Analysis of Ultra-Trace Amount of Residual Hydrogen

Outline of the Analysis of Ultra-Trace Amount of Residual Hydrogen

JEF-TEC can provide the analytical service on the quantification of a trace amount of residual hydrogen trapped in the iron and steel materials when joining and plating. This analysis can help evaluation of new materials and modified products as well as optimization of manufacture process of those products for controlling delayed fracture when used.

JEF-TEC's Strength in Analysis Techniques

  • Measurement under atmosphere from ambient temperature to 800°C ensures the reproducibility of environmental effects on fatigue and rapid fracture in the behavior analysis.
  • High-sensitivity measurement with mass spectrometry maximizes the detection limit in a range of 10 to 50 parts per billons.
  • Wide selection of temperature conditions for the test such as temperature elevation mechanism and a long hold period at constant temperature is available for evaluation of hydrogen release.

Measurement Principle and Analysis Examples

Atmospheric pressure ionization mass spectrometer (Developed by the Analysis & Characterization Research Dept., JFE Steel Research Laboratory)
Atmospheric pressure ionization mass spectrometer
(Developed by the Analysis & Characterization Research Dept., JFE Steel Research Laboratory)
Diagram for principle of measurement
Diagram for principle of measurement
Hydrogen extraction curve
Hydrogen extraction curve

Specifications

Sample heating apparatus (quartz tube-type furnace)

  • Maximum temperature : 800°C
  • Sample shape : Maximum size 10 mm in diameter and 40 mm in length
  • Detection limit of hydrogen : 0.001 to 10 ppm (based on the hydrogen concentration in steel)

Key Points in Sample Preparation

  • Samples are preferably kept at liquid nitrogen temperature for preventing the release of hydrogen during the storage.
  • Films on the surface of samples which may be decomposed in a heating step have to be removed before analysis without losing hydrogen.

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