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A novel hybrid composite composed of albumin, WO3, and LDHs film for smart corrosion protection of Mg alloy
Composites Part B: Engineering ( IF 13.1 ) Pub Date : 2020-10-24 , DOI: 10.1016/j.compositesb.2020.108490
Mosab Kaseem , Young Gun Ko

The present study reports for the first time the fabrication of stable smart coatings on AZ31 Mg alloy based on the decoration of layered double hydroxide (LDHs) film by soft protein molecules functionalized by n-type semiconductor nanoparticles. For this goal, the LDHs film fabricated on the plasma electrolysis film of Mg alloy was immersed in a solution containing WO3 nanoparticles functionalized albumin, and the results were compared with the process in which LDH film was immersed in a homogenous solution of albumin. The deposition of ALB modified by WO3 nanoparticles altered the typical morphology of LDH film, forming a nest-like structure that gives rise to potential barrier formation at the interface which hinders ease of charge transport across the layer. Per electrochemical assessments in a 3.5 wt % NaCl solution, it was proposed that albumin modified by WO3 nanoparticles would cut off the electrons-supplying path at the surface of LDH film and transports them to the outside of the primer. Hence, it is assumed that the LDH-ALB-WO3 composite may effectively capture the corrosive ions during the corrosion. The remarkable improvement of the anticorrosion property of this film was connected with the increase in barrier to diffusion, prevention of charge transport by the WO3 nanoparticles modified albumin as well as the very large surface area available for the liberation of dopant due to the flake structure of LDH film. The electrochemical mechanism underlying the high corrosion resistance of the LDH-ALB-WO3 film was also revealed by Mott-Schottky (MS) analysis.



中文翻译:

由白蛋白,WO 3和LDHs膜组成的新型杂化复合材料,用于镁合金的智能腐蚀防护

本研究首次报道了基于AZ31镁合金的稳定智能涂层的制备,该涂层基于由n型半导体纳米粒子功能化的软蛋白分子修饰的层状双氢氧化物(LDHs)膜。为了这个目标,将在Mg合金的等离子电解膜上制造的LDHs膜浸入含有WO 3纳米粒子官能化白蛋白的溶液中,并将结果与​​将LDH膜浸入白蛋白均匀溶液中的过程进行比较。WO 3改性的ALB的沉积纳米粒子改变了LDH膜的典型形态,形成了巢状结构,从而在界面处形成势垒,从而阻碍了电荷在整个层中的传输。根据在3.5 wt%NaCl溶液中的电化学评估,有人提出,用WO 3纳米颗粒改性的白蛋白会切断LDH膜表面的电子供应路径,并将其输送到底漆的外部。因此,假设LDH-ALB-WO 3复合物可以在腐蚀过程中有效地捕获腐蚀性离子。该膜的耐腐蚀性能的显着改善与扩散势垒的增加有关,防止了WO 3的电荷传输纳米颗粒改性的白蛋白,以及由于LDH薄膜的片状结构,可用于释放掺杂剂的非常大的表面积。通过Mott-Schottky(MS)分析还揭示了LDH-ALB-WO 3膜具有高耐腐蚀性的电化学机理。

更新日期:2020-10-30
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