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<p>The galvanic corrosion behavior of 6082 aluminum alloy coupled to SUS304 was assessed in various NaCl solutions to simulate the various salt water environments. Results showed that the 6082/SUS304 couple was composed of macro-couple (6082/SUS304) and micro-couple (Mg<sub>2</sub>Si or Al(Mn, Fe, Cr, Cu) Si coupled to <i>α</i>-Al), and the galvanic corrosion process intensified with the increased NaCl concentration, especially the Mg<sub>2</sub>Si micro-couple experienced a polarity reversal. The erosive effect of Cl<sup>−</sup> induced the corrosion products to exhibit an evolution tendency of “Al<sub>2</sub>O<sub>3</sub> → Al(OH)<sub>3</sub> → Al(OH)<sub>3−x</sub>Cl<sub>x</sub> → AlCl<sub>3</sub>”. Furthermore, the distributions of potential and current susceptible to the 6082/SUS304 structure were simulated by COMSOL (FEM) and the mechanisms were discussed.</p> Graphical Abstract <p></p>

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Galvanic Corrosion Behavior of 6082 Aluminum Alloy Coupled to SUS304 in Simulated Water Circumstance with Various Salt Concentrations

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Suibo Zhao,
  • Chuntang Yu,
  • Wei Zhang,
  • Wanqi Pu,
  • Lin Chen,
  • Min Feng,
  • Chengyang Jiang

摘要

The galvanic corrosion behavior of 6082 aluminum alloy coupled to SUS304 was assessed in various NaCl solutions to simulate the various salt water environments. Results showed that the 6082/SUS304 couple was composed of macro-couple (6082/SUS304) and micro-couple (Mg2Si or Al(Mn, Fe, Cr, Cu) Si coupled to α-Al), and the galvanic corrosion process intensified with the increased NaCl concentration, especially the Mg2Si micro-couple experienced a polarity reversal. The erosive effect of Cl− induced the corrosion products to exhibit an evolution tendency of “Al2O3 → Al(OH)3 → Al(OH)3−xClx → AlCl3”. Furthermore, the distributions of potential and current susceptible to the 6082/SUS304 structure were simulated by COMSOL (FEM) and the mechanisms were discussed.

Graphical Abstract