羧基化氧化石墨烯对铌和钽表面缓蚀作用的实验与理论研究

Experimental and Theoretical Studies on Corrosion Inhibition of Niobium and Tantalum Surfaces by Carboxylated Graphene Oxide.

作者信息

Mehmeti Valbonë, Podvorica Fetah I

机构信息

FNMS, Department of Chemistry, University of Prishtina, Prishtina 10000, Kosovo.

出版信息

Materials (Basel). 2018 May 26;11(6):893. doi: 10.3390/ma11060893.

DOI:10.3390/ma11060893

PMID:29861434

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6024923/

Abstract

The corrosion of two different metals, niobium and tantalum, in aqueous sulfuric acid solution has been studied in the presence and absence of carboxylated graphene oxide. Potentiodynamic measurements indicate that this nanomaterial inhibits corrosion due to its adsorption on the metal surfaces. The adsorbed layer of carboxylated graphene hinders two electrochemical reactions: the oxidation of the metal and the transport of metal ions from the metal to the solution but also hydrogen evolution reaction by acting as a protective barrier. The adsorption behavior at the molecular level of the carboxylated graphene oxide with respect to Nb, NbO, Ta, and TaO (111) surfaces is also investigated using Molecular Dynamic and Monte Carlo calculations.

摘要

在有和没有羧基化氧化石墨烯存在的情况下，研究了两种不同金属铌和钽在硫酸水溶液中的腐蚀情况。动电位测量表明，这种纳米材料由于吸附在金属表面而抑制了腐蚀。羧基化石墨烯的吸附层阻碍了两个电化学反应：金属的氧化以及金属离子从金属向溶液的传输，而且还通过充当保护屏障阻碍了析氢反应。还使用分子动力学和蒙特卡洛计算研究了羧基化氧化石墨烯在分子水平上对Nb、NbO、Ta和TaO(111)表面的吸附行为。