Fluorine substituted thiomethyl pyrimidine derivatives as efficient inhibitors for mild steel corrosion in hydrochloric acid solution: Thermodynamic, electrochemical and DFT studies

Three new 5-fluoro-2- methylthio substituted pyrimidine derivatives have been synthesized and characterized by H-1 NMR spectroscopy and Mass spectrometry. Corrosion inhibition characteristics of the synthesized pyrimidine derivatives have been studied on mild steel (MS) in 0.5 M hydrochloric acid solution at various temperatures (303-333 K) using mass loss and electrochemical techniques. The obtained weight loss, electrochemical impedance and potentiodynamic polarization data indicate that the corrosion inhibition efficiency is directly proportional to concentration of the inhibitors. The Adsorption process on MS surface obeyed Langmuir isotherm model. Scanning electron microscopy (SEM) was used to characterize surface morphology of the MS specimen in absence and presence of pyrimidine derivatives. Density functional theory (DFT) calculations using B3LYP functional with 6-311+G (d,p) level was used to establish the relationship between molecular structure and corrosion inhibition efficiency. Electrochemical analysis indicated that pyrimidine derivatives inhibit the corrosion by adsorbing on the metal surface. Mixed-type of corrosion inhibition activity with anodic predominance was proposed by polarization studies. (C) 2020 Elsevier B.V. All rights reserved

Permanent Genetic Resources added to Molecular Ecology Resources Database 1 October 2009–30 November 2009.

5 pagesInternational audienceThis article documents the addition of 411 microsatellite marker loci and 15 pairs of Single Nucleotide Polymorphism (SNP) sequencing primers to the Molecular Ecology Resources Database. Loci were developed for the following species: Acanthopagrus schlegeli, Anopheles lesteri, Aspergillus clavatus, Aspergillus flavus, Aspergillus fumigatus, Aspergillus oryzae, Aspergillus terreus, Branchiostoma japonicum, Branchiostoma belcheri, Colias behrii, Coryphopterus personatus, Cynogolssus semilaevis, Cynoglossus semilaevis, Dendrobium officinale, Dendrobium officinale, Dysoxylum malabaricum, Metrioptera roeselii, Myrmeciza exsul, Ochotona thibetana, Neosartorya fischeri, Nothofagus pumilio, Onychodactylus fischeri, Phoenicopterus roseus, Salvia officinalis L., Scylla paramamosain, Silene latifo, Sula sula, and Vulpes vulpes. These loci were cross-tested on the following species: Aspergillus giganteus, Colias pelidne, Colias interior, Colias meadii, Colias eurytheme, Coryphopterus lipernes, Coryphopterus glaucofrenum, Coryphopterus eidolon, Gnatholepis thompsoni, Elacatinus evelynae, Dendrobium loddigesii Dendrobium devonianum, Dysoxylum binectariferum, Nothofagus antarctica, Nothofagus dombeyii, Nothofagus nervosa, Nothofagus obliqua, Sula nebouxii, and Sula variegata. This article also documents the addition of 39 sequencing primer pairs and 15 allele specific primers or probes for Paralithodes camtschaticus