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Hydrogen measurement systems for monitoring plating and corrosion embrittlement hazards are described, as is the new sensor for measuring molecular hydrogen levels at low partial pressures. Correlation between the first two and embrittlement thresholds of 260 to 280 ksi 4340 sustained load specimens of varying geometry are presented. Correlation measurements with the latter type have been shown feasible with salt spray, seawater acetic acid tests, field exposure, as well as exfoliation corrosion susceptability. Test procedures for both types of sensors and discussion of correlation data are given.
hydrogen embrittlement, reembrittlement, stress corrosion, surface activation, oxides, permeability, hydrogen poisons, palladium, steels, vacuum probes
President, Lawrence Electronics Co., Seattle, Wash.