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<p>In this work, the effect of <i>Pseudomonas aeruginosa</i> (<i>P</i>. <i>aeruginosa</i>) on the corrosion behavior of 2219 aluminum alloy manufactured through additive friction stir deposition (AFSD) was investigated. Under sterile conditions, a large number of corrosion products appeared on the sample surface, and the maximum corrosion pit depth reached 5.98&#xa0;μm after 7&#xa0;days of immersion. In the presence of <i>P. aeruginosa</i>, the sample surface was extensively colonized by a substantial biofilm, and the maximum pit depth was only 2.88&#xa0;μm after 7&#xa0;days of immersion. In addition, electrochemical tests demonstrated a two orders of magnitude reduction in corrosion current density compared to the sterile conditions. The scanning electrochemical microscopy (SECM) results also showed a weakening in the cathodic oxygen reduction process on the sample surface under inoculation conditions. The corrosion resistance of 2219 aluminum alloy manufactured through AFSD was enhanced by the colonization of <i>P. aeruginosa</i> biofilm, primarily attributed to the protective effect exerted by extracellular polymeric substances (EPS) within the <i>P. aeruginosa</i> biofilm.</p>

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Enhanced Corrosion Resistance by Pseudomonas aeruginosa on 2219 Aluminum Alloy Manufactured Through Additive Friction Stir Deposition

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Zhongyu Wu,
  • Hongchang Qian,
  • Weiwei Chang,
  • Zhixiong Zhu,
  • Yongyong Lin,
  • Qian Qiao,
  • Dawei Guo,
  • Dawei Zhang,
  • Chi Tat Kwok,
  • Lap Mou Tam

摘要

In this work, the effect of Pseudomonas aeruginosa (P. aeruginosa) on the corrosion behavior of 2219 aluminum alloy manufactured through additive friction stir deposition (AFSD) was investigated. Under sterile conditions, a large number of corrosion products appeared on the sample surface, and the maximum corrosion pit depth reached 5.98 μm after 7 days of immersion. In the presence of P. aeruginosa, the sample surface was extensively colonized by a substantial biofilm, and the maximum pit depth was only 2.88 μm after 7 days of immersion. In addition, electrochemical tests demonstrated a two orders of magnitude reduction in corrosion current density compared to the sterile conditions. The scanning electrochemical microscopy (SECM) results also showed a weakening in the cathodic oxygen reduction process on the sample surface under inoculation conditions. The corrosion resistance of 2219 aluminum alloy manufactured through AFSD was enhanced by the colonization of P. aeruginosa biofilm, primarily attributed to the protective effect exerted by extracellular polymeric substances (EPS) within the P. aeruginosa biofilm.