Microbial Corrosion Resistance and Antibacterial Property of Electrodeposited Zn-Ni-Chitosan Coatings
Microbial Corrosion Resistance and Antibacterial Property of Electrodeposited Zn-Ni-Chitosan Coatings
复制标题
电沉积Zn-Ni-壳聚糖涂层的耐微生物腐蚀性能和抗菌性能
DOI：
10.3390/molecules24101974
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发表时间：
2019-05-02
期刊：
影响因子：
4.6
通讯作者：
Hou, Baorong
中科院分区：
文献类型：
--
作者：
Zhai, Xiaofan;Ren, Yadong;Hou, Baorong
微生物腐蚀是海水和废水环境等咸水介质中的普遍现象。 Zn-Ni合金镀层作为一种高效的钢铁防护金属镀层，在微生物腐蚀条件下会加速其损伤。为了解决这个问题，将壳聚糖（一种被认为具有高抗菌效率的天然产物）添加到Zn-Ni电解液中作为电沉积Zn-Ni-壳聚糖涂层的功能成分。研究发现，壳聚糖的添加显着降低了电沉积电位，并影响了镍含量、相组成和表面形貌。通过将涂层暴露在硫酸盐还原菌介质中，研究了其耐微生物腐蚀性能。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菌（SRB）表现出明显的抑制作用，且涂层的腐蚀速率得到一定程度的降低。对浸入大肠杆菌悬浮磷酸盐缓冲盐水介质中的涂层的进一步研究表明，涂层表面的细菌附着有效减少，抗菌性能增强。结果，Zn-Ni-壳聚糖涂层表现出显着增强的防腐和抗菌性能。
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.