粉末喷涂与应用

abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDIntroductiontoPowderCoating粉末涂料介绍abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPretreatmentforusewithPowderCoatings金属前处理abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation金属的处理Pretreatmentisaprocessintendedtopreventthecorrosionofthepaintedmetal.前处理是一种提高耐腐蚀的工艺Fe2+O2+H2O=RUSTIronreactswithoxygenandwaterintheatmospherecreatingapowderybrownmess,notveryornamental,andcontinuousuntilnosolidmetalremains.铁在空气中会与氧气和水反应生成褐色的物质abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation金属处理Severalmethodsofcorrosionpreventioncanbeused几种防腐蚀的方法ForSteel:铁：Automotiveapplications汽车业Primer:Underseals:LayersofPaint.abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDSeveralmethodsofcorrosionpreventioncanbeused几种防腐蚀的方法ForSteel:铁：ArchitecturalApplications建筑业Galvanising:AntiCorrosivePrimer*Galvanising–coveringwithalayerofzinc.MetalPreparation金属处理abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation金属处理abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation金属处理Severalmethodsofcorrosionpreventioncanbeused几种防腐蚀的方法ForAluminium:铝：Aluminiumoxidisestoformawhitecorrosionproduct铝被氧化后形成白色的物质ArchitecturalApplications建筑业Anodise:AcidPrimersabcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation金属处理WhyPretreatment?为什么要前处理？Powdercoatingsareusedtoenhancetheappearanceofbuildings,machines,furniture,appliances:粉末涂料用于改善建筑，机械设备，家具，以及其它器具的表面：Designersandarchitectsaresearchingtogivedistinctionintermsofcolourandeffects.设计师和建筑师提供了包括颜色和效果在内的标准等级Theproblemisthatallpaintsareporous：所有的涂料均不同程度的存在会渗水的小孔abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation金属处理Moleculesofwaterandsaltcanpenetratethroughthepaintfilm.Whentheyreachthemetalsurfacetheeffectisworsethanifthemetalisuncoated.Theanswer=Pretreatment水和盐分子可以渗透漆膜，一旦它们与金属表面接触，产生的影响甚至比没有喷涂还要糟糕。要解决这个问题就需要前处理。abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation金属处理Pretreatment:前处理Thechemicalconversionofthemetalsurfacebeforeapplyingthepowdercoating.Themetalthenresistscorrosionandtheconversionpermanentlyimprovestheadhesionofthecoating.在使用粉末涂料以前用化学方法对金属表面进行处理，可以改善耐腐蚀性和增加涂层的附着力。abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation金属处理Theperformanceofthepowdercoatingisonlygoingtobeasgoodasthemetalpreparation.Wewillcoverthreetypesofmetaltreatmentsystems粉末涂料的功能类似于金属处理，我们将介绍三种的金属处理方法IronPhosphateforSteel用于铁系的磷酸铁ZincPhosphateforSteel用于铁系的磷酸锌ChromateforAluminium用于铝的铬酸盐Othersystemscanbeusedandinformationisavailable.当然还有其它处理方法abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation–IronPhosphate金属处理—磷酸铁Metalpretreatmentcanbeappliedbysprayordipping.金属前处理可以借助喷淋或浸渍Inthecaseofironphosphatetheprocesscouldlooklikethis:下面是磷酸铁的工艺流程Stages1,2and3canbeeithersprayordip步骤1，2和3均可采用喷淋或浸渍DRAINDRAINStage1Clean&PhosphateStage2RinseStage3Rinse&SealWorkFlowabcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation–IronPhosphate金属处理—磷酸铁Typical3StageSystem典型的3步骤流程MetalSubstrateSteel–PhosphatisingSystem金属基材NoneFerrous–CleanandEtchStagetimeduration1–90seconds不同步骤所需的时间2–45seconds3–30secondsStagetemperature1，2和3步骤所需的温度40–60oCDrying/干燥温度100–120oCTypicalconcentration2–3%byvolume典型的浓度Typicalacidity典型的酸值pH3.5–5.5Typicalcoatingweight典型的膜重20–40mg/ft.abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation–ZincPhosphate金属处理–磷酸锌ZincPhosphateprocessforsteeltendstobemorecomplicated磷酸锌的工艺流程复杂一些Stage1CleanStage2RinseStage3Phos-phateStage4RinseStage5RinseDRAINDRAINDRAINDRAINabcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation金属处理DwellTime:Eachstagedependson:各阶段所需的时间，受下面的因素控制•Theamountofpretreatmentchemicaldissolvedinwater•溶于水的前处理化学药品的浓度•Theageofthechemical•化学药品的有效时间Regularcheckingisrequiredtogiveconsistentgoodresults–atleasttwicepershift.通常要经常检查前处理的状态—一个班至少两次abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPreparation–ZincPhosphate金属处理–磷酸锌Typical5StageSystem典型5步骤流程MetalSubstrateSteel–PhosphatisingSystem金属基材NoneFerrous–CleanandEtchStagetimeduration1–90seconds不同步骤所需的时间2–45seconds3–60seconds4–30seconds5–30secondsStagetemperature温度40–60oCDrying干燥温度100–120oCTypicalconcentration典型浓度2–4%byvolumeTypicalacidity1=alkaline酸碱性2=acidicTypicalcoatingweight40–70mg/ft.典型的膜重abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPretreatment-BS3189Type3SprayPhosphatePlant9stagepretreatment九步法Degrease脱脂Rinse水洗Rinse水洗Rinse水洗AcidEtch(phosphoricacid)表调ZincPhosphate磷酸锌磷化Rinse水洗Rinse水洗De-ionisedwater去离子水水洗Dry干燥QualityStandardBS6497参考英国标准BS6497abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPretreatment–QualityControl金属前处理–质量控制TitrationChecks:检测项目：1.Cleaner2.Rinses3.AcidConcentration4.Rinse5.PhosphateConcentrationandcoatingweight7.Rinse8.ObservationsCheckedatregularintervalsduringnormalproductionandbeforeproductioncommences以上项目应在生产过程中定时和生产前进行检验abcdDONGGUANJOINSHOWPRECISIONHARDWAREMANUFACTURINGCO.，LTDMetalPretreatmentDry金属前处理干燥T