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Microbial Corrosion Resistance and Antibacterial Property of Electrodeposited Zn–Ni–Chitosan Coatings

机译：电沉积Zn-Ni-壳聚糖涂层的耐微生物腐蚀性能和抗菌性能

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摘要

Microbial corrosion is a universal phenomenon in salt water media such as seawater and wastewater environments. As a kind of efficient protective metal coating for steel, the damage of the Zn–Ni alloy coating was found to be accelerated under microbial corrosive conditions. To solve this problem, chitosan, which is considered a natural product with high antibacterial efficiency, was added to Zn–Ni electrolytes as a functional ingredient of electrodeposited Zn–Ni–chitosan coatings. It was found that the addition of chitosan significantly and negatively shifted the electrodeposition potentials and influenced the Ni contents, the phase composition, and the surface morphologies. By exposing the coatings in a sulfate-reducing bacteria medium, the microbial corrosion resistance was investigated. The results showed that compared to the Zn–Ni alloy coating, Zn–Ni–chitosan coatings showed obvious inhibiting effects on sulfate-reducing bacteria (SRB) and the corrosion rates of these coatings were mitigated to some degree. Further research on the coatings immersed in an Escherichia coli-suspended phosphate buffer saline medium showed that the bacteria attachment on the coating surface was effectively reduced, which indicated enhanced antibacterial properties. As a result, the Zn–Ni–chitosan coatings showed remarkably enhanced anticorrosive and antibacterial properties.
机译：微生物腐蚀是咸水介质（例如海水和废水环境）中的普遍现象。作为一种有效的钢保护金属涂层，发现在微生物腐蚀条件下，锌镍合金涂层的破坏会加速。为了解决这个问题，将被认为具有高抗菌效率的天然产物壳聚糖作为电沉积锌-镍-壳聚糖涂层的功能成分添加到了锌-镍电解质中。已经发现，壳聚糖的添加显着地且负地移动了电沉积电位并且影响了Ni含量，相组成和表面形态。通过将涂层暴露在减少硫酸盐的细菌培养基中，研究了微生物的耐腐蚀性。结果表明，与Zn-Ni合金涂层相比，Zn-Ni-壳聚糖涂层对硫酸盐还原细菌（SRB）具有明显的抑制作用，并且这些涂层的腐蚀速率有所减轻。对浸没在大肠杆菌悬浮的磷酸盐缓冲盐水中的涂层的进一步研究表明，有效减少了涂层表面的细菌附着，这表明增强了抗菌性能。结果，Zn-Ni-壳聚糖涂层显示出显着增强的防腐和抗菌性能。

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