Biotic Sol-Gel Coating for the Inhibition of Corrosion in Seawater
Biotic Sol-Gel Coating for the Inhibition of Corrosion in Seawater
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用于抑制海水腐蚀的生物溶胶-凝胶涂层
DOI：
10.1149/1.3453618
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Gittens J
中科院分区：
文献类型：
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作者：
Gittens J
在海洋环境中，腐蚀因含有硫酸盐还原菌的破坏性生物膜的形成而加剧，硫酸盐还原菌通过形成腐蚀性物质（如H2S）促进腐蚀。引起腐蚀的生物膜通常对杀生物剂的灭活具有抗性，因为生物膜细菌受到外聚合物物质（EPS）基质的保护。有趣的是，形成内孢子的多粘类芽孢杆菌的生物膜实际上可以抑制腐蚀。溶胶-凝胶技术和固定化微生物相结合，形成了一种独特的涂层，可抑制铝合金的腐蚀，成本低，有效且环保。活力研究表明，多粘类囊霉内生孢子能够承受高达50%的溶剂浓度和高达1.5M的酸浓度，并在生物溶胶-凝胶涂层内萌发。电化学阻抗谱和线性极化电阻测试，除了一个扩展的现场试验，已经表明，内生孢子加载的涂层显示耐腐蚀性和生物膜形成相对于没有添加内生孢子的涂层。
In marine environments corrosion is exacerbated by formation of destructive biofilms containing sulphate-reducing bacteria, which promote corrosion by forming corrosive species, such as H2S. Corrosion-causing biofilms are often resistant to inactivation by biocides since the biofilm bacteria are protected by a matrix of exopolymeric substances (EPS). Paradoxically, a biofilm of the endospore-forming Paenibacillus polymyxa can actually inhibit corrosion. Sol gel technology and immobilized microorganisms have been combined in a unique coating that inhibits corrosion on aluminium alloys, being low-cost, effective and environmentally friendly. Viability studies show that P. polymyxa endospores are able to withstand solvent concentration of up to 50% and an acid concentration of up to 1.5 M and germinate within a biotic sol-gel coating. Electrochemical impedance spectroscopy and linear polarization resistance tests, in addition to an extended field trial, have shown that the endospore-loaded coatings show resistance to corrosion and biofilm formation relative to the coatings without added endospores.