镍和钴对反应钢镀锌组织和生长动力学的影响-材料学专业论文.docx

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镍和钴对反应钢镀锌组织和生长动力学的影响-材料学专业论文.docx

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镍和钴对反应钢镀锌组织和生长动力学的影响-材料学专业论文

AbstractThegalvanizingiswidelyappliedtosteel’santicorrosion.Highstrengthlow alloystructuralsteelwhichisusedingeneralgalvanizingcontainshighsilicon.Thesiliconreactivity,knownasSandelineffect,bringsadetrimentalinfluenceonthequalityofthegalvanizedcoating.TheeffectofNiandCoinZnbathonthemicrostructures,growthkineticsandanticorrosionpropertiesofhot-dipgalvanized coatingofQ235andQ345steelswereinvestigatedusingopticalmicroscopy,SEM, SEM-EDSandSEM-WDS.Resultsshowthataddingover0.05wt%NiorCoinZnbathcancompletelycontrolthesiliconreactivityandreducethethinknessofthegalvanizedcoating.ButfortheQ345steelitonlycontrolsthesiliconreactivitypartiallyevenupto0.3wt% wereadded.ThemicrostructuresofthegalvanizedcoatinghavebeeninvestigatedwithSEM. TheresultsshowthatthegalvanizedcoatingsofQ235steelwhichisdippedinNior Cozincbathhavethesimilarmicrostructures:suchastheintermediatephasesinthecoatingarecomposedofΓ,δandζ.Thethinknessofζbecomesthinnerandthethinknessofδbecomesthickerrelativetopurezincbath.ThedifferenceisthatthegalvanizedcoatingcontainingNihasalayerofΤ(Zn-Fe-Ni)particlesbetweenζandη,andthethicknessofδisthickerthanthatofζ;ButforaddingCointheZnbaththeloosenζhastransformedintotheCo-richζwhichcomefromtheLiquidandthecompactζwhichcomefromconsumingδ,andthethicknessofδislessthanthatofζ. ThemicrostructureofeachintermediatephaseofQ345steeliscomposedofδandζ. SomeDiffused-Δdistributesinthecoating,andtheintermediatephaseisprimary composedbyζphase.ThereasonofaddingNiinzinctocontrolsiliconreactivityhasbeengiven.For thesteelcontainingless0.2%Si,NirichesontheζandηphaseboundarytoformtheZn-Fe-Niternaryphase,theΤphase.Asaresult,itcanchangegrowingprocess ofζcrystallites.Meanwhile,theΤservesasabarrierlayerpreventingthedirectcontactofmoltenZnwiththeδphase.ThestudyontheCoandSidistributioninthegalvanizedcoatingwithSEM-WDSwasfoundthattheloosenζlayerwastransformedintotheCo-richζ layercontacteddirectlywithliquidandthecompactζlayerformedbyconsumingδ afteraddingasmallamountofCointheZnbath.Thecompactζlayercanpreven