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首页> 外文期刊>RSC Advances >Anticorrosion/antifouling properties of bacterial spore-loaded sol-gel type coating for mild steel in saline marine condition: a case of thermophilic strain of Bacillus licheniformis
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Anticorrosion/antifouling properties of bacterial spore-loaded sol-gel type coating for mild steel in saline marine condition: a case of thermophilic strain of Bacillus licheniformis

机译：盐水海洋状况温和钢的细菌孢子加载溶胶 - 凝胶型涂层的防腐/防污性能：芽孢杆菌嗜热菌株

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摘要

This work reports the performance of a sol-gel type coating encapsulated with biofilm of inoculums of protective thermophilic strain of Bacillus licheniformis endospores isolated from the Gazan hot springs-Saudi Arabia for the inhibition of marine fouling and corrosion protection of S36-grade mild steel in 3.5 wt% NaCl medium. In order to improve its anticorrosion properties, the hybrid sol-gel coating is further doped with zinc molybdate (MOLY) and zinc aluminum polyphosphate (ZAPP) pigments. Marine fouling study was conducted at the Arabia Gulf water of Half Moon Bay, Al-Khobar, Saudi Arabia for 10 weeks on the coated samples with and without the bacterial endospores. The assessment of fouling results reveals that the bacterial endospores possess antifouling potentials since it performed better compared to its abiotic counterpart within the immersion period of study due to their foul-releasing effect. Improved corrosion and fouling resistant in the presence of the bacterial endospores could be attributed to their multi-layered hydrophobic and antibiotic coating surface after bacterial encapsulation. Spores accumulation in the sol-gel coating altered the surface wetness thereby preventing the diffusion of corrosion molecules and ions through the bulk of the coating to the metal surface; this is evident in the trend of electrochemical coating resistance and capacitance. Confocal laser scanning fluorescence and scanning electron microscopies were employed to probe bacterial viability and surface micro-cracks inherent in the coating, respectively. This is the first report of axenic thermophilic strain of Bacillus licheniformis isolated from the Arabian Gulf with inhibiting potentials against corrosion and fouling of industrial steel.
机译：该工作报告了溶胶 - 凝胶型涂层的性能，其植物嗜热嗜热菌的嗜热嗜热菌菌的嗜热嗜热菌株的嗜热菌株中分离出来，以抑制S36级温和钢的海洋污垢和腐蚀保护3.5wt％NaCl培养基。为了改善其防腐性能，杂交溶胶 - 凝胶涂层进一步掺杂钼钼酸锌（摩尔）和铝磷酸锌（Zapp）颜料。海洋污染研究是在半月湾的阿拉伯海湾水，沙特阿拉伯的阿拉伯海湾水中进行了10周的涂层样品，涂有细菌肠道孢子。污垢结果的评估表明，与其在浸入后的浸泡效果中的浸泡期内，细菌肠孢子具有防污潜力，因为它与其在浸入后的浸入期内的非生物对应。在细菌肠孢子的存在下改善腐蚀和污垢抗性可归因于细菌包封后的多层疏水和抗生素涂层表面。溶胶 - 凝胶涂层中的孢子累积改变了表面湿度，从而防止腐蚀分子和离子的扩散通过大部分涂层到金属表面;这在电化学涂层电阻和电容的趋势中是显而易见的。共聚焦激光扫描荧光和扫描电子显微镜用于分别探测涂层中固有的细菌活力和表面微裂纹。这是从阿拉伯海湾分离的芽孢杆菌嗜热菌株的第一个报告，抑制工业钢腐蚀和污染的潜力。

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  • 来源
    《RSC Advances》 |2015年第114期|共13页
  • 作者

    Ubong Eduok; Rami Suleiman; Jeanette Gittens;

  • 作者单位

    Department of Chemistry King Fahd University of Petroleum &

    Minerals (KFUPM) Dhahran 31261 Saudi Arabia;

    Center of Research Excellence in Corrosion King Fahd University of Petroleum &

    Minerals (KFUPM) Dhahran 31261 Saudi Arabia.;

    Biomedical Research Centre Sheffield Hallam University Howard Street Sheffield S1 1WB UK;

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  • 正文语种 eng
  • 中图分类 化学;
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