Contact
    Start Publications Bionic Tea Stain-Like, All-Nanoparticle Coating for ...
    ←  Publication Finder
    Attension

    Bionic Tea Stain-Like, All-Nanoparticle Coating for Biocompatible Corrosion Protection

    Year: 2019

    Journal: Adv. Mater. Interfaces, Volume 6, OCT

    Authors: Zhang, Bo; Yao, Ruijuan; Li, Linhuo; Li, Mingyu; Yang, Li; Liang, Zhen; Yu, Hongchi; Zhang, Hao; Luo, Rifang; Wang, Yunbing

    Organizations: National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51703144]; National Key Research and Development Program [2016YFC1102200]; 111 Project (The Program of Introducing Talents of Discipline to Universities) [B16033]

    Keywords: biocompatible; corrosion protection; magnesium alloy; nanoparticle conversion coating; tea stain like

    Magnesium alloys are biodegradable metals, but high corrosion speed and low histocompatibility after implantation still limit the application as biomedical implants. In this work, a bionic coating concept is put forward via mimicking a continuous "tea stain" formation process, using a layer-by-layer approach. Tannic acid (TA) incorporating Mg2+ ions is used to form a chemical conversion coating on magnesium AZ31 alloy for enhanced corrosion protection and favorable biocompatibility. Thermal oxidation of TA, along with metal-phenol coordination and aggregation, forms an all nanoparticles stacked coating, which is crack-free, homogeneous, more tight, and dense than the pure TA coating. In electrochemical corrosion tests, pH monitoring, and hydrogen evolution tests, the corrosion rate is effectively decreased for the TA/Mg protected AZ31, which is ascribed to the enriched phenol-metal complex and enhanced connections between the individual nanoparticles. With such green chemistry, the introduction of TA and incorporation of Mg2+ synergistically endow the basic requirement of corrosion protection, without cytotoxicity to endothelial cells and with a safe hemolysis ratio. Additionally, this bionic coating effectively suppresses the inflammatory response to AZ31. These results convincingly demonstrate the effectiveness of using such coating as a biocompatible barrier for the potential application of biodegradable magnesium implants.
    View publication