介绍了中国特检院自主研发的氢老化试验装置,基于该装置进行车载Ⅳ型储氢气瓶内胆材料高密度聚乙烯（HDPE）在85 ℃、87.5 MPa下1000 h的氢老化试验测试,验证了试验装置的可靠性。此外对氢老化后的试样及对照组试样进行了氢渗透性能测试、力学性能测试。结果表明,经过1000 h老化后HDPE的抗氢渗透性能小幅下降,增加了氢聚集的风险,其中氢渗透系数Pe增加了4.76％,扩散系数D减小3.08％,溶解度系数S增加了8.10%;经过1000 h老化后HDPE材料的强度与塑性均小幅增加,其中平均抗拉强度增加了6.51%、标称断裂伸长率增加了15.33%。
Abstract
This study introduces a hydrogen aging test apparatus independently developed by the China Special Equipment Inspection and Research Institute （CSEI）. Using this apparatus, a 1000-hour hydrogen aging test was conducted on high-density polyethylene （HDPE）, the liner material of Type Ⅳ onboard hydrogen storage cylinders, under conditions of 85 ℃ and 87.5 MPa, verifying the reliability of the test apparatus. Subsequently, hydrogen permeability tests and mechanical property tests were performed on the hydrogen-aged specimens and the control group specimens. The results show that after 1000-hour aging, the hydrogen permeation resistance of HDPE decreased slightly, increasing the risk of hydrogen accumulation, with the hydrogen permeation coefficient（Pe） increasing by 4.76%, the diffusion coefficient（D） decreasing by 3.08%, and the solubility coefficient（S） increasing by 8.10%. After 1000-hour aging, both the strength and ductility of the HDPE material increased slightly, with the average tensile strength increasing by 6.51% and the nominal elongation at break increasing by 15.33%.
关键词
Ⅳ型储氢气瓶 /
氢老化 /
试验装置 /
高密度聚乙烯 /
力学性能
Key words
type Ⅳ hydrogen storage cylinder /
hydrogen aging /
experimental apparatus /
high-density polyethylene /
mechanical properties
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基金
湖南省自然科学基金（2023JJ30249）
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