Inhibition Mechanism of 2-Aminopyrimidine for Copper Corrosion

Liu, Z. H.; Wang, F. C.; Tian, Z. Q.; 田中群,

doi:10.3866/pku.whxb19920116

Cited by 4 publications

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“…3 Asanimportantkindof N-heterocycliccompound,pyrimidinederivativeswhosemoleculespossessthepyrimidinering withtwoNheteroatomscouldalsobedeemedasgoodpotentialinhibitors.2-Mercaptopyrimidine(MP)wasreportedasa goodcorrosioninhibitorfornon-ferrousmetalsinacidmedia, suchaszincinHClsolution, 4 aluminiuminHClsolution, 5 cop-perinH 2 SO4 solution. 6 Besidesnon-ferrousmetals,theinhibitioneffectsofpyrimidinederivativesonthesteelcorrosionin acidmediawerestudied.In1993,Zucchi etal. 7 investigated thecorrosioninhibitionofsteelinH2SO4 solutionbysomepyrimidinederivatives.In2001,Wang 8 reportedthecorrosionin-hibitionbyMPforsteelinH 3 PO4 solution,andthemaximum inhibitionefficiency( η )in3.0mol•L − 1 H3PO4 solutionis98% at10.0mmol•L − 1 .Accordingtoourrecentwork, 9 2-aminopyrimidne(AP)alsoactsasagoodcorrosioninhibitoronthecor-rosionofsteelin1.0mol•L − 1 HClsolution,andthe η is92.4% at20°CwhentheconcentrationofAPis10.0mmol•L −1 .However,anotherpyrimidinederivativeofuracil(Ur)exhibitspoor inhibitiveabilityforsteelinH 3 PO4 10 andH 2 SO4 11 solutions.…”

Section: Introductionmentioning

confidence: 99%

Inhibition Effect of Pyrimidine Derivatives on the Corrosion of Steel in Hydrochloric Acid Solution

Li¹,

云南大学化学科学与工程学院²,

Xiao-Guang³

2013

Acta Physico-Chimica Sinica

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Theinhibitioneffectoftwopyrimidinederivatives,2-hydroxypyrimidine(HP)and2mercaptopyrimidine(MP),onthecorrosionofcoldrolledsteel(CRS)in1.0−5.0mol•L −1 HClisinvestigated bymassloss,potentiodynamicpolarizationcurves,electrochemicalimpedancespectroscopy(EIS),and quantumchemicalcalculations.TheresultsshowthatHPandMParebothgoodinhibitorsofcorrosionof CRSin1.0mol•L − 1 HClsolution.TheadsorptionoftheseinhibitorsontotheCRSsurfaceobeystheLangmuir adsorptionisotherm.Inhibitionefficiencyincreaseswithinhibitorconcentration,anddecreaseswith hydrochloricacidconcentration.Thethermodynamicparametersofadsorption(adsorptionequilibrium constant( K )andadsorptionfreeenergy( Δ G 0 ))andkineticparametersofcorrosion(apparentactivation energy( E a ),pre-exponentialfactor( A ),corrosionrateconstant( k ),andkineticreactionconstant( B ))are alsocalculated.Basedontheseparameters,themechanismofinhibitionisdiscussed.Potentiodynamic polarizationcurvesshowthatHPandMPactasmixed-typeinhibitors.EISexhibitonecapacitiveloop,and thechargetransferresistanceincreaseswithinhibitorconcentration.Theresultsofquantumchemical calculationsindicatethatMPexhibitshigheradsorptiveabilitythanHP,whichisingoodagreementwiththe experimentaldata.

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Section: Introductionmentioning

confidence: 99%