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<p>To synchronously improve the mechanical properties and corrosion resistance of spray formed Al-12.3Zn-2.2Mg-1.5Cu alloy, a heat-treatment process combining T9I4 treatment and deep cryogenic treatment (DCT) is proposed. The results show that, compared with T6I4 treatment, the hardness of the alloy after T9I4 treatment and 3-h DCT increased from 210.4 HV to 224.0 HV, the friction coefficient decreased to 0.516, and the mechanical properties were significantly optimized. Electrochemical testing shows that the corrosion current density (i<sub>corr</sub>) of the alloy after T9I4 treatment and 3-h DCT is as low as 0.0075 mA&#xa0;cm<sup>−2</sup>, and the corrosion rate (v<sub>corr</sub>) is 0.2446 mm&#xa0;a<sup>−1</sup>, indicating the best corrosion resistance. Microstructure analysis shows that the precipitated phase is refined and uniformly dispersed after 3&#xa0;h of cryogenic treatment, with the strongest anchoring force for dislocations. At the same time, the precipitation phase at the grain boundary presents a discontinuous distribution, blocking the corrosion channel and making corrosion difficult to occur.</p>

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Effect of Deep Cryogenic Treatment on Microstructure and Properties of Spray-Formed Al-12.3Zn-2.2Mg-1.5Cu Alloy with T9I4 Treatment

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Yuchen Zeng,
  • Fengyi Wang,
  • Ruiming Su

摘要

To synchronously improve the mechanical properties and corrosion resistance of spray formed Al-12.3Zn-2.2Mg-1.5Cu alloy, a heat-treatment process combining T9I4 treatment and deep cryogenic treatment (DCT) is proposed. The results show that, compared with T6I4 treatment, the hardness of the alloy after T9I4 treatment and 3-h DCT increased from 210.4 HV to 224.0 HV, the friction coefficient decreased to 0.516, and the mechanical properties were significantly optimized. Electrochemical testing shows that the corrosion current density (icorr) of the alloy after T9I4 treatment and 3-h DCT is as low as 0.0075 mA cm−2, and the corrosion rate (vcorr) is 0.2446 mm a−1, indicating the best corrosion resistance. Microstructure analysis shows that the precipitated phase is refined and uniformly dispersed after 3 h of cryogenic treatment, with the strongest anchoring force for dislocations. At the same time, the precipitation phase at the grain boundary presents a discontinuous distribution, blocking the corrosion channel and making corrosion difficult to occur.