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工艺参数对Q345钢表面锌-钙系磷化膜耐蚀性的影响.docx

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工艺参数对Q345钢表面锌-钙系磷化膜耐蚀性的影响 Title:InfluenceofProcessParametersontheCorrosionResistanceofZinc-CalciumPhosphateCoatingonQ345Steel Abstract: Inrecentyears,thedevelopmentofcorrosion-resistantcoatingsforsteelsurfaceshasgainedsignificantattentionduetotheirabilitytoenhancethedurabilityandlifespanofsteelstructures.Amongthevariouscoatingoptions,zinc-calciumphosphatecoatingshaveshowngreatpotentialinprovidingexcellentcorrosionresistance.Thispaperaimstoinvestigatetheinfluenceofprocessparametersonthecorrosionresistanceofzinc-calciumphosphatecoatingsonQ345steelsurfaces. Introduction: Corrosionisamajorconcernforsteelstructuresinvariousindustries,includingconstruction,automotive,andmanufacturing.Zinc-calciumphosphatecoatingshaveemergedasapromisingsolutionforimprovingthecorrosionresistanceofsteelsurfaces.Thesecoatingsnotonlyprovideabarrieragainstenvironmentalfactorsbutalsocanundergoself-healingwhendamaged,therebyenhancingtheirlongevity. Methodology: 1.Q345steelsurfacepreparation:TheQ345steelsampleswerepreparedbycleaningthesurfaceusingaseriesofchemicaltreatmentssuchasdegreasing,pickling,andrinsing. 2.Zinc-calciumphosphatecoatingdeposition:Theprocessparameters,includingconcentration,pH,temperature,andimmersiontime,werevariedtoanalyzetheirinfluenceonthecorrosionresistanceofthecoating.Coatingsweredepositedusingvariousconcentrationsofzincandcalciumphosphates,differentpHsolutions,andatvariabletemperaturesandimmersiontimes. 3.Characterizationofcoatings:Thecorrosionresistanceofthecoatingswasevaluatedusingtechniquessuchaselectrochemicalimpedancespectroscopy(EIS)andsaltspraytesting.Themorphologyandcompositionofthecoatingswereexaminedusingscanningelectronmicroscopy(SEM)andX-raydiffraction(XRD). ResultsandDiscussion: 1.Influenceofzincandcalciumphosphateconcentrations:Higherconcentrationsofzincandcalciumphosphatesresultedinthickercoatingswithimprovedcorrosionresistance.However,beyondacertainconcentration,thecoatingqualitydecreasedduetotheformationofprecipitates. 2.pHofthesolution:ThepHofthesolutio