Yang Beibei, Dong Jiayu, Bian Haifeng, Lu Haimin, Bin Duan, Tang Shaochun, Song Yaqiong, Lu Hongbin
Department of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China.
Haian Institute of High-Tech Research, College of Engineering and Applied Science, Nanjing University, Nanjing 210033, China.
Nanomaterials (Basel). 2022 Jul 14;12(14):2406. doi: 10.3390/nano12142406.
A self-healing epoxy coating is creatively prepared by employing expired cefalexin loaded into mesoporous silica nanomaterials (MSNs) for corrosion protection of 304 stainless steel (304SS). A series of physical characterizations, including transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectrometer, and N adsorption-desorption isotherms, verified that the cefalexin successfully filled porous MSN. The corrosion resistance of the epoxy (EP) coating incorporated with the cefalexin@MSNs is investigated using a Tafel polarization curve and electrochemical impedance spectra (EIS) in a 3.5 wt.% NaCl solution. It is found that the EP-Cefalexin@MSNs coating has a higher self-corrosion voltage and a lower self-corrosion current density than EP coating. Moreover, the charge transfer resistance (R) value of Cefalexin@MSNs coating is twice that of EP coating after immersion for 24 h, indicating that the cefalexin@MSNs significantly enhance the corrosion resistance of the coating under long-duration immersion. The improved corrosion resistance is attributed to the densified adsorption of the cefalexin inhibiting the cathode corrosion reaction, providing a self-healing long-duration corrosion protection for 304SS.
通过将负载在介孔二氧化硅纳米材料（MSNs）中的过期头孢氨苄用于304不锈钢（304SS）的腐蚀防护，创造性地制备了一种自修复环氧涂层。一系列物理表征，包括透射电子显微镜（TEM）、傅里叶变换红外（FTIR）光谱仪和N吸附-脱附等温线，证实头孢氨苄成功填充了多孔MSN。在3.5 wt.% NaCl溶液中，使用塔菲尔极化曲线和电化学阻抗谱（EIS）研究了掺入头孢氨苄@MSNs的环氧（EP）涂层的耐腐蚀性。结果发现，EP-头孢氨苄@MSNs涂层比EP涂层具有更高的自腐蚀电位和更低的自腐蚀电流密度。此外，浸泡24小时后，头孢氨苄@MSNs涂层的电荷转移电阻（R）值是EP涂层的两倍，这表明头孢氨苄@MSNs在长时间浸泡下显著提高了涂层的耐腐蚀性。耐腐蚀性的提高归因于头孢氨苄的致密吸附抑制了阴极腐蚀反应，为304SS提供了长期的自修复腐蚀防护。
Zotero 插件
