Quinoline Derivatives And Their Inhibition Performance

Metal corrosion is a big problem throughout all areas of the national economy, and harms the world's economy every year very seriously.Many measures have been taken in order to reduce the losses caused by metal corrosion. Corrosion inhibitors have been widely used in the production and processing of petroleum products, industrial water, chemical cleaning, machine, instrument manufacturing, atmospheric environment and petrochemical production process effective for their high economic efficiency, and have become a very important measure to protect metals from corrosion. Nowadays,N heterocyclic series for their excellent corrosion inhibition performance are becoming a hot research. Quinoline derivatives as a kind of important N-heterocyclic compounds are easy to be synthesized and readily available and have recived a growing body of research.Four kinds of quinoline derivatives were involved in this paper.The inhibiting per-formance in 1 mol/L H2SO4 were evaluated by electrochemical test and molecular dy-namics modeling, the mechanism of the corrosion inhibition of these derivatives were also analysised,and a possible adsorption model was proposed. The main contents are as follows:In the paper, four kinds of quinoline derivatives are selected and synthesised:3-acetyl-2-methyl quinoline-4-carboxylic acid,6-chloroquinoxaline,1,4-dihydro-6,7-dimethyl-2,3-Quinox-alinedione and 2(1H)-Quinoxalinethione.The target products are comfirmed by IR, MS and 1H-NMR.The corrosion performance of quinolinederivatives were determined through polariz ation curves, and it was found that this kind of compounds can both inhibit the react-ions of anode and cathode corrosion, and is an excellent kind of mixed-type inhibitor.A model of inhibitor-water-metal interface was built with Materials Studio 4.0 so-ftware to study the adsorption and film-forming behaviors of quinoline derivatives on Fe (110) surface in aqueous environment through molecular dynamics simulations.