.

    Keywords:

    hydrogen embrittlement, diffusible hydrogen, hydrogen determination, hydrogen permeation, barnacle electrode, cadmium plating, high-strength steels


    Paper ID: STP45292S

    Committee/Subcommittee: F07.04

    DOI: 10.1520/STP45292S


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