Nanocatalyst-mediated oxygen depletion in epoxy coating for active corrosion protection
Nanocatalyst-mediated oxygen depletion in epoxy coating for active corrosion protection
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纳米催化剂介导的环氧涂层中的氧消耗，用于主动腐蚀防护
DOI：
10.1016/j.cej.2021.131649
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发表时间：
2021-12
影响因子：
15.1
通讯作者：
Songqing Hu
中科院分区：
文献类型：
--
作者：
Meng Cheng;Hao Jiang;Zhikun Wang;Chunling Li;Shuangqing Sun;Songqing Hu
依赖于外部纳米容器的智能涂层通常复杂且昂贵，其只能依赖于腐蚀后微环境的变化来抑制局部腐蚀。在这项工作中，纳米催化防腐的基础上，二氧化硅包覆富氮空心碳球（NHCs@mSiO2）的开发，以实现涂层寿命的延长和长期保护的金属。通过受限空间热解策略获得的NHCs@mSiO2显示出内部为N掺杂碳壳和外部为二氧化硅壳的双壳中空结构。此外，NHCs@mSiO2球由于氮的引入而具有良好的氧催化能力。两亲性NHCs@mSiO2微球在环氧树脂涂层中均匀分布，占据涂层中的孔隙或裂纹。通过涂层微孔扩散的氧优先被NHCs@mSiO2吸附，并通过四电子途径直接还原为水。因此，大大避免了由于氧的耗尽而引起的腐蚀。具有优异分散性和氧还原能力的纳米催化剂的引入，将为开发新型的主动耐腐蚀智能涂料铺平道路。
Smart coatings depending on external nanocontainers are often complex and expensive, which can only inhibit local corrosion depending on the microenvironment change after corrosion. In this work, nanocatalytic anticorrosion based on silica coated nitrogen enriched hollow carbon spheres (NHCs@mSiO2) is developed to achieve the prolongation of coating lifetime and long-term protection of metals. Obtained NHCs@mSiO2by confined space pyrolysis strategy shows a double-shelled hollow structure with interior N-doped carbon shell and exterior silica shell. Moreover, the NHCs@mSiO2spheres possess favorable catalytic ability for oxygen thanks to the incorporation of nitrogen. When blended into epoxy coatings, amphiphilic NHCs@mSiO2spheres distribute uniformly and occupy the pores or cracks in composite coatings. The diffused oxygen through coating micropores are preferentially adsorbed by NHCs@mSiO2and directly reduced to water through four-electron pathways. Therefore, the corrosion is greatly avoided due to the depletion of oxygen. The introduction of nano-catalyst with excellent dispersity and oxygen reduction ability will pave the way toward the development of new smart coatings with active corrosion resistance.
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