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1、金属表面处理工艺（Metalsurfacetreatmentprocess）SurfaceblackeningtreatmentprocessSurfaceblackeningofsteelpartsprocessing,alsoknownasbarffing.Blacktreatmentnowcommonlyusedmethodshavethetraditionalalkalineheatingandblackeningofthelateappearanceoftwokindsofroomtemperature.Bu
2、ttheblackeningprocessatroomtemperatureisnotverygoodforlowcarbonsteel.A3steelisslightlybetterbyalkalineblackening.Alkalineblackfractionizecomesout,haveagainblackandtwoblackdistinction.Themaincomponentsoftheblackliquoraresodiumhydroxideandsodiumnitrite.Whenyou'reb
3、lack,youneedagoodtoleranceoftemperature.Youcangetanicesurfacebetween135and155degreesCelsius,butittakesonlyalittletime.Intheactualoperation,theneedtopayattentiontoistheworkpiecebeforeblackeningandrustremovingoilquality,andblackeningafterpassivationofimmersion.Bla
4、ckeningqualityisoftenduetotheseprocessesandchange."Blue"liquidmetalUsingalkalineoxidationoracidoxidation;toformalayerofoxidefilmonmetalsurfacetopreventmetalsurfacecorrosion,thisprocessiscalled"blue".Theblackmetalsurfacebythe"blue"treatmentaftertheformationoftheo
5、xidefilm,theouterlayerismainlymagnetite,theinnerlayerisfeo.A"blue",alkalineoxidationliquid1.formula:50~100gramsofsodiumhydroxideandsodiumnitratefrom600to700gramsofsodiumnitrate100~200grams1000gramsofwater2.systemmethod:accordingtotheformulaaftermeasuring,inthemi
6、xingconditions,inturneachmaterialtoadd,dissolve,mixevenly.3.instructions:(1)themetalsurfacemustbecleanedanddriedbeforethebasketcanbeprocessed.(2)metaldevices"blue"todealwiththerelevantconditionandthemetalcarbonamount,"and"thesolutiontemperatureandthemetalcompone
7、ntcanrefertothefollowingtableintheprocessingtime.Thecarboncontentofmetals,%operatingtemperature(DEGC),andprocessingtime(minutes)begintoterminate>0.7135137~14310-300.5-0.7135140~15030-50<0.4142145~15340-60Alloysteel142/145~153/15560-90(3)analyzethecontentofsodium
8、nitrate,sodiumnitriteandsodiumhydroxideinthesolutionregularlyeveryotherweek,soastosupplementtheingredientsintime.Generallyusesixmonthslater,youshouldreplaceallthesolu
