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<p>Corrosion behavior of warm-rolled and stress relief annealed Al–Mg–Mn alloy in 3.5&#xa0;wt% NaCl solution was investigated using potentiodynamic polarization techniques, electron probe microanalysis (EPMA), electron backscatter diffraction (EBSD), and scanning Kelvin probe force microscopy (SKPFM). For the warm-rolled and stress relief annealed Al–Mg–Mn alloy, the texture can be expressed as {110} &lt;112 &gt; . EBSD analysis demonstrates that pitting sites are unrelated to the texture formed in the alloy. Pitting is resulted from the preferential galvanic dissolution of <i>α</i>-Al matrix around the Al<sub>6</sub>(Fe, Mn) particles (1– 30&#xa0;μm) at or near the grain boundaries (GBs). In contrast, the finer Mg<sub>2</sub>Si particles (&lt; 6&#xa0;μm) do not act as pitting initiators. SKPFM measurements indicate the Al<sub>6</sub>(Fe, Mn) phase exhibits a higher work function than the α-Al matrix, which drives galvanic corrosion in 3.5&#xa0;wt% NaCl solution. Thus, during galvanic corrosion, Al<sub>6</sub>(Fe, Mn) phase acts as cathode to accelerate the dissolution of the α-Al matrix to initiate pitting as a result.</p>

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Corrosion behavior of warm-rolled and annealed Al–Mg–Mn alloy in 3.5 wt% NaCl solution

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • Yanyin Qin,
  • Junwei Fu,
  • Jiaxin Chen,
  • Qixin Tian,
  • Yunfang Wan,
  • Zhaoxia Lu,
  • Baorong Hou

摘要

Corrosion behavior of warm-rolled and stress relief annealed Al–Mg–Mn alloy in 3.5 wt% NaCl solution was investigated using potentiodynamic polarization techniques, electron probe microanalysis (EPMA), electron backscatter diffraction (EBSD), and scanning Kelvin probe force microscopy (SKPFM). For the warm-rolled and stress relief annealed Al–Mg–Mn alloy, the texture can be expressed as {110} <112 > . EBSD analysis demonstrates that pitting sites are unrelated to the texture formed in the alloy. Pitting is resulted from the preferential galvanic dissolution of α-Al matrix around the Al6(Fe, Mn) particles (1– 30 μm) at or near the grain boundaries (GBs). In contrast, the finer Mg2Si particles (< 6 μm) do not act as pitting initiators. SKPFM measurements indicate the Al6(Fe, Mn) phase exhibits a higher work function than the α-Al matrix, which drives galvanic corrosion in 3.5 wt% NaCl solution. Thus, during galvanic corrosion, Al6(Fe, Mn) phase acts as cathode to accelerate the dissolution of the α-Al matrix to initiate pitting as a result.