Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2021-12-23 , DOI: 10.1016/j.jtice.2021.104176 Wenhui Yao 1, 2 , Yonghua Chen 1 , Liang Wu 1, 2 , Bin Jiang 1, 2 , Fusheng Pan 1, 2
|
Background
The relatively poor corrosion resistance of magnesium (Mg) alloys significantly restricts their extensive applications in industry despite their superior properties such as good electromagnetic shielding, low density, and good biocompatibility. The formation of a protective coating, especially a hydrophobic coating, can provide corrosion protection for the underlying Mg alloys.
Methods
Herein, a slippery liquid-infused porous surface (SLIPS) with good hydrophobicity was developed by infusing MgAlLa-layered double hydroxide (LDH) with silicone oil. In particular, the MgAlLa-LDH was intercalated with sodium benzoate to further improve the corrosion resistance.
Significant Findings
A homogeneous liquid layer was generated on the SLIPS, which can effectively prevent corrosion from external corrosive species. Compared with a superhydrophobic coating, the SLIPS showed better corrosion protection in both electrochemical and immersion tests, attributed to the better stability of liquid layer than air pockets. After immersion in 3.5 wt.% NaCl solution for 7 days, no obvious corrosion was observed on the SLIPS. Moreover, the SLIPS presents good self-cleaning and self-healing properties. These good performances made the SLIPS possible to be extensively applied in practice.
中文翻译：
基于MgAlLa层状双氢氧化物的光滑液体注入多孔表面的制备对AZ31镁合金的有效腐蚀保护
背景
尽管镁（Mg）合金具有良好的电磁屏蔽、低密度和良好的生物相容性等优异性能，但其相对较差的耐腐蚀性能极大地限制了其在工业上的广泛应用。保护涂层的形成，尤其是疏水涂层，可以为下面的镁合金提供腐蚀保护。
方法
在此，通过将 MgAlLa 层状双氢氧化物 (LDH) 与硅油注入，开发了具有良好疏水性的光滑液体注入多孔表面 (SLIPS)。特别是，MgAlLa-LDH 嵌入苯甲酸钠以进一步提高耐腐蚀性。
重要发现
在 SLIPS 上产生了均匀的液体层，可以有效地防止外部腐蚀性物质的腐蚀。与超疏水涂层相比，SLIPS 在电化学和浸没试验中都表现出更好的腐蚀保护，这归因于液层比气穴更好的稳定性。在 3.5 wt.% NaCl 溶液中浸泡 7 天后，SLIPS 上没有观察到明显的腐蚀。此外，SLIPS 具有良好的自清洁和自修复性能。这些良好的性能使 SLIPS 在实践中得到广泛应用。
京公网安备 11010802027423号