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<p>This research investigated the feasibility of substituting 6061-T6 aluminum alloy with the stronger 7075-T6 Al alloy in reciprocating piston compressors designed for hydrogen gas. It examined how high-pressure hydrogen gas (~30&#xa0;bar) at elevated temperatures (110 ± 2&#xa0;°C) affects the mechanical properties of the 7075-T6 Al alloy. The study also evaluated the impact of moisture, hydrochloric acid, and hydrocarbons (100&#xa0;ppm) as impurities in hydrogen gas. Results indicated that trace acid slightly reduced the yield and ultimate tensile strengths, along with a 6% decrease in alloy hardness. However, when hydrocarbons were present with acid, their negative effect was neutralized, yielding tensile properties comparable to those obtained in pure hydrogen and hydrogen with moisture, akin to the reference condition (argon gas). The high-stress fatigue resistance of the alloy at 326 and 342&#xa0;MPa in pure hydrogen and in the presence of different impurities did not show significant variations, but in the presence of acid at the higher stress of 342&#xa0;MPa, a substantial drop in the tolerable cycle (45% reduction) was observed. The fatigue strength of 7075-T6 alloy was estimated to be 245&#xa0;MPa, independent of atmospheric conditions.</p>

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The Effect of Hydrogen on Mechanical Properties of 7075-T6 Al at Elevated Temperatures for High-Duty Compressor Applications

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Mohammad Havazadeh,
  • Keyvan Raeissi

摘要

This research investigated the feasibility of substituting 6061-T6 aluminum alloy with the stronger 7075-T6 Al alloy in reciprocating piston compressors designed for hydrogen gas. It examined how high-pressure hydrogen gas (~30 bar) at elevated temperatures (110 ± 2 °C) affects the mechanical properties of the 7075-T6 Al alloy. The study also evaluated the impact of moisture, hydrochloric acid, and hydrocarbons (100 ppm) as impurities in hydrogen gas. Results indicated that trace acid slightly reduced the yield and ultimate tensile strengths, along with a 6% decrease in alloy hardness. However, when hydrocarbons were present with acid, their negative effect was neutralized, yielding tensile properties comparable to those obtained in pure hydrogen and hydrogen with moisture, akin to the reference condition (argon gas). The high-stress fatigue resistance of the alloy at 326 and 342 MPa in pure hydrogen and in the presence of different impurities did not show significant variations, but in the presence of acid at the higher stress of 342 MPa, a substantial drop in the tolerable cycle (45% reduction) was observed. The fatigue strength of 7075-T6 alloy was estimated to be 245 MPa, independent of atmospheric conditions.