西南交大材料成型表面工程期末考试总结

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1、ChapterlQI:whysurfacingcoating?Al:l.Greatlyimprovethesurfaceperformsnee,theuseefficiencyofmaterial,servicelifeoftheequipment.2.Savingexpensivematerial,resource,labor;andreducethecost.3.Differentpropertyneededforsurfaceandbulkthatonlycoatingcansatisfy.Chapter2QI:characterizatio

2、nmethodsofcoatingsandthinfilmsAl:rThickness―opticalmicroscopyMorphology…SEMComposition■一XRDMechanicalcharacterizationHardness—microhardnessandnanahardnesstester（显微硬度仪）Adhesion―ScratchtesterQ2:TypicalsurfaceofsolidAl:1.idealsurface!完美晶格）2.cleansurface（表而和内部结构不同，但化学成分相同）3.actual

3、surface（结构成分都不同）Q3:WearA3:abrasionerosionadhesionsurfacefatigueQ4:ThediffereneeofthemechanismbetweenadhesiveandabrasionWear?MechanismofAbrasion:abrasivewearisdefinedaswearduetohardparticlesandprotuberaneeforcedagainstandmovingalongasolidsurface・Mechanismofadhesive:adhesivewear

4、isdefinedaswearbytransferenceofmaterialfromasurfacetoanotherduringarelativemotionunderload.Particlesremovefromonesurfaceareeitherpermanentlyortemporarilytoattachtoanothersurface.Chapter3QI:whatmusthaveforacorrosiontooccurinmetals?Al:forcorrosionoccursinmetals,onemusthave:1.ane

5、lectrolyte2.anareaorregiononametallicsurfacewithnegativecharge3.anotherareawithpositivecharge4.anelectricallyconductivepathbetween2and3Q2:ClassificationandpreventionofsurfacecorrosionA2：Uniformcorrosion（全ifif腐蚀，其余全部是部分腐蚀）GalvaniccorrosionPittingcorrosionIntergranularcorrosionS

6、tresscorrosion・crackingQ3:thedifferencesofthemechanismbetweenintergranularcorrosionandSCC?A3:intergranularcorrosion:thetypeofattackresultfromthediffereneeoflocalcomposition.theselectivedissolutionofgrainboundaryoradjacentareaattackofthegrainsthemselves・SCC:SCCisacrackingphenom

7、enonoccursinansusceptiblealloycausedbytheconjunctionactionofthesurfacetensilestressandthepresenceofaspecialcorrosionenvironment・see形成的三个必要条件：1.促裂环境2.应力腐蚀敏感合金3.超阈值应力Q4:Givesomeexampleforcorrosionresistantcoating?A4:1.Sacrificialcoating2.Barriercoating3.Variouspolymercoating.Cha

8、pter4Keypoint:Dimensions:0-D:powersD:multi-layerfilmsorwires2