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<p>As a novel study, a newly formulated electroless biocide amphiphilic coating protected brass alloy in artificial seawater contaminated with bacteria. A new galvanic cell is represented for electroless deposition. The adherent polymeric complex of formula [Sn(tetra dentate ligand cephradine)Cl] was deposited. Synergism of tin and cephradine in the coating improved the antibacterial activity, as shown by a lower MIC than native cephradine antibiotic. The insulating, adherent coating surface film protected the brass alloy against microbiologically induced corrosion and showed no biofilm formation, as the compatible coating constituents kill and stop bacterial growth. The delocalized electron (s) permeated lipid layers and penetrated the microbial cell membrane, forming hydrogen bonds with active centers on the constituents of bacterial cells, perturbing respiration and killing bacteria. Polymerization decreased the polarity of the tin coating, increasing its lipophilicity and enhancing penetration. The electrochemical parameters (increased charge transfer resistance (Rct), reduced capacitance of the electrical double layer (Q<sub>dl</sub>) indicated a capacitive insulating coating. The low limiting dissolution current (156&#xa0;mA cm<sup>−2</sup> for 0.00013&#xa0;M organotin, compared to 250&#xa0;mA cm<sup>−2</sup> for the blank sample) confirmed the inhibition of microbial corrosion by the organotin coating. However, the predominant form of corrosion is pitting corrosion.</p>

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Electroless deposition of effective biocide biofouling polymeric organo tin cephradine coating for brass alloy in wastewater

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月10日

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  • Manal A. El Sayed,
  • Howida A. Fetouh

摘要

As a novel study, a newly formulated electroless biocide amphiphilic coating protected brass alloy in artificial seawater contaminated with bacteria. A new galvanic cell is represented for electroless deposition. The adherent polymeric complex of formula [Sn(tetra dentate ligand cephradine)Cl] was deposited. Synergism of tin and cephradine in the coating improved the antibacterial activity, as shown by a lower MIC than native cephradine antibiotic. The insulating, adherent coating surface film protected the brass alloy against microbiologically induced corrosion and showed no biofilm formation, as the compatible coating constituents kill and stop bacterial growth. The delocalized electron (s) permeated lipid layers and penetrated the microbial cell membrane, forming hydrogen bonds with active centers on the constituents of bacterial cells, perturbing respiration and killing bacteria. Polymerization decreased the polarity of the tin coating, increasing its lipophilicity and enhancing penetration. The electrochemical parameters (increased charge transfer resistance (Rct), reduced capacitance of the electrical double layer (Qdl) indicated a capacitive insulating coating. The low limiting dissolution current (156 mA cm−2 for 0.00013 M organotin, compared to 250 mA cm−2 for the blank sample) confirmed the inhibition of microbial corrosion by the organotin coating. However, the predominant form of corrosion is pitting corrosion.