SYMPOSIA PAPER Published: 01 January 1988

The Barnacle Electrode Method to Determine Diffusible Hydrogen in Steels


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.

Author Information

Berman, David
Aero Materials Division, Naval Air Development Center, Warminster, PA
Agarwala, Vinod
Aero Materials Division, Naval Air Development Center, Warminster, PA
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Developed by Committee: F07
Pages: 98–104
DOI: 10.1520/STP45292S
ISBN-EB: 978-0-8031-6239-6
ISBN-13: 978-0-8031-0959-9