关键词: Artificial seawater Biocorrosion Biofilm Natural inhibitors Plant extracts

Mesh : Steel / chemistry Pseudomonas aeruginosa / physiology Artemisia annua Corrosion Biofilms

来  源:   DOI:10.1016/j.bioelechem.2023.108447

Abstract:
The protective effect of A. annua against microbiologically influenced corrosion (MIC) of A36 steel caused by P. aeruginosa (PA) in a simulated marine environment was investigated using electrochemical, spectroscopic, and surface techniques. PA was found to accelerate the local dissolution of A36 which led to the formation of a porous α-FeOOH and γ-FeOOH surface layer. 2D and 3D profiles of treated coupons, obtained by optical profilometer, revealed the formation of crevices in the presence of PA. On the contrary, adding A. annua to the biotic medium led to the formation of a thinner, more uniform surface without significant damage. Electrochemical data showed that the addition of A. annua prevented the MIC of A36 steel with an inhibition efficiency of 60%. The protective effect was attributed to the formation of a more compact Fe3O4 surface layer, as well as the adsorption of phenolics, such as caffeic acid and its derivatives on the A36 steel surfaces, as detected by FTIR and SEM-EDS analysis. ICP-OES confirmed that Fe and Cr species more readily diffuse from A36 steel surfaces incubated in biotic media (Fe; 1516.35 ± 7.94 μg L-1 cm-2, Cr; 11.77 ± 0.40 μg L-1 cm-2) compared to the inhibited media (Fe; 35.01 ± 0.28 μg L-1 cm-2, Cr; 1.58 ± 0.01 μg L-1 cm-2).
摘要:
使用电化学方法研究了An对模拟海洋环境中铜绿假单胞菌(PA)引起的A36钢的微生物腐蚀(MIC)的保护作用,光谱学,表面技术。发现PA可加速A36的局部溶解,从而形成多孔的α-FeOOH和γ-FeOOH表面层。处理过的试样的2D和3D轮廓,通过光学轮廓仪获得,揭示了在PA存在下裂缝的形成。相反,在生物培养基中加入黄花菊导致稀释剂的形成,表面更均匀,无明显损坏。电化学数据表明,添加A.annua可以抑制A36钢的MIC,抑制效率为60%。保护作用归因于更致密的Fe3O4表面层的形成,以及酚类物质的吸附,如A36钢表面的咖啡酸及其衍生物,通过FTIR和SEM-EDS分析检测。ICP-OES证实,与生物培养基(Fe;1516.35±7.94μgL-1cm-2,Cr;11.77±0.40μgL-1cm-2)相比,Fe和Cr物种更容易从在生物培养基(Fe;35.01±0.28μgL-1cm-2,Cr;1.58±0.01μgL-1cm-2)中孵育的A36钢表面扩散。
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