Development of in-situ hydrogen permeation measurement technology based on volumetric analysis of polymer specimen under high pressure hydrogen environment
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An in-situ high-pressure permeation measurement system was developed to evaluate the hydrogen permeation characteristics of polymer sealing materials in high-pressure hydrogen environments. This system enables real-time hydrogen permeation measurements following high-pressure hydrogen injection, utilizing a volumetric analysis method for accurate mole quantification of hydrogen gas. The system is equipped with a self-developed diffusion-permeation analysis program, facilitating precise evaluation of diffusivity, permeability, and solubility for hydrogen. To validate the system, hydrogen permeation tests were conducted on EPDM polymer containing carbon black filler, commonly used in O-ring for gas seals in high-pressure hydrogen infrastructure. The tests, performed at pressures ranging from 1 MPa to 10 MPa, revealed a decrease in hydrogen permeability and diffusivity with increasing pressure, while solubility remained unchanged. This indicates that the hydrogen permeation behavior in the polymer is predominantly influenced by diffusion rather than solubility. The hydrogen uptake data for the EPDM specimen conformed to Henry’s law, with a high squared correlation coefficient of R2 = 0.98. The system's reliability was further confirmed through uncertainty analysis, with all results within a permeability uncertainty of 9.1 %.
Abstract
An in-situ high-pressure permeation measurement system was developed to evaluate the hydrogen permeation characteristics of polymer sealing materials in high-pressure hydrogen environments. This system enables real-time hydrogen permeation measurements following high-pressure hydrogen injection, utilizing a volumetric analysis method for accurate mole quantification of hydrogen gas. The system is equipped with a self-developed diffusion-permeation analysis program, facilitating precise evaluation of diffusivity, permeability, and solubility for hydrogen. To validate the system, hydrogen permeation tests were conducted on EPDM polymer containing carbon black filler, commonly used in O-ring for gas seals in high-pressure hydrogen infrastructure. The tests, performed at pressures ranging from 1 MPa to 10 MPa, revealed a decrease in hydrogen permeability and diffusivity with increasing pressure, while solubility remained unchanged. This indicates that the hydrogen permeation behavior in the polymer is predominantly influenced by diffusion rather than solubility. The hydrogen uptake data for the EPDM specimen conformed to Henry’s law, with a high squared correlation coefficient of R2 = 0.98. The system's reliability was further confirmed through uncertainty analysis, with all results within a permeability uncertainty of 9.1 %.