Ag@SiO2纳米复合涂层在大肠杆菌作用下的电化学阻抗谱研究

研究了添加不同含量Ag@SiO₂ 纳米材料的环氧树脂涂层在大肠杆菌溶液中浸泡前和浸泡110h后的电化学阻抗谱特征，分别提出了其等效电路模型，并比较了浸泡前和浸泡850h后的涂层形貌变化。结果表明，浸泡后未添加Ag@SiO₂ 的涂层的阻抗降低了96%，添加0.3%的Ag@SiO₂ 涂层的阻抗也下降了73%，且两者都出现了明显的锈斑；而添加0.1%的Ag@SiO₂ 涂层的阻抗和形貌在浸泡前后基本保持不变。可见，添加适量的Ag@SiO₂ 可以显著提高涂层的耐微生物腐蚀性能。

Electrochemical impedance spectroscopic studies of the effect of Ag@ SiO2 nanocomposites on the corrosion of epoxy coatings influenced in the presence of Escherichia coli

Electrochemical impedance spectra (EIS) of epoxy coatings pigmented with Ag@SiO₂ nanoparticles at different concentrations were recorded before and after immersion for 110 h in Escherichia coli (E. coli ) solution. Corresponding equivalent circuits for the coatings were proposed, and their surface topography before and after immersion for 850 h in E. coli solution was compared. The results showed that after immersion, the resistance of coatings with zero and 0.3% mass ratio of Ag@SiO₂ pigment to resin decreased by 96% and 73%, respectively. Obvious corrosion spots were found on the surfaces of both coatings. However, there was little change in either resistance or topography of the coating containing 0.1% Ag@SiO₂. This shows that the addition of an appropriate amount of Ag@SiO₂ can increase the microbiological corrosion resistance of coatings. nanoparticles at different concentrations were recorded before and after immersion for 110 h in Escherichia coli (E. coli solution. Corresponding equivalent circuits for the coatings were proposed, and their surface topography before and after immersion for 850 h in E. coli solution was compared. The results showed that after immersion, the resistance of coatings with zero and 0.3% mass ratio of Ag@SiO₂ pigment to resin decreased by 96% and 73%, respectively. Obvious corrosion spots were found on the surfaces of both coatings. However, there was little change in either resistance or topography of the coating containing 0.1% Ag@SiO₂. This shows that the addition of an appropriate amount of Ag@SiO₂ can increase the microbiological corrosion resistance of coatings.