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<p>A systematic investigation was conducted to evaluate the corrosion behavior of 6082-T6 aluminum alloy MIG-welded joints subjected to baking paint treatment. Here, the corrosion responses of the weld seam (WS), heat-affected zone (HAZ), and base metal (BM) of the welded joint were examined through electrochemical testing, long-term salt-spray exposure, and detailed microstructural analyses. The results indicate that baking paint treatment promotes the re-precipitation of Mg–Si strengthening phases, leading to a slight decrease in corrosion resistance, manifested by a modest shift in corrosion potential and a limited increase in weight-loss rate. Notably, the maximum variation in corrosion rate does not exceed 0.0125&#xa0;g&#xa0;m<sup>−2</sup>&#xa0;h<sup>−1</sup>. Furthermore, the corrosion mechanisms of WS, HAZ, and BM were thoroughly explained, emphasizing the unique functions of surface defects and secondary phases. Our research offers a detailed understanding of the trade-off between strength restoration and corrosion resistance in welded automotive aluminum alloys. This trade-off is critical in industrial production, and our research highlights the practical applicability of baking paint treatment in these settings.</p>

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Corrosion Resistance of 6082-T6 Aluminum Alloy After MIG Welding and Baking Paint Process

  • 期刊论文

  • 发表日期：

    2026年4月14日

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  • Zhengjie Duan,
  • Jiasheng Ji,
  • Yonghua Duan,
  • Lishi Ma,
  • Ancang Yang,
  • Shanju Zheng,
  • Mengnie Li

摘要

A systematic investigation was conducted to evaluate the corrosion behavior of 6082-T6 aluminum alloy MIG-welded joints subjected to baking paint treatment. Here, the corrosion responses of the weld seam (WS), heat-affected zone (HAZ), and base metal (BM) of the welded joint were examined through electrochemical testing, long-term salt-spray exposure, and detailed microstructural analyses. The results indicate that baking paint treatment promotes the re-precipitation of Mg–Si strengthening phases, leading to a slight decrease in corrosion resistance, manifested by a modest shift in corrosion potential and a limited increase in weight-loss rate. Notably, the maximum variation in corrosion rate does not exceed 0.0125 g m−2 h−1. Furthermore, the corrosion mechanisms of WS, HAZ, and BM were thoroughly explained, emphasizing the unique functions of surface defects and secondary phases. Our research offers a detailed understanding of the trade-off between strength restoration and corrosion resistance in welded automotive aluminum alloys. This trade-off is critical in industrial production, and our research highlights the practical applicability of baking paint treatment in these settings.