Hydrogen Penetration Testing

Hydrogen energy has outstanding advantages such as cleanliness and high efficiency, and is an ideal secondary energy source. Especially in the automotive field, it is widely used. The high-pressure hydrogen storage system is the core component of the hydrogen fuel cell vehicle. During its use, the corresponding gas cylinders, valves, joints, etc. are subject to the stress cycle, temperature cycle, high-pressure hydrogen damage and natural environment caused by repeated hydrogen charging and discharging. Due to the effects of extreme temperature and humidity, there are risks such as leakage and cracking. In addition, because hydrogen has the characteristics of large diffusion coefficient, wide explosion limit and low ignition temperature, once leakage occurs, it is very easy to cause explosion and fire under the induction of various complex external environments. Property safety can cause great losses, and its safety has become a topic of concern in the industry. For this reason, it is particularly important to carry out pressure cycle tests and leak/penetration test using hydrogen as a medium.

The gas-phase osmosis method was used to detect the permeation flow curve of hydrogen permeating from the high-pressure side to the low-pressure side of the flat sample at medium and high temperature. From the shape, strength and other properties of the curve, the hydrogen diffusion coefficient, permeability coefficient, activation energy and the interaction between hydrogen and the material were analyzed. Using ultra-high vacuum technology and high-precision quadrupole mass spectrometer to dynamically measure and record hydrogen signal data to ensure accurate measurement of hydrogen permeation curve.

We use ion pump solid line ultra-high vacuum, which can reach 10-7Pa. On the one hand, it can reduce the background signal and realize the test of low hydrogen permeation materials; on the other hand, it can prevent the surface of the sample from being oxidized at high temperature. Using a high-precision quadrupole mass spectrometer and supporting computer software to dynamically measure and record hydrogen signal data, it can record one data every 0.2s to ensure the stability, sensitivity and accuracy of the test.

If you are interested in this service, feel free to contact Matexcel.

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