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首页> 外文期刊>Journal of Electroanalytical Chemistry: An International Journal Devoted to All Aspects of Electrode Kinetics, Interfacial Structure, Properties of Electrolytes, Colloid and Biological Electrochemistry >Influence of extracellular polymeric substances (EPS) from Pseudomonas NCIMB 2021 on the corrosion behaviour of 70Cu-30Ni alloy in seawater
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Influence of extracellular polymeric substances (EPS) from Pseudomonas NCIMB 2021 on the corrosion behaviour of 70Cu-30Ni alloy in seawater

机译：假单胞菌NCIMB 2021的细胞外聚合物（EPS）对70Cu-30Ni合金在海水中腐蚀行为的影响

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摘要

Copper alloys, often used in cooling circuits of industrial plants using seawater as coolant, can be affected by biocorrosion induced by biofilm formation. Extracellular polymeric substances (EPS) produced by bacteria play a fundamental role in the different stages of biofilm formation, maturation and maintenance. The influence of loosely bound (LB) and tightly bound (TB) EPS, extracted from marine Pseudomonas NCIMB 2021, on the electrochemical behaviour of 70Cu-30Ni (wt.%) alloy in static artificial seawater (ASW) and on the chemical composition of oxide layers was studied by combined electrochemical measurements (polarization curves, EIS) and surface analysis (XPS, ToF-SIMS). Results were compared with those obtained in the presence of bovine serum albumin (BSA), a model protein. Compared to 70Cu-30Ni alloy in static ASW without biomolecules, for which a thick duplex oxide layer (outer redeposited Cu2O layer and inner oxidized nickel layer) is shown, the presence of BSA, TB EPS and LB EPS leads to a mixed oxide layer (oxidized copper and nickel) with a lower thickness. In the biomolecules-containing solutions, this oxide layer is covered by an adsorbed organic layer, mainly composed of proteins. A model is proposed to analyse impedance data obtained at the corrosion potential. The fitting procedure of impedance diagrams allows extracting the anodic charge transfer resistance, from which the corrosion current density can be calculated. The results show a slow-down of the anodic reaction in the presence of biomolecules (BSA, TB EPS and LB EPS), and a corrosion inhibition effect by LB EPS and to a lesser extent by BSA. No detrimental effect is evidenced with TB EPS. (C) 2014 Elsevier B.V. All rights reserved.
机译：铜合金经常用在使用海水作为冷却剂的工厂的冷却回路中，它会受到生物膜形成引起的生物腐蚀的影响。细菌产生的细胞外聚合物（EPS）在生物膜形成，成熟和维持的不同阶段起着基本作用。从海洋假单胞菌NCIMB 2021中提取的松散结合（LB）和紧密结合（TB）的EPS对70Cu-30Ni（wt。％）合金在静态人工海水（ASW）中的电化学行为以及其化学成分的影响通过组合电化学测量（极化曲线，EIS）和表面分析（XPS，ToF-SIMS）研究了氧化层。将结果与在模型蛋白牛血清白蛋白（BSA）存在下获得的结果进行比较。与没有生物分子的静态ASW中的70Cu-30Ni合金相比，其显示出较厚的双相氧化物层（外部再沉积的Cu2O层和内部氧化的镍层），而BSA，TB EPS和LB EPS的存在导致混合氧化物层（氧化铜和镍）的厚度较低。在含有生物分子的溶液中，该氧化物层被主要由蛋白质组成的吸附有机层覆盖。提出了一个模型来分析在腐蚀电位下获得的阻抗数据。阻抗图的拟合过程允许提取阳极电荷转移电阻，由此可以计算出腐蚀电流密度。结果表明，在存在生物分子（BSA，TB EPS和LB EPS）的情况下，阳极反应的速度减慢，LB EPS和BSA在较小程度上抑制了腐蚀作用。 TB EPS没有证据表明有害作用。 （C）2014 Elsevier B.V.保留所有权利。

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