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首页> 外文期刊>International Journal of Electrochemical Science >Effect of Bacillus flexus on the Degradation of Epoxy Resin Varnish Coating in Seawater
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Effect of Bacillus flexus on the Degradation of Epoxy Resin Varnish Coating in Seawater

机译：弯曲杆菌对海水中环氧树脂清漆涂层降解的影响

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Protective coatings have been being widely applied on the surface of metallic materials to protect againstcorrosion. However, there is still little known about the degradation of coatings caused bymicrobiological attack in seawater. As one of the most widespread species, Bacillus species are of greatimportance in the deterioration and degradation of materials. In this paper, the effect of Bacillus flexuson the degradation of an epoxy resin varnish coating in seawater was investigated. All the experimentswere conducted in either sterile seawater or seawater containing Bacillus flexus. The electrochemicalcharacteristics of the coatings in both kinds of seawater were monitored with electrochemical impedancespectroscopy (EIS). The reduction of the corrosion resistance of the coating exposed to seawatercontaining Bacillus flexus between 1 day of immersion and 19 days of immersion was evidently largerwhen compared with that in sterile seawater, which indicated that Bacillus flexus could remarkablydecrease the corrosion resistance of the coating and potentially result in degradation of the coating. Inaddition, scanning electron microscopy (SEM) was employed for characterizing the surface morphologyof the coatings before and after immersion. After 30 days of immersion, chalking traces and some tinyholes emerged on the surface of the coatings exposed to seawater containing Bacillus flexus, which wasmainly ascribed to the biofilm formed by Bacillus flexus and their metabolic activities. The resultsdemonstrated that the epoxy resin varnish coating was degraded by Bacillus flexus, which was furtherconfirmed by the results obtained from Fourier transform infrared spectroscopy (FTIR).
机译：保护涂层已被广泛地应用于金属材料的表面上以防止腐蚀。然而，关于由海水中的微生物侵袭引起的涂层降解的知之甚少。作为最广泛的物种之一，芽孢杆菌属物种在材料的降解和降解中非常重要。本文研究了柔韧性芽孢杆菌对海水中环氧树脂清漆涂层降解的影响。所有实验均在无菌海水或含弯曲芽孢杆菌的海水中进行。用电化学阻抗谱（EIS）监测两种海水中涂层的电化学特性。与浸泡在无菌海水中相比，浸泡在浸泡1天至浸泡19天之间暴露于含弯曲芽孢杆菌的海水中的涂层的耐蚀性下降明显更大，这表明弯曲芽孢杆菌可显着降低涂层的耐蚀性并可能导致在涂层的降解。另外，采用扫描电子显微镜（SEM）来表征涂层在浸没之前和之后的表面形态。浸泡30天后，暴露于含弯曲芽孢杆菌海水的涂层表面上出现粉化痕迹和一些小孔，主要归因于弯曲芽孢杆菌形成的生物膜及其代谢活性。结果表明，挠曲芽孢杆菌降解了环氧树脂清漆涂层，傅立叶变换红外光谱（FTIR）获得的结果进一步证实了环氧树脂清漆涂层的降解。

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