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<p>This study systematically examines the effects of Mg/Si ratios and natural aging on the microstructural evolution and corrosion behavior of Al–Mg-Si alloys through a combination of electrochemical measurements, intergranular corrosion tests, stress corrosion cracking evaluations, and quantitative microstructural analysis. In high Mg/Si alloys, excessive Mg solute promotes coarse, continuously distributed grain boundary precipitates and wide precipitate-free zones (PFZs, averaging 81.9&#xa0;nm), leading to deteriorated corrosion resistance. Extended natural aging promotes the dissolution of metastable Mg-rich clusters during artificial aging, leading to a reduced density of intragranular precipitates, while simultaneously inducing coarsening and continuous distribution of grain boundary precipitates. These microstructural evolutions collectively exacerbate the degradation of the material's corrosion performance. In contrast, low Mg/Si alloys exhibit improved corrosion resistance after natural aging, as high-density stable Si-rich clusters serve as nucleation sites of intracrystalline precipitates, suppressing grain boundary precipitate coarsening and promoting a discrete distribution. Medium Mg/Si alloys achieve an optimal balance, inhibiting continuous grain boundary precipitation and maintaining narrow PFZs (39.07&#xa0;nm). In industrial production, attempting to achieve superior properties through extremely short natural aging is not feasible. This study indicates that appropriately extending the natural aging time can simultaneously enhance both the mechanical properties and corrosion resistance of the alloy, demonstrating significant application potential.</p>

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Unveiling the Mg/Si ratio-dependent corrosion mechanisms in naturally aged Al–Mg-Si alloys

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Cui Zhenjie,
  • Jiang Haichang,
  • Zhang Duo,
  • Zhang Rumeng,
  • Dong Qijuan

摘要

This study systematically examines the effects of Mg/Si ratios and natural aging on the microstructural evolution and corrosion behavior of Al–Mg-Si alloys through a combination of electrochemical measurements, intergranular corrosion tests, stress corrosion cracking evaluations, and quantitative microstructural analysis. In high Mg/Si alloys, excessive Mg solute promotes coarse, continuously distributed grain boundary precipitates and wide precipitate-free zones (PFZs, averaging 81.9 nm), leading to deteriorated corrosion resistance. Extended natural aging promotes the dissolution of metastable Mg-rich clusters during artificial aging, leading to a reduced density of intragranular precipitates, while simultaneously inducing coarsening and continuous distribution of grain boundary precipitates. These microstructural evolutions collectively exacerbate the degradation of the material's corrosion performance. In contrast, low Mg/Si alloys exhibit improved corrosion resistance after natural aging, as high-density stable Si-rich clusters serve as nucleation sites of intracrystalline precipitates, suppressing grain boundary precipitate coarsening and promoting a discrete distribution. Medium Mg/Si alloys achieve an optimal balance, inhibiting continuous grain boundary precipitation and maintaining narrow PFZs (39.07 nm). In industrial production, attempting to achieve superior properties through extremely short natural aging is not feasible. This study indicates that appropriately extending the natural aging time can simultaneously enhance both the mechanical properties and corrosion resistance of the alloy, demonstrating significant application potential.