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铁素体—马氏体钢在超临界水中的腐蚀行为研究.docx

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铁素体—马氏体钢在超临界水中的腐蚀行为研究 Title:CorrosionBehaviorofMartensiticSteelinSupercriticalWater:AStudy Abstract: Supercriticalwater,duetoitsdistinctivephysicochemicalproperties,hasdrawnsignificantinterestasacoolantinnuclearpowerplants.However,thecorrosionresistanceofmaterials,particularlymartensiticsteels,remainsaconcerninthisextremeenvironment.Thisstudyaimstoinvestigatethecorrosionbehaviorofmartensiticsteelinsupercriticalwaterbyexaminingthetransformationofferritetomartensite,theeffectoftemperatureandpressureoncorrosion,andtheroleofwaterchemistry. Introduction: Supercriticalwaterreferstowateraboveitscriticalpoint,characterizedbyhightemperature(Tc=374.15°C)andpressure(Pc=22.1MPa).Itexhibitsunusualproperties,includingalowerviscosity,highdiffusivity,andamodifiedsolubilitybehavior,leadingtochallengesinthedesignandoperationofsystemsutilizingsupercriticalwaterasacoolant.Inparticular,martensiticsteels,commonlyemployedinnuclearreactorsandhigh-temperatureapplications,mayexperiencesignificantcorrosioninthisaggressiveenvironment. Methods: Tounderstandthecorrosionbehaviorofmartensiticsteelinsupercriticalwater,variousexperimentalstudieshavebeenconducted.Theseincludeexposuretests,electrochemicalmeasurements,surfaceanalysis,microstructuralcharacterization,andthermodynamicmodeling. ResultsandDiscussion: 1.PhaseTransformation:Thepresenceofsupercriticalwaterleadstoatransformationofferritetomartensiteinthesteelmatrix,alteringthematerial'smicrostructureandmakingitmoresusceptibletocorrosion.Thehightemperatureandpressureconditionsfavorthedissolutionofcarbonandchromium,leadingtotheformationofcarbidesandthebreakdownofthepassivatingoxidefilm. 2.EffectofTemperatureandPressure:Highertemperaturesandpressuresinsupercriticalwateracceleratethecorrosionrateofmartensiticsteel.Elevatedtemperatureenhancesthekineticsofcorrosionreactionsbyincreasingtheatomicdiffusionrateandpromotingthedissolutionofprotectiveoxidelayers.Pressureinfluencesthewaterchemistry,alteringtheconcentrationofdissolvedoxygen,hydrogen,andotherc